diff --git a/src/Fetch.js b/src/Fetch.js
index 29403dc3e0c19..e50db51512e17 100644
--- a/src/Fetch.js
+++ b/src/Fetch.js
@@ -71,7 +71,7 @@ var Fetch = {
 #endif // ~FETCH_SUPPORT_INDEXEDDB
 
 #if FETCH_SUPPORT_INDEXEDDB
-    if (typeof ENVIRONMENT_IS_FETCH_WORKER === 'undefined' || !ENVIRONMENT_IS_FETCH_WORKER) addRunDependency('library_fetch_init');
+    if (typeof ENVIRONMENT_IS_FETCH_WORKER == 'undefined' || !ENVIRONMENT_IS_FETCH_WORKER) addRunDependency('library_fetch_init');
 #endif
   }
 }
diff --git a/src/IDBStore.js b/src/IDBStore.js
index 10891c2463879..e720bd642ce33 100644
--- a/src/IDBStore.js
+++ b/src/IDBStore.js
@@ -6,9 +6,9 @@
 
 {
   indexedDB: function() {
-    if (typeof indexedDB !== 'undefined') return indexedDB;
+    if (typeof indexedDB != 'undefined') return indexedDB;
     var ret = null;
-    if (typeof window === 'object') ret = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
+    if (typeof window == 'object') ret = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
     assert(ret, 'IDBStore used, but indexedDB not supported');
     return ret;
   },
diff --git a/src/base64Decode.js b/src/base64Decode.js
index 4512aeeeb00ef..46a15327d619e 100644
--- a/src/base64Decode.js
+++ b/src/base64Decode.js
@@ -37,7 +37,7 @@ base64ReverseLookup[47] = 63; // '/'
 /** @noinline */
 function base64Decode(b64) {
 #if ENVIRONMENT_MAY_BE_NODE
-  if (typeof ENVIRONMENT_IS_NODE !== 'undefined' && ENVIRONMENT_IS_NODE) {
+  if (typeof ENVIRONMENT_IS_NODE != 'undefined' && ENVIRONMENT_IS_NODE) {
     var buf = Buffer.from(b64, 'base64');
     return new Uint8Array(buf.buffer, buf.byteOffset, buf.byteLength);
   }
diff --git a/src/base64Utils.js b/src/base64Utils.js
index b5105c3afc5d3..9fea5f8df1898 100644
--- a/src/base64Utils.js
+++ b/src/base64Utils.js
@@ -8,7 +8,7 @@
  * Decodes a base64 string.
  * @param {string} input The string to decode.
  */
-var decodeBase64 = typeof atob === 'function' ? atob : function (input) {
+var decodeBase64 = typeof atob == 'function' ? atob : function (input) {
   var keyStr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
 
   var output = '';
@@ -43,7 +43,7 @@ var decodeBase64 = typeof atob === 'function' ? atob : function (input) {
 // Throws error on invalid input.
 function intArrayFromBase64(s) {
 #if ENVIRONMENT_MAY_BE_NODE
-  if (typeof ENVIRONMENT_IS_NODE === 'boolean' && ENVIRONMENT_IS_NODE) {
+  if (typeof ENVIRONMENT_IS_NODE == 'boolean' && ENVIRONMENT_IS_NODE) {
     var buf = Buffer.from(s, 'base64');
     return new Uint8Array(buf['buffer'], buf['byteOffset'], buf['byteLength']);
   }
diff --git a/src/cpuprofiler.js b/src/cpuprofiler.js
index cfc508562b4fe..ca2b896332ce8 100644
--- a/src/cpuprofiler.js
+++ b/src/cpuprofiler.js
@@ -533,7 +533,7 @@ var emscriptenCpuProfiler = {
 
   detectWebGLContext: function() {
     if (Module['canvas'] && Module['canvas'].GLctxObject && Module['canvas'].GLctxObject.GLctx) return Module['canvas'].GLctxObject.GLctx;
-    else if (typeof GLctx !== 'undefined') return GLctx;
+    else if (typeof GLctx != 'undefined') return GLctx;
     else if (Module.ctx) return Module.ctx;
     return null;
   },
@@ -570,7 +570,7 @@ var emscriptenCpuProfiler = {
     document.getElementById("toggle_webgl_profile").style.background = '#E1E1E1';
 
     for (var f in glCtx) {
-      if (typeof glCtx[f] !== 'function' || f.startsWith('real_')) continue;
+      if (typeof glCtx[f] != 'function' || f.startsWith('real_')) continue;
       var realf = 'real_' + f;
       glCtx[f] = glCtx[realf];
       delete glCtx[realf];
@@ -603,8 +603,8 @@ var emscriptenCpuProfiler = {
   hookWebGL: function(glCtx) {
     if (!glCtx) glCtx = this.detectWebGLContext();
     if (!glCtx) return;
-    if (!((typeof WebGLRenderingContext !== 'undefined' && glCtx instanceof WebGLRenderingContext)
-     || (typeof WebGL2RenderingContext !== 'undefined' && glCtx instanceof WebGL2RenderingContext))) {
+    if (!((typeof WebGLRenderingContext != 'undefined' && glCtx instanceof WebGLRenderingContext)
+     || (typeof WebGL2RenderingContext != 'undefined' && glCtx instanceof WebGL2RenderingContext))) {
       document.getElementById("toggle_webgl_profile").disabled = true;
       return;
     }
@@ -619,7 +619,7 @@ var emscriptenCpuProfiler = {
     this.createSection(0, 'Hot GL', this.colorHotGLFunction, /*traceable=*/true);
     this.createSection(1, 'Cold GL', this.colorColdGLFunction, /*traceable=*/true);
     for (var f in glCtx) {
-      if (typeof glCtx[f] !== 'function' || f.startsWith('real_')) continue;
+      if (typeof glCtx[f] != 'function' || f.startsWith('real_')) continue;
       this.hookWebGLFunction(f, glCtx);
     }
     // The above injection won't work for texImage2D and texSubImage2D, which have multiple overloads.
@@ -671,4 +671,4 @@ setTimeout = (fn, delay) => {
 // Backwards compatibility with previously compiled code. Don't call this anymore!
 function cpuprofiler_add_hooks() { emscriptenCpuProfiler.initialize(); }
 
-if (typeof Module !== 'undefined' && typeof document !== 'undefined') emscriptenCpuProfiler.initialize();
+if (typeof Module != 'undefined' && typeof document != 'undefined') emscriptenCpuProfiler.initialize();
diff --git a/src/deterministic.js b/src/deterministic.js
index 4546cd10dbf4e..0b894b4ac540b 100644
--- a/src/deterministic.js
+++ b/src/deterministic.js
@@ -11,7 +11,7 @@ Math.random = () => {
 };
 var TIME = 10000;
 Date.now = () => TIME++;
-if (typeof performance === 'object') performance.now = Date.now;
+if (typeof performance == 'object') performance.now = Date.now;
 if (ENVIRONMENT_IS_NODE) process['hrtime'] = Date.now;
 
 if (!Module) Module = {};
diff --git a/src/embind/embind.js b/src/embind/embind.js
index f37da92c9931d..18b505add9955 100644
--- a/src/embind/embind.js
+++ b/src/embind/embind.js
@@ -568,7 +568,7 @@ var LibraryEmbind = {
     var isUnsignedType = (name.includes('unsigned'));
     var checkAssertions = (value, toTypeName) => {
 #if ASSERTIONS
-        if (typeof value !== "number" && typeof value !== "boolean") {
+        if (typeof value != "number" && typeof value != "boolean") {
             throw new TypeError('Cannot convert "' + _embind_repr(value) + '" to ' + toTypeName);
         }
         if (value < minRange || value > maxRange) {
@@ -622,7 +622,7 @@ var LibraryEmbind = {
             return value;
         },
         'toWireType': function (destructors, value) {
-            if (typeof value !== "bigint") {
+            if (typeof value != "bigint") {
                 throw new TypeError('Cannot convert "' + _embind_repr(value) + '" to ' + this.name);
             }
             if (value < minRange || value > maxRange) {
@@ -653,7 +653,7 @@ var LibraryEmbind = {
         },
         'toWireType': function(destructors, value) {
 #if ASSERTIONS
-            if (typeof value !== "number" && typeof value !== "boolean") {
+            if (typeof value != "number" && typeof value != "boolean") {
                 throw new TypeError('Cannot convert "' + _embind_repr(value) + '" to ' + this.name);
             }
 #endif
@@ -726,7 +726,7 @@ var LibraryEmbind = {
             }
 
             var getLength;
-            var valueIsOfTypeString = (typeof value === 'string');
+            var valueIsOfTypeString = (typeof value == 'string');
 
             if (!(valueIsOfTypeString || value instanceof Uint8Array || value instanceof Uint8ClampedArray || value instanceof Int8Array)) {
                 throwBindingError('Cannot pass non-string to std::string');
@@ -827,7 +827,7 @@ var LibraryEmbind = {
             return str;
         },
         'toWireType': function(destructors, value) {
-            if (!(typeof value === 'string')) {
+            if (!(typeof value == 'string')) {
                 throwBindingError('Cannot pass non-string to C++ string type ' + name);
             }
 
@@ -1175,7 +1175,7 @@ var LibraryEmbind = {
     }
 
     var fp = makeDynCaller();
-    if (typeof fp !== "function") {
+    if (typeof fp != "function") {
         throwBindingError("unknown function pointer with signature " + signature + ": " + rawFunction);
     }
     return fp;
diff --git a/src/embind/emval.js b/src/embind/emval.js
index a9ded70b3fe5b..f286fac5dab6a 100644
--- a/src/embind/emval.js
+++ b/src/embind/emval.js
@@ -209,26 +209,26 @@ var LibraryEmVal = {
 
 #if DYNAMIC_EXECUTION == 0
   $emval_get_global: function() {
-    if (typeof globalThis === 'object') {
+    if (typeof globalThis == 'object') {
       return globalThis;
     }
     function testGlobal(obj) {
       obj['$$$embind_global$$$'] = obj;
-      var success = typeof $$$embind_global$$$ === 'object' && obj['$$$embind_global$$$'] === obj;
+      var success = typeof $$$embind_global$$$ == 'object' && obj['$$$embind_global$$$'] == obj;
       if (!success) {
         delete obj['$$$embind_global$$$'];
       }
       return success;
     }
-    if (typeof $$$embind_global$$$ === 'object') {
+    if (typeof $$$embind_global$$$ == 'object') {
       return $$$embind_global$$$;
     }
-    if (typeof global === 'object' && testGlobal(global)) {
+    if (typeof global == 'object' && testGlobal(global)) {
       $$$embind_global$$$ = global;
-    } else if (typeof self === 'object' && testGlobal(self)) {
+    } else if (typeof self == 'object' && testGlobal(self)) {
       $$$embind_global$$$ = self; // This works for both "window" and "self" (Web Workers) global objects
     }
-    if (typeof $$$embind_global$$$ === 'object') {
+    if (typeof $$$embind_global$$$ == 'object') {
       return $$$embind_global$$$;
     }
     throw Error('unable to get global object.');
@@ -236,7 +236,7 @@ var LibraryEmVal = {
 #else
   // appease jshint (technically this code uses eval)
   $emval_get_global: function() {
-    if (typeof globalThis === 'object') {
+    if (typeof globalThis == 'object') {
       return globalThis;
     }
     return (function(){
@@ -491,13 +491,13 @@ var LibraryEmVal = {
   _emval_is_number__deps: ['$Emval'],
   _emval_is_number: function(handle) {
     handle = Emval.toValue(handle);
-    return typeof handle === 'number';
+    return typeof handle == 'number';
   },
 
   _emval_is_string__deps: ['$Emval'],
   _emval_is_string: function(handle) {
     handle = Emval.toValue(handle);
-    return typeof handle === 'string';
+    return typeof handle == 'string';
   },
 
   _emval_in__deps: ['$Emval'],
diff --git a/src/emrun_postjs.js b/src/emrun_postjs.js
index f7e6c059f8bf7..59e124631d868 100644
--- a/src/emrun_postjs.js
+++ b/src/emrun_postjs.js
@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: MIT
  */
 
-if (typeof window === "object" && (typeof ENVIRONMENT_IS_PTHREAD === 'undefined' || !ENVIRONMENT_IS_PTHREAD)) {
+if (typeof window == "object" && (typeof ENVIRONMENT_IS_PTHREAD == 'undefined' || !ENVIRONMENT_IS_PTHREAD)) {
   var emrun_register_handlers = function() {
     // When C code exit()s, we may still have remaining stdout and stderr messages in flight. In that case, we can't close
     // the browser until all those XHRs have finished, so the following state variables track that all communication is done,
@@ -66,5 +66,5 @@ if (typeof window === "object" && (typeof ENVIRONMENT_IS_PTHREAD === 'undefined'
     http.send(data); // XXX  this does not work in workers, for some odd reason (issue #2681)
   };
 
-  if (typeof Module !== 'undefined' && typeof document !== 'undefined') emrun_register_handlers();
+  if (typeof Module != 'undefined' && typeof document != 'undefined') emrun_register_handlers();
 }
diff --git a/src/emrun_prejs.js b/src/emrun_prejs.js
index c4b0aee4bbb41..3bb39fcfbd881 100644
--- a/src/emrun_prejs.js
+++ b/src/emrun_prejs.js
@@ -5,7 +5,7 @@
  */
 
 // Route URL GET parameters to argc+argv
-if (typeof window === 'object') {
+if (typeof window == 'object') {
   Module['arguments'] = window.location.search.substr(1).trim().split('&');
   // If no args were passed arguments = [''], in which case kill the single empty string.
   if (!Module['arguments'][0]) {
diff --git a/src/headless.js b/src/headless.js
index 6e3c066bd898d..33f643937ec71 100644
--- a/src/headless.js
+++ b/src/headless.js
@@ -287,7 +287,7 @@ var screen = { // XXX these values may need to be adjusted
   availWidth: 2100,
   availHeight: 1283,
 };
-if (typeof console === "undefined") {
+if (typeof console == "undefined") {
   console = {
     log: function(x) {
       print(x);
diff --git a/src/jsifier.js b/src/jsifier.js
index dca06f1f7b221..eaf1ffdab71e4 100644
--- a/src/jsifier.js
+++ b/src/jsifier.js
@@ -40,8 +40,8 @@ function escapeJSONKey(x) {
 }
 
 function stringifyWithFunctions(obj) {
-  if (typeof obj === 'function') return obj.toString();
-  if (obj === null || typeof obj !== 'object') return JSON.stringify(obj);
+  if (typeof obj == 'function') return obj.toString();
+  if (obj === null || typeof obj != 'object') return JSON.stringify(obj);
   if (Array.isArray(obj)) {
     return '[' + obj.map(stringifyWithFunctions).join(',') + ']';
   } else {
@@ -106,7 +106,7 @@ function ${name}(${args}) {
   var ret = (function() { if (runtimeDebug) err("[library call:${finalName}: " + Array.prototype.slice.call(arguments).map(prettyPrint) + "]");
   ${body}
   }).apply(this, arguments);
-  if (runtimeDebug && typeof ret !== "undefined") err("  [     return:" + prettyPrint(ret));
+  if (runtimeDebug && typeof ret != "undefined") err("  [     return:" + prettyPrint(ret));
   return ret;
 }`);
     }
@@ -203,7 +203,7 @@ function ${name}(${args}) {
       }
       const isUserSymbol = LibraryManager.library[ident + '__user'];
       deps.forEach((dep) => {
-        if (typeof snippet === 'string' && !(dep in LibraryManager.library)) {
+        if (typeof snippet == 'string' && !(dep in LibraryManager.library)) {
           warn(`missing library dependency ${dep}, make sure you are compiling with the right options (see #if in src/library*.js)`);
         }
         if (isUserSymbol && LibraryManager.library[dep + '__internal']) {
@@ -212,7 +212,7 @@ function ${name}(${args}) {
       });
       let isFunction = false;
 
-      if (typeof snippet === 'string') {
+      if (typeof snippet == 'string') {
         if (snippet[0] != '=') {
           const target = LibraryManager.library[snippet];
           if (target) {
@@ -228,9 +228,9 @@ function ${name}(${args}) {
             libraryFunctions.push(finalName);
           }
         }
-      } else if (typeof snippet === 'object') {
+      } else if (typeof snippet == 'object') {
         snippet = stringifyWithFunctions(snippet);
-      } else if (typeof snippet === 'function') {
+      } else if (typeof snippet == 'function') {
         isFunction = true;
         snippet = processLibraryFunction(snippet, ident, finalName);
         libraryFunctions.push(finalName);
@@ -251,7 +251,7 @@ function ${name}(${args}) {
       if (postset) {
         // A postset is either code to run right now, or some text we should emit.
         // If it's code, it may return some text to emit as well.
-        if (typeof postset === 'function') {
+        if (typeof postset == 'function') {
           postset = postset();
         }
         if (postset && !addedLibraryItems[postsetId]) {
@@ -270,7 +270,7 @@ function ${name}(${args}) {
       }
       const identDependents = ident + "__deps: ['" + deps.join("','") + "']";
       function addDependency(dep) {
-        if (typeof dep !== 'function') {
+        if (typeof dep != 'function') {
           dep = {identOrig: dep, identMangled: mangleCSymbolName(dep)};
         }
         return addFromLibrary(dep, `${identDependents}, referenced by ${dependent}`);
@@ -284,7 +284,7 @@ function ${name}(${args}) {
             throw new Error(`Invalid proxyingMode ${ident}__proxy: '${proxyingMode}' specified!`);
           }
           const sync = proxyingMode === 'sync';
-          assert(typeof original === 'function');
+          assert(typeof original == 'function');
           contentText = modifyFunction(snippet, (name, args, body) => `
 function ${name}(${args}) {
   if (ENVIRONMENT_IS_PTHREAD)
@@ -303,7 +303,7 @@ function ${name}(${args}) {
         } else {
           contentText = snippet; // Regular JS function that will be executed in the context of the calling thread.
         }
-      } else if (typeof snippet === 'string' && snippet.startsWith(';')) {
+      } else if (typeof snippet == 'string' && snippet.startsWith(';')) {
         // In JS libraries
         //   foo: ';[code here verbatim]'
         //  emits
@@ -315,7 +315,7 @@ function ${name}(${args}) {
         //   foo: '=[value]'
         //  emits
         //   'var foo = [value];'
-        if (typeof snippet === 'string' && snippet[0] == '=') snippet = snippet.substr(1);
+        if (typeof snippet == 'string' && snippet[0] == '=') snippet = snippet.substr(1);
         contentText = `var ${finalName} = ${snippet};`;
       }
       const sig = LibraryManager.library[ident + '__sig'];
diff --git a/src/library.js b/src/library.js
index 183d2d62d4f12..d6088f68c7c02 100644
--- a/src/library.js
+++ b/src/library.js
@@ -126,7 +126,7 @@ LibraryManager.library = {
       wasmMemory.grow((size - buffer.byteLength + 65535) >>> 16); // .grow() takes a delta compared to the previous size
       updateGlobalBufferAndViews(wasmMemory.buffer);
 #if MEMORYPROFILER
-      if (typeof emscriptenMemoryProfiler !== 'undefined') {
+      if (typeof emscriptenMemoryProfiler != 'undefined') {
         emscriptenMemoryProfiler.onMemoryResize(oldHeapSize, buffer.byteLength);
       }
 #endif
@@ -729,7 +729,7 @@ LibraryManager.library = {
     var MONTHS = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
 
     function leadingSomething(value, digits, character) {
-      var str = typeof value === 'number' ? value.toString() : (value || '');
+      var str = typeof value == 'number' ? value.toString() : (value || '');
       while (str.length < digits) {
         str = character[0]+str;
       }
@@ -1074,7 +1074,7 @@ LibraryManager.library = {
 
     function initDate() {
       function fixup(value, min, max) {
-        return (typeof value !== 'number' || isNaN(value)) ? min : (value>=min ? (value<=max ? value: max): min);
+        return (typeof value != 'number' || isNaN(value)) ? min : (value>=min ? (value<=max ? value: max): min);
       };
       return {
         year: fixup({{{ makeGetValue('tm', C_STRUCTS.tm.tm_year, 'i32', 0, 0, 1) }}} + 1900 , 1970, 9999),
@@ -1667,7 +1667,7 @@ LibraryManager.library = {
 
     offset = 0; z = 0;
     for (w=0; w < words.length; w++) {
-      if (typeof words[w] === 'string') {
+      if (typeof words[w] == 'string') {
         if (words[w] === 'Z') {
           // compressed zeros - write appropriate number of zero words
           for (z = 0; z < (8 - words.length+1); z++) {
@@ -2306,7 +2306,7 @@ LibraryManager.library = {
   // TODO: consider allowing the API to get a parameter for the number of
   // bytes.
   $getRandomDevice: function() {
-    if (typeof crypto === 'object' && typeof crypto['getRandomValues'] === 'function') {
+    if (typeof crypto == 'object' && typeof crypto['getRandomValues'] == 'function') {
       // for modern web browsers
       var randomBuffer = new Uint8Array(1);
       return function() { crypto.getRandomValues(randomBuffer); return randomBuffer[0]; };
@@ -2415,12 +2415,12 @@ LibraryManager.library = {
                                "} else " +
 #endif
 #if ENVIRONMENT_MAY_BE_SHELL
-                               "if (typeof dateNow !== 'undefined') {\n" +
+                               "if (typeof dateNow != 'undefined') {\n" +
                                "  _emscripten_get_now = dateNow;\n" +
                                "} else " +
 #endif
 #if MIN_IE_VERSION <= 9 || MIN_FIREFOX_VERSION <= 14 || MIN_CHROME_VERSION <= 23 || MIN_SAFARI_VERSION <= 80400 // https://caniuse.com/#feat=high-resolution-time
-                               "if (typeof performance !== 'undefined' && performance.now) {\n" +
+                               "if (typeof performance != 'undefined' && performance.now) {\n" +
                                "  _emscripten_get_now = () => performance.now();\n" +
                                "} else {\n" +
                                "  _emscripten_get_now = Date.now;\n" +
@@ -2438,12 +2438,12 @@ LibraryManager.library = {
     } else
 #endif
 #if ENVIRONMENT_MAY_BE_SHELL
-    if (typeof dateNow !== 'undefined') {
+    if (typeof dateNow != 'undefined') {
       return 1000; // microseconds (1/1000 of a millisecond)
     } else
 #endif
 #if MIN_IE_VERSION <= 9 || MIN_FIREFOX_VERSION <= 14 || MIN_CHROME_VERSION <= 23 || MIN_SAFARI_VERSION <= 80400 // https://caniuse.com/#feat=high-resolution-time
-    if (typeof performance === 'object' && performance && typeof performance['now'] === 'function') {
+    if (typeof performance == 'object' && performance && typeof performance['now'] == 'function') {
       return 1000; // microseconds (1/1000 of a millisecond)
     } else {
       return 1000*1000; // milliseconds
@@ -2458,12 +2458,12 @@ LibraryManager.library = {
   // implementation is not :(
 #if MIN_IE_VERSION <= 9 || MIN_FIREFOX_VERSION <= 14 || MIN_CHROME_VERSION <= 23 || MIN_SAFARI_VERSION <= 80400 // https://caniuse.com/#feat=high-resolution-time
   emscripten_get_now_is_monotonic: `
-     ((typeof performance === 'object' && performance && typeof performance['now'] === 'function')
+     ((typeof performance == 'object' && performance && typeof performance['now'] == 'function')
 #if ENVIRONMENT_MAY_BE_NODE
       || ENVIRONMENT_IS_NODE
 #endif
 #if ENVIRONMENT_MAY_BE_SHELL
-      || (typeof dateNow !== 'undefined')
+      || (typeof dateNow != 'undefined')
 #endif
     );`,
 #else
@@ -2497,7 +2497,7 @@ LibraryManager.library = {
         str += ", ";
       }
       first = false;
-      if (typeof a === 'number' || typeof a === 'string') {
+      if (typeof a == 'number' || typeof a == 'string') {
         str += a;
       } else {
         str += '(' + typeof a + ')';
@@ -2531,7 +2531,7 @@ LibraryManager.library = {
     }
 
     // If user requested to see the original source stack, but no source map information is available, just fall back to showing the JS stack.
-    if (flags & {{{ cDefine('EM_LOG_C_STACK') }}} && typeof emscripten_source_map === 'undefined') {
+    if (flags & {{{ cDefine('EM_LOG_C_STACK') }}} && typeof emscripten_source_map == 'undefined') {
       warnOnce('Source map information is not available, emscripten_log with EM_LOG_C_STACK will be ignored. Build with "--pre-js $EMSCRIPTEN/src/emscripten-source-map.min.js" linker flag to add source map loading to code.');
       flags ^= {{{ cDefine('EM_LOG_C_STACK') }}};
       flags |= {{{ cDefine('EM_LOG_JS_STACK') }}};
@@ -2669,7 +2669,7 @@ LibraryManager.library = {
     name = UTF8ToString(name);
 
     var ret = getCompilerSetting(name);
-    if (typeof ret === 'number') return ret;
+    if (typeof ret == 'number') return ret;
 
     if (!_emscripten_get_compiler_setting.cache) _emscripten_get_compiler_setting.cache = {};
     var cache = _emscripten_get_compiler_setting.cache;
@@ -2945,9 +2945,9 @@ LibraryManager.library = {
                             ],
   $withBuiltinMalloc__docs: '/** @suppress{checkTypes} */',
   $withBuiltinMalloc: function (func) {
-    var prev_malloc = typeof _malloc !== 'undefined' ? _malloc : undefined;
-    var prev_memalign = typeof _memalign !== 'undefined' ? _memalign : undefined;
-    var prev_free = typeof _free !== 'undefined' ? _free : undefined;
+    var prev_malloc = typeof _malloc != 'undefined' ? _malloc : undefined;
+    var prev_memalign = typeof _memalign != 'undefined' ? _memalign : undefined;
+    var prev_free = typeof _free != 'undefined' ? _free : undefined;
     _malloc = _emscripten_builtin_malloc;
     _memalign = _emscripten_builtin_memalign;
     _free = _emscripten_builtin_free;
@@ -3060,7 +3060,7 @@ LibraryManager.library = {
   $exportAsmFunctions__deps: ['$asmjsMangle'],
   $exportAsmFunctions: function(asm) {
 #if ENVIRONMENT_MAY_BE_NODE && ENVIRONMENT_MAY_BE_WEB
-    var global_object = (typeof process !== "undefined" ? global : this);
+    var global_object = (typeof process != "undefined" ? global : this);
 #elif ENVIRONMENT_MAY_BE_NODE
     var global_object = global;
 #else
@@ -3213,7 +3213,7 @@ LibraryManager.library = {
   $dynCallLegacy: function(sig, ptr, args) {
 #if ASSERTIONS
 #if MINIMAL_RUNTIME
-    assert(typeof dynCalls !== 'undefined', 'Global dynCalls dictionary was not generated in the build! Pass -s DEFAULT_LIBRARY_FUNCS_TO_INCLUDE=["$dynCall"] linker flag to include it!');
+    assert(typeof dynCalls != 'undefined', 'Global dynCalls dictionary was not generated in the build! Pass -s DEFAULT_LIBRARY_FUNCS_TO_INCLUDE=["$dynCall"] linker flag to include it!');
     assert(sig in dynCalls, 'bad function pointer type - no table for sig \'' + sig + '\'');
 #else
     assert(('dynCall_' + sig) in Module, 'bad function pointer type - no table for sig \'' + sig + '\'');
@@ -3280,7 +3280,7 @@ LibraryManager.library = {
         continue;
       }
       var func = callback.func;
-      if (typeof func === 'number') {
+      if (typeof func == 'number') {
         if (callback.arg === undefined) {
           {{{ makeDynCall('v', 'func') }}}();
         } else {
@@ -3365,7 +3365,7 @@ LibraryManager.library = {
   _emscripten_out__sig: 'vi',
   _emscripten_out: function(str) {
 #if ASSERTIONS
-    assert(typeof str === 'number');
+    assert(typeof str == 'number');
 #endif
     out(UTF8ToString(str));
   },
@@ -3373,7 +3373,7 @@ LibraryManager.library = {
   _emscripten_err__sig: 'vi',
   _emscripten_err: function(str) {
 #if ASSERTIONS
-    assert(typeof str === 'number');
+    assert(typeof str == 'number');
 #endif
     err(UTF8ToString(str));
   },
@@ -3384,8 +3384,8 @@ LibraryManager.library = {
   _emscripten_get_progname: function(str, len) {
   #if !MINIMAL_RUNTIME
   #if ASSERTIONS
-    assert(typeof str === 'number');
-    assert(typeof len === 'number');
+    assert(typeof str == 'number');
+    assert(typeof len == 'number');
   #endif
     stringToUTF8(thisProgram, str, len);
   #endif
@@ -3394,7 +3394,7 @@ LibraryManager.library = {
   emscripten_console_log__sig: 'vi',
   emscripten_console_log: function(str) {
 #if ASSERTIONS
-    assert(typeof str === 'number');
+    assert(typeof str == 'number');
 #endif
     console.log(UTF8ToString(str));
   },
@@ -3402,7 +3402,7 @@ LibraryManager.library = {
   emscripten_console_warn__sig: 'vi',
   emscripten_console_warn: function(str) {
 #if ASSERTIONS
-    assert(typeof str === 'number');
+    assert(typeof str == 'number');
 #endif
     console.warn(UTF8ToString(str));
   },
@@ -3410,7 +3410,7 @@ LibraryManager.library = {
   emscripten_console_error__sig: 'vi',
   emscripten_console_error: function(str) {
 #if ASSERTIONS
-    assert(typeof str === 'number');
+    assert(typeof str == 'number');
 #endif
     console.error(UTF8ToString(str));
   },
@@ -3421,7 +3421,7 @@ LibraryManager.library = {
 
   emscripten_throw_string: function(str) {
 #if ASSERTIONS
-    assert(typeof str === 'number');
+    assert(typeof str == 'number');
 #endif
     throw UTF8ToString(str);
   },
diff --git a/src/library_async.js b/src/library_async.js
index 35be0371107c5..da09a1ae2d80f 100644
--- a/src/library_async.js
+++ b/src/library_async.js
@@ -66,7 +66,7 @@ mergeInto(LibraryManager.library, {
       for (var x in imports) {
         (function(x) {
           var original = imports[x];
-          if (typeof original === 'function') {
+          if (typeof original == 'function') {
             imports[x] = function() {
               var originalAsyncifyState = Asyncify.state;
               try {
@@ -111,7 +111,7 @@ mergeInto(LibraryManager.library, {
       for (var x in exports) {
         (function(x) {
           var original = exports[x];
-          if (typeof original === 'function') {
+          if (typeof original == 'function') {
             ret[x] = function() {
 #if ASYNCIFY_DEBUG >= 2
               err('ASYNCIFY: ' + '  '.repeat(Asyncify.exportCallStack.length) + ' try ' + x);
@@ -153,7 +153,7 @@ mergeInto(LibraryManager.library, {
         Asyncify.state = Asyncify.State.Normal;
         // Keep the runtime alive so that a re-wind can be done later.
         runAndAbortIfError(Module['_asyncify_stop_unwind']);
-        if (typeof Fibers !== 'undefined') {
+        if (typeof Fibers != 'undefined') {
           Fibers.trampoline();
         }
       }
@@ -236,7 +236,7 @@ mergeInto(LibraryManager.library, {
         var reachedAfterCallback = false;
         startAsync((handleSleepReturnValue) => {
 #if ASSERTIONS
-          assert(!handleSleepReturnValue || typeof handleSleepReturnValue === 'number' || typeof handleSleepReturnValue === 'boolean'); // old emterpretify API supported other stuff
+          assert(!handleSleepReturnValue || typeof handleSleepReturnValue == 'number' || typeof handleSleepReturnValue == 'boolean'); // old emterpretify API supported other stuff
 #endif
           if (ABORT) return;
           Asyncify.handleSleepReturnValue = handleSleepReturnValue || 0;
@@ -258,7 +258,7 @@ mergeInto(LibraryManager.library, {
 #endif
           Asyncify.state = Asyncify.State.Rewinding;
           runAndAbortIfError(() => Module['_asyncify_start_rewind'](Asyncify.currData));
-          if (typeof Browser !== 'undefined' && Browser.mainLoop.func) {
+          if (typeof Browser != 'undefined' && Browser.mainLoop.func) {
             Browser.mainLoop.resume();
           }
           var asyncWasmReturnValue, isError = false;
@@ -307,7 +307,7 @@ mergeInto(LibraryManager.library, {
           err('ASYNCIFY: start unwind ' + Asyncify.currData);
 #endif
           runAndAbortIfError(() => Module['_asyncify_start_unwind'](Asyncify.currData));
-          if (typeof Browser !== 'undefined' && Browser.mainLoop.func) {
+          if (typeof Browser != 'undefined' && Browser.mainLoop.func) {
             Browser.mainLoop.pause();
           }
         }
diff --git a/src/library_browser.js b/src/library_browser.js
index 88926c0f175d7..a9a410d8571f6 100644
--- a/src/library_browser.js
+++ b/src/library_browser.js
@@ -110,7 +110,7 @@ var LibraryBrowser = {
       }
       Browser.BlobBuilder = typeof MozBlobBuilder != "undefined" ? MozBlobBuilder : (typeof WebKitBlobBuilder != "undefined" ? WebKitBlobBuilder : (!Browser.hasBlobConstructor ? out("warning: no BlobBuilder") : null));
       Browser.URLObject = typeof window != "undefined" ? (window.URL ? window.URL : window.webkitURL) : undefined;
-      if (!Module.noImageDecoding && typeof Browser.URLObject === 'undefined') {
+      if (!Module.noImageDecoding && typeof Browser.URLObject == 'undefined') {
         out("warning: Browser does not support creating object URLs. Built-in browser image decoding will not be available.");
         Module.noImageDecoding = true;
       }
@@ -340,7 +340,7 @@ var LibraryBrowser = {
 #if MIN_WEBGL_VERSION >= 2
           majorVersion: 2,
 #elif MAX_WEBGL_VERSION >= 2 // library_browser.js defaults: use the WebGL version chosen at compile time (unless overridden below)
-          majorVersion: (typeof WebGL2RenderingContext !== 'undefined') ? 2 : 1,
+          majorVersion: (typeof WebGL2RenderingContext != 'undefined') ? 2 : 1,
 #else
           majorVersion: 1,
 #endif
@@ -355,7 +355,7 @@ var LibraryBrowser = {
         // This check of existence of GL is here to satisfy Closure compiler, which yells if variable GL is referenced below but GL object is not
         // actually compiled in because application is not doing any GL operations. TODO: Ideally if GL is not being used, this function
         // Browser.createContext() should not even be emitted.
-        if (typeof GL !== 'undefined') {
+        if (typeof GL != 'undefined') {
           contextHandle = GL.createContext(canvas, contextAttributes);
           if (contextHandle) {
             ctx = GL.getContext(contextHandle).GLctx;
@@ -368,7 +368,7 @@ var LibraryBrowser = {
       if (!ctx) return null;
 
       if (setInModule) {
-        if (!useWebGL) assert(typeof GLctx === 'undefined', 'cannot set in module if GLctx is used, but we are a non-GL context that would replace it');
+        if (!useWebGL) assert(typeof GLctx == 'undefined', 'cannot set in module if GLctx is used, but we are a non-GL context that would replace it');
 
         Module.ctx = ctx;
         if (useWebGL) GL.makeContextCurrent(contextHandle);
@@ -387,8 +387,8 @@ var LibraryBrowser = {
     requestFullscreen: function(lockPointer, resizeCanvas) {
       Browser.lockPointer = lockPointer;
       Browser.resizeCanvas = resizeCanvas;
-      if (typeof Browser.lockPointer === 'undefined') Browser.lockPointer = true;
-      if (typeof Browser.resizeCanvas === 'undefined') Browser.resizeCanvas = false;
+      if (typeof Browser.lockPointer == 'undefined') Browser.lockPointer = true;
+      if (typeof Browser.resizeCanvas == 'undefined') Browser.resizeCanvas = false;
 
       var canvas = Module['canvas'];
       function fullscreenChange() {
@@ -484,13 +484,13 @@ var LibraryBrowser = {
     },
 
     requestAnimationFrame: function(func) {
-      if (typeof requestAnimationFrame === 'function') {
+      if (typeof requestAnimationFrame == 'function') {
         requestAnimationFrame(func);
         return;
       }
       var RAF = Browser.fakeRequestAnimationFrame;
 #if LEGACY_VM_SUPPORT
-      if (typeof window !== 'undefined') {
+      if (typeof window != 'undefined') {
         RAF = window['requestAnimationFrame'] ||
               window['mozRequestAnimationFrame'] ||
               window['webkitRequestAnimationFrame'] ||
@@ -637,12 +637,12 @@ var LibraryBrowser = {
         // Neither .scrollX or .pageXOffset are defined in a spec, but
         // we prefer .scrollX because it is currently in a spec draft.
         // (see: http://www.w3.org/TR/2013/WD-cssom-view-20131217/)
-        var scrollX = ((typeof window.scrollX !== 'undefined') ? window.scrollX : window.pageXOffset);
-        var scrollY = ((typeof window.scrollY !== 'undefined') ? window.scrollY : window.pageYOffset);
+        var scrollX = ((typeof window.scrollX != 'undefined') ? window.scrollX : window.pageXOffset);
+        var scrollY = ((typeof window.scrollY != 'undefined') ? window.scrollY : window.pageYOffset);
 #if ASSERTIONS
         // If this assert lands, it's likely because the browser doesn't support scrollX or pageXOffset
         // and we have no viable fallback.
-        assert((typeof scrollX !== 'undefined') && (typeof scrollY !== 'undefined'), 'Unable to retrieve scroll position, mouse positions likely broken.');
+        assert((typeof scrollX != 'undefined') && (typeof scrollY != 'undefined'), 'Unable to retrieve scroll position, mouse positions likely broken.');
 #endif
 
         if (event.type === 'touchstart' || event.type === 'touchend' || event.type === 'touchmove') {
@@ -942,7 +942,7 @@ var LibraryBrowser = {
       };
       Browser.mainLoop.method = 'rAF';
     } else if (mode == 2 /*EM_TIMING_SETIMMEDIATE*/) {
-      if (typeof setImmediate === 'undefined') {
+      if (typeof setImmediate == 'undefined') {
         // Emulate setImmediate. (note: not a complete polyfill, we don't emulate clearImmediate() to keep code size to minimum, since not needed)
         var setImmediates = [];
         var emscriptenMainLoopMessageId = 'setimmediate';
@@ -1084,7 +1084,7 @@ var LibraryBrowser = {
 #if USE_PTHREADS && OFFSCREEN_FRAMEBUFFER && GL_SUPPORT_EXPLICIT_SWAP_CONTROL
       // If the current GL context is a proxied regular WebGL context, and was initialized with implicit swap mode on the main thread, and we are on the parent thread,
       // perform the swap on behalf of the user.
-      if (typeof GL !== 'undefined' && GL.currentContext && GL.currentContextIsProxied) {
+      if (typeof GL != 'undefined' && GL.currentContext && GL.currentContextIsProxied) {
         var explicitSwapControl = {{{ makeGetValue('GL.currentContext', 0, 'i32') }}};
         if (!explicitSwapControl) _emscripten_webgl_commit_frame();
       }
@@ -1092,7 +1092,7 @@ var LibraryBrowser = {
 
 #if OFFSCREENCANVAS_SUPPORT
       // If the current GL context is an OffscreenCanvas, but it was initialized with implicit swap mode, perform the swap on behalf of the user.
-      if (typeof GL !== 'undefined' && GL.currentContext && !GL.currentContextIsProxied && !GL.currentContext.attributes.explicitSwapControl && GL.currentContext.GLctx.commit) {
+      if (typeof GL != 'undefined' && GL.currentContext && !GL.currentContextIsProxied && !GL.currentContext.attributes.explicitSwapControl && GL.currentContext.GLctx.commit) {
         GL.currentContext.GLctx.commit();
       }
 #endif
@@ -1117,7 +1117,7 @@ var LibraryBrowser = {
       // to queue the newest produced audio samples.
       // TODO: Consider adding pre- and post- rAF callbacks so that GL.newRenderingFrameStarted() and SDL.audio.queueNewAudioData()
       //       do not need to be hardcoded into this function, but can be more generic.
-      if (typeof SDL === 'object' && SDL.audio && SDL.audio.queueNewAudioData) SDL.audio.queueNewAudioData();
+      if (typeof SDL == 'object' && SDL.audio && SDL.audio.queueNewAudioData) SDL.audio.queueNewAudioData();
 
       Browser.mainLoop.scheduler();
     }
diff --git a/src/library_c_preprocessor.js b/src/library_c_preprocessor.js
index d97b60f1ed52e..c0487b4dce5a4 100644
--- a/src/library_c_preprocessor.js
+++ b/src/library_c_preprocessor.js
@@ -150,7 +150,7 @@ mergeInto(LibraryManager.library, {
     function buildExprTree(tokens) {
       // Consume tokens array into a function tree until the tokens array is exhausted
       // to a single root node that evaluates it.
-      while(tokens.length > 1 || typeof(tokens[0]) != 'function') {
+      while (tokens.length > 1 || typeof tokens[0] != 'function') {
         tokens = (function(tokens) {
           // Find the index 'i' of the operator we should evaluate next:
           var i, j, p, operatorAndPriority = -2;
diff --git a/src/library_dylink.js b/src/library_dylink.js
index 5cc5ce0ed9348..929dda9ced024 100644
--- a/src/library_dylink.js
+++ b/src/library_dylink.js
@@ -102,14 +102,14 @@ var LibraryDylink = {
 #if DYLINK_DEBUG
         err("updateGOT: before: " + symName + ' : ' + GOT[symName].value);
 #endif
-        if (typeof value === 'function') {
+        if (typeof value == 'function') {
           GOT[symName].value = addFunction(value);
 #if DYLINK_DEBUG
           err("updateGOT: FUNC: " + symName + ' : ' + GOT[symName].value);
 #endif
-        } else if (typeof value === 'number') {
+        } else if (typeof value == 'number') {
           GOT[symName].value = value;
-        } else if (typeof value === 'bigint') {
+        } else if (typeof value == 'bigint') {
           GOT[symName].value = Number(value);
         } else {
           err("unhandled export type for `" + symName + "`: " + (typeof value));
@@ -145,12 +145,12 @@ var LibraryDylink = {
         continue;
       }
 #endif
-      if (typeof value === 'object') {
+      if (typeof value == 'object') {
         // a breaking change in the wasm spec, globals are now objects
         // https://github.com/WebAssembly/mutable-global/issues/1
         value = value.value;
       }
-      if (typeof value === 'number') {
+      if (typeof value == 'number') {
         value += memoryBase;
       }
       relocated[e] = value;
@@ -174,13 +174,13 @@ var LibraryDylink = {
 #if DYLINK_DEBUG
         err('assigning dynamic symbol from main module: ' + symName + ' -> ' + prettyPrint(value));
 #endif
-        if (typeof value === 'function') {
+        if (typeof value == 'function') {
           /** @suppress {checkTypes} */
           GOT[symName].value = addFunction(value, value.sig);
 #if DYLINK_DEBUG
           err('assigning table entry for : ' + symName + ' -> ' + GOT[symName].value);
 #endif
-        } else if (typeof value === 'number') {
+        } else if (typeof value == 'number') {
           GOT[symName].value = value;
         } else {
           throw new Error('bad export type for `' + symName + '`: ' + (typeof value));
@@ -415,7 +415,7 @@ var LibraryDylink = {
       else {
         var curr = asmLibraryArg[sym], next = exports[sym];
         // don't warn on functions - might be odr, linkonce_odr, etc.
-        if (!(typeof curr === 'function' && typeof next === 'function')) {
+        if (!(typeof curr == 'function' && typeof next == 'function')) {
           err("warning: symbol '" + sym + "' from '" + libName + "' already exists (duplicate symbol? or weak linking, which isn't supported yet?)"); // + [curr, ' vs ', next]);
         }
       }
@@ -947,7 +947,7 @@ var LibraryDylink = {
       result = lib.module[symbol];
     }
 
-    if (typeof result === 'function') {
+    if (typeof result == 'function') {
 #if DYLINK_DEBUG
       err('dlsym: ' + symbol + ' getting table slot for: ' + result);
 #endif
diff --git a/src/library_eventloop.js b/src/library_eventloop.js
index e66454daf5db9..8e65bb68087db 100644
--- a/src/library_eventloop.js
+++ b/src/library_eventloop.js
@@ -37,10 +37,10 @@ LibraryJSEventLoop = {
   $polyfillSetImmediate__postset:
     'var emSetImmediate;\n' +
     'var emClearImmediate;\n' +
-    'if (typeof setImmediate !== "undefined") {\n' +
+    'if (typeof setImmediate != "undefined") {\n' +
       'emSetImmediate = setImmediateWrapped;\n' +
       'emClearImmediate = clearImmediateWrapped;\n' +
-    '} else if (typeof addEventListener === "function") {\n' +
+    '} else if (typeof addEventListener == "function") {\n' +
       'var __setImmediate_id_counter = 0;\n' +
       'var __setImmediate_queue = [];\n' +
       'var __setImmediate_message_id = "_si";\n' +
diff --git a/src/library_fs.js b/src/library_fs.js
index 565d5518bd56d..bc5cc412cb2ae 100644
--- a/src/library_fs.js
+++ b/src/library_fs.js
@@ -249,7 +249,7 @@ FS.staticInit();` +
     },
     createNode: (parent, name, mode, rdev) => {
 #if ASSERTIONS
-      assert(typeof parent === 'object')
+      assert(typeof parent == 'object')
 #endif
       var node = new FS.FSNode(parent, name, mode, rdev);
 
@@ -305,7 +305,7 @@ FS.staticInit();` +
     // convert the 'r', 'r+', etc. to it's corresponding set of O_* flags
     modeStringToFlags: (str) => {
       var flags = FS.flagModes[str];
-      if (typeof flags === 'undefined') {
+      if (typeof flags == 'undefined') {
         throw new Error('Unknown file open mode: ' + str);
       }
       return flags;
@@ -481,7 +481,7 @@ FS.staticInit();` +
       return mounts;
     },
     syncfs: (populate, callback) => {
-      if (typeof(populate) === 'function') {
+      if (typeof populate == 'function') {
         callback = populate;
         populate = false;
       }
@@ -526,7 +526,7 @@ FS.staticInit();` +
     },
     mount: (type, opts, mountpoint) => {
 #if ASSERTIONS
-      if (typeof type === 'string') {
+      if (typeof type == 'string') {
         // The filesystem was not included, and instead we have an error
         // message stored in the variable.
         throw type;
@@ -668,7 +668,7 @@ FS.staticInit();` +
       }
     },
     mkdev: (path, mode, dev) => {
-      if (typeof(dev) === 'undefined') {
+      if (typeof dev == 'undefined') {
         dev = mode;
         mode = 438 /* 0666 */;
       }
@@ -888,7 +888,7 @@ FS.staticInit();` +
     },
     chmod: (path, mode, dontFollow) => {
       var node;
-      if (typeof path === 'string') {
+      if (typeof path == 'string') {
         var lookup = FS.lookupPath(path, { follow: !dontFollow });
         node = lookup.node;
       } else {
@@ -914,7 +914,7 @@ FS.staticInit();` +
     },
     chown: (path, uid, gid, dontFollow) => {
       var node;
-      if (typeof path === 'string') {
+      if (typeof path == 'string') {
         var lookup = FS.lookupPath(path, { follow: !dontFollow });
         node = lookup.node;
       } else {
@@ -943,7 +943,7 @@ FS.staticInit();` +
         throw new FS.ErrnoError({{{ cDefine('EINVAL') }}});
       }
       var node;
-      if (typeof path === 'string') {
+      if (typeof path == 'string') {
         var lookup = FS.lookupPath(path, { follow: true });
         node = lookup.node;
       } else {
@@ -988,15 +988,15 @@ FS.staticInit();` +
       if (path === "") {
         throw new FS.ErrnoError({{{ cDefine('ENOENT') }}});
       }
-      flags = typeof flags === 'string' ? FS.modeStringToFlags(flags) : flags;
-      mode = typeof mode === 'undefined' ? 438 /* 0666 */ : mode;
+      flags = typeof flags == 'string' ? FS.modeStringToFlags(flags) : flags;
+      mode = typeof mode == 'undefined' ? 438 /* 0666 */ : mode;
       if ((flags & {{{ cDefine('O_CREAT') }}})) {
         mode = (mode & {{{ cDefine('S_IALLUGO') }}}) | {{{ cDefine('S_IFREG') }}};
       } else {
         mode = 0;
       }
       var node;
-      if (typeof path === 'object') {
+      if (typeof path == 'object') {
         node = path;
       } else {
         path = PATH.normalize(path);
@@ -1147,7 +1147,7 @@ FS.staticInit();` +
       if (!stream.stream_ops.read) {
         throw new FS.ErrnoError({{{ cDefine('EINVAL') }}});
       }
-      var seeking = typeof position !== 'undefined';
+      var seeking = typeof position != 'undefined';
       if (!seeking) {
         position = stream.position;
       } else if (!stream.seekable) {
@@ -1185,7 +1185,7 @@ FS.staticInit();` +
         // seek to the end before writing in append mode
         FS.llseek(stream, 0, {{{ cDefine('SEEK_END') }}});
       }
-      var seeking = typeof position !== 'undefined';
+      var seeking = typeof position != 'undefined';
       if (!seeking) {
         position = stream.position;
       } else if (!stream.seekable) {
@@ -1280,7 +1280,7 @@ FS.staticInit();` +
     writeFile: (path, data, opts = {}) => {
       opts.flags = opts.flags || {{{ cDefine('O_TRUNC') | cDefine('O_CREAT') | cDefine('O_WRONLY') }}};
       var stream = FS.open(path, opts.flags, opts.mode);
-      if (typeof data === 'string') {
+      if (typeof data == 'string') {
         var buf = new Uint8Array(lengthBytesUTF8(data)+1);
         var actualNumBytes = stringToUTF8Array(data, buf, 0, buf.length);
         FS.write(stream, buf, 0, actualNumBytes, undefined, opts.canOwn);
@@ -1547,7 +1547,7 @@ FS.staticInit();` +
       return ret;
     },
     createPath: (parent, path, canRead, canWrite) => {
-      parent = typeof parent === 'string' ? parent : FS.getPath(parent);
+      parent = typeof parent == 'string' ? parent : FS.getPath(parent);
       var parts = path.split('/').reverse();
       while (parts.length) {
         var part = parts.pop();
@@ -1563,20 +1563,20 @@ FS.staticInit();` +
       return current;
     },
     createFile: (parent, name, properties, canRead, canWrite) => {
-      var path = PATH.join2(typeof parent === 'string' ? parent : FS.getPath(parent), name);
+      var path = PATH.join2(typeof parent == 'string' ? parent : FS.getPath(parent), name);
       var mode = FS.getMode(canRead, canWrite);
       return FS.create(path, mode);
     },
     createDataFile: (parent, name, data, canRead, canWrite, canOwn) => {
       var path = name;
       if (parent) {
-        parent = typeof parent === 'string' ? parent : FS.getPath(parent);
+        parent = typeof parent == 'string' ? parent : FS.getPath(parent);
         path = name ? PATH.join2(parent, name) : parent;
       }
       var mode = FS.getMode(canRead, canWrite);
       var node = FS.create(path, mode);
       if (data) {
-        if (typeof data === 'string') {
+        if (typeof data == 'string') {
           var arr = new Array(data.length);
           for (var i = 0, len = data.length; i < len; ++i) arr[i] = data.charCodeAt(i);
           data = arr;
@@ -1591,7 +1591,7 @@ FS.staticInit();` +
       return node;
     },
     createDevice: (parent, name, input, output) => {
-      var path = PATH.join2(typeof parent === 'string' ? parent : FS.getPath(parent), name);
+      var path = PATH.join2(typeof parent == 'string' ? parent : FS.getPath(parent), name);
       var mode = FS.getMode(!!input, !!output);
       if (!FS.createDevice.major) FS.createDevice.major = 64;
       var dev = FS.makedev(FS.createDevice.major++, 0);
@@ -1648,7 +1648,7 @@ FS.staticInit();` +
     // been loaded successfully. No-op for files that have been loaded already.
     forceLoadFile: (obj) => {
       if (obj.isDevice || obj.isFolder || obj.link || obj.contents) return true;
-      if (typeof XMLHttpRequest !== 'undefined') {
+      if (typeof XMLHttpRequest != 'undefined') {
         throw new Error("Lazy loading should have been performed (contents set) in createLazyFile, but it was not. Lazy loading only works in web workers. Use --embed-file or --preload-file in emcc on the main thread.");
       } else if (read_) {
         // Command-line.
@@ -1733,10 +1733,10 @@ FS.staticInit();` +
           var start = chunkNum * chunkSize;
           var end = (chunkNum+1) * chunkSize - 1; // including this byte
           end = Math.min(end, datalength-1); // if datalength-1 is selected, this is the last block
-          if (typeof(lazyArray.chunks[chunkNum]) === "undefined") {
+          if (typeof lazyArray.chunks[chunkNum] == 'undefined') {
             lazyArray.chunks[chunkNum] = doXHR(start, end);
           }
-          if (typeof(lazyArray.chunks[chunkNum]) === "undefined") throw new Error("doXHR failed!");
+          if (typeof lazyArray.chunks[chunkNum] == 'undefined') throw new Error('doXHR failed!');
           return lazyArray.chunks[chunkNum];
         });
 
@@ -1752,7 +1752,7 @@ FS.staticInit();` +
         this._chunkSize = chunkSize;
         this.lengthKnown = true;
       };
-      if (typeof XMLHttpRequest !== 'undefined') {
+      if (typeof XMLHttpRequest != 'undefined') {
         if (!ENVIRONMENT_IS_WORKER) throw 'Cannot do synchronous binary XHRs outside webworkers in modern browsers. Use --embed-file or --preload-file in emcc';
         var lazyArray = new LazyUint8Array();
         Object.defineProperties(lazyArray, {
diff --git a/src/library_glemu.js b/src/library_glemu.js
index a22cee4a1136b..5438b1ecbe277 100644
--- a/src/library_glemu.js
+++ b/src/library_glemu.js
@@ -2814,7 +2814,7 @@ var LibraryGLEmulation = {
       };
       {{{ updateExport('glDisable') }}}
 
-      var glTexEnvf = (typeof(_glTexEnvf) != 'undefined') ? _glTexEnvf : () => {};
+      var glTexEnvf = (typeof _glTexEnvf != 'undefined') ? _glTexEnvf : () => {};
       /** @suppress {checkTypes} */
       _glTexEnvf = _emscripten_glTexEnvf = (target, pname, param) => {
         GLImmediate.TexEnvJIT.hook_texEnvf(target, pname, param);
@@ -2823,7 +2823,7 @@ var LibraryGLEmulation = {
       };
       {{{ updateExport('glTexEnvf') }}}
 
-      var glTexEnvi = (typeof(_glTexEnvi) != 'undefined') ? _glTexEnvi : () => {};
+      var glTexEnvi = (typeof _glTexEnvi != 'undefined') ? _glTexEnvi : () => {};
       /** @suppress {checkTypes} */
       _glTexEnvi = _emscripten_glTexEnvi = (target, pname, param) => {
         GLImmediate.TexEnvJIT.hook_texEnvi(target, pname, param);
@@ -2832,7 +2832,7 @@ var LibraryGLEmulation = {
       };
       {{{ updateExport('glTexEnvi') }}}
 
-      var glTexEnvfv = (typeof(_glTexEnvfv) != 'undefined') ? _glTexEnvfv : () => {};
+      var glTexEnvfv = (typeof _glTexEnvfv != 'undefined') ? _glTexEnvfv : () => {};
       /** @suppress {checkTypes} */
       _glTexEnvfv = _emscripten_glTexEnvfv = (target, pname, param) => {
         GLImmediate.TexEnvJIT.hook_texEnvfv(target, pname, param);
diff --git a/src/library_html5.js b/src/library_html5.js
index d0cb5a58a3bd5..d345a4d75dbfa 100644
--- a/src/library_html5.js
+++ b/src/library_html5.js
@@ -303,7 +303,7 @@ var LibraryHTML5 = {
   //    specialHTMLTargets["!canvas"] = Module.canvas;
   // (that will let !canvas map to the canvas held in Module.canvas).
 #if ENVIRONMENT_MAY_BE_WORKER || ENVIRONMENT_MAY_BE_NODE || ENVIRONMENT_MAY_BE_SHELL || USE_PTHREADS
-  $specialHTMLTargets: "[0, typeof document !== 'undefined' ? document : 0, typeof window !== 'undefined' ? window : 0]",
+  $specialHTMLTargets: "[0, typeof document != 'undefined' ? document : 0, typeof window != 'undefined' ? window : 0]",
 #else
   $specialHTMLTargets: "[0, document, window]",
 #endif
@@ -321,7 +321,7 @@ var LibraryHTML5 = {
   $findEventTarget: function(target) {
     target = maybeCStringToJsString(target);
 #if ENVIRONMENT_MAY_BE_WORKER || ENVIRONMENT_MAY_BE_NODE
-    var domElement = specialHTMLTargets[target] || (typeof document !== 'undefined' ? document.querySelector(target) : undefined);
+    var domElement = specialHTMLTargets[target] || (typeof document != 'undefined' ? document.querySelector(target) : undefined);
 #else
     var domElement = specialHTMLTargets[target] || document.querySelector(target);
 #endif
@@ -350,7 +350,7 @@ var LibraryHTML5 = {
      || (target == 'canvas' && Object.keys(GL.offscreenCanvases)[0])
     // If that is not found either, query via the regular DOM selector.
 #if USE_PTHREADS
-     || (typeof document !== 'undefined' && document.querySelector(target));
+     || (typeof document != 'undefined' && document.querySelector(target));
 #else
      || document.querySelector(target);
 #endif
@@ -372,12 +372,12 @@ var LibraryHTML5 = {
       // since DOM events mostly can default to that. Specific callback registrations
       // override their own defaults.
       if (!target) return window;
-      if (typeof target === "number") target = specialHTMLTargets[target] || UTF8ToString(target);
+      if (typeof target == "number") target = specialHTMLTargets[target] || UTF8ToString(target);
       if (target === '#window') return window;
       else if (target === '#document') return document;
       else if (target === '#screen') return screen;
       else if (target === '#canvas') return Module['canvas'];
-      return (typeof target === 'string') ? document.getElementById(target) : target;
+      return (typeof target == 'string') ? document.getElementById(target) : target;
     } catch(e) {
       // In Web Workers, some objects above, such as '#document' do not exist. Gracefully
       // return null for them.
@@ -388,12 +388,12 @@ var LibraryHTML5 = {
   // Like findEventTarget, but looks for OffscreenCanvas elements first
   $findCanvasEventTarget__deps: ['$findEventTarget'],
   $findCanvasEventTarget: function(target) {
-    if (typeof target === 'number') target = UTF8ToString(target);
+    if (typeof target == 'number') target = UTF8ToString(target);
     if (!target || target === '#canvas') {
-      if (typeof GL !== 'undefined' && GL.offscreenCanvases['canvas']) return GL.offscreenCanvases['canvas']; // TODO: Remove this line, target '#canvas' should refer only to Module['canvas'], not to GL.offscreenCanvases['canvas'] - but need stricter tests to be able to remove this line.
+      if (typeof GL != 'undefined' && GL.offscreenCanvases['canvas']) return GL.offscreenCanvases['canvas']; // TODO: Remove this line, target '#canvas' should refer only to Module['canvas'], not to GL.offscreenCanvases['canvas'] - but need stricter tests to be able to remove this line.
       return Module['canvas'];
     }
-    if (typeof GL !== 'undefined' && GL.offscreenCanvases[target]) return GL.offscreenCanvases[target];
+    if (typeof GL != 'undefined' && GL.offscreenCanvases[target]) return GL.offscreenCanvases[target];
     return findEventTarget(target);
   },
 #endif
@@ -697,11 +697,11 @@ var LibraryHTML5 = {
   emscripten_set_wheel_callback_on_thread__deps: ['$JSEvents', '$registerWheelEventCallback', '$findEventTarget'],
   emscripten_set_wheel_callback_on_thread: function(target, userData, useCapture, callbackfunc, targetThread) {
     target = findEventTarget(target);
-    if (typeof target.onwheel !== 'undefined') {
+    if (typeof target.onwheel != 'undefined') {
       registerWheelEventCallback(target, userData, useCapture, callbackfunc, {{{ cDefine('EMSCRIPTEN_EVENT_WHEEL') }}}, "wheel", targetThread);
       return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
 #if MIN_IE_VERSION <= 8 || MIN_SAFARI_VERSION < 60100 // Browsers that do not support https://caniuse.com/#feat=mdn-api_wheelevent
-    } else if (typeof target.onmousewheel !== 'undefined') {
+    } else if (typeof target.onmousewheel != 'undefined') {
       registerWheelEventCallback(target, userData, useCapture, callbackfunc, {{{ cDefine('EMSCRIPTEN_EVENT_WHEEL') }}}, "mousewheel", targetThread);
       return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
 #endif
@@ -1066,7 +1066,7 @@ var LibraryHTML5 = {
   emscripten_get_orientation_status__sig: 'ii',
   emscripten_get_orientation_status__deps: ['$fillOrientationChangeEventData', '$screenOrientation'],
   emscripten_get_orientation_status: function(orientationChangeEvent) {
-    if (!screenOrientation() && typeof orientation === 'undefined') return {{{ cDefine('EMSCRIPTEN_RESULT_NOT_SUPPORTED') }}};
+    if (!screenOrientation() && typeof orientation == 'undefined') return {{{ cDefine('EMSCRIPTEN_RESULT_NOT_SUPPORTED') }}};
     fillOrientationChangeEventData(orientationChangeEvent);
     return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
   },
@@ -2032,7 +2032,7 @@ var LibraryHTML5 = {
   emscripten_get_visibility_status__sig: 'ii',
   emscripten_get_visibility_status__deps: ['$fillVisibilityChangeEventData'],
   emscripten_get_visibility_status: function(visibilityStatus) {
-    if (typeof document.visibilityState === 'undefined' && typeof document.hidden === 'undefined') {
+    if (typeof document.visibilityState == 'undefined' && typeof document.hidden == 'undefined') {
       return {{{ cDefine('EMSCRIPTEN_RESULT_NOT_SUPPORTED') }}};
     }
     fillVisibilityChangeEventData(visibilityStatus);  
@@ -2176,14 +2176,14 @@ var LibraryHTML5 = {
       {{{ makeSetValue('eventStruct+i*8', C_STRUCTS.EmscriptenGamepadEvent.axis, 'e.axes[i]', 'double') }}};
     }
     for (var i = 0; i < e.buttons.length; ++i) {
-      if (typeof(e.buttons[i]) === 'object') {
+      if (typeof e.buttons[i] == 'object') {
         {{{ makeSetValue('eventStruct+i*8', C_STRUCTS.EmscriptenGamepadEvent.analogButton, 'e.buttons[i].value', 'double') }}};
       } else {
         {{{ makeSetValue('eventStruct+i*8', C_STRUCTS.EmscriptenGamepadEvent.analogButton, 'e.buttons[i]', 'double') }}};
       }
     }
     for (var i = 0; i < e.buttons.length; ++i) {
-      if (typeof(e.buttons[i]) === 'object') {
+      if (typeof e.buttons[i] == 'object') {
         {{{ makeSetValue('eventStruct+i*4', C_STRUCTS.EmscriptenGamepadEvent.digitalButton, 'e.buttons[i].pressed', 'i32') }}};
       } else {
         // Assigning a boolean to HEAP32, that's ok, but Closure would like to warn about it:
@@ -2327,7 +2327,7 @@ var LibraryHTML5 = {
   emscripten_set_beforeunload_callback_on_thread__sig: 'iii',
   emscripten_set_beforeunload_callback_on_thread__deps: ['$registerBeforeUnloadEventCallback'],
   emscripten_set_beforeunload_callback_on_thread: function(userData, callbackfunc, targetThread) {
-    if (typeof onbeforeunload === 'undefined') return {{{ cDefine('EMSCRIPTEN_RESULT_NOT_SUPPORTED') }}};
+    if (typeof onbeforeunload == 'undefined') return {{{ cDefine('EMSCRIPTEN_RESULT_NOT_SUPPORTED') }}};
     // beforeunload callback can only be registered on the main browser thread, because the page will go away immediately after returning from the handler,
     // and there is no time to start proxying it anywhere.
     if (targetThread !== {{{ cDefine('EM_CALLBACK_THREAD_CONTEXT_MAIN_BROWSER_THREAD') }}}) return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_PARAM') }}};
@@ -2686,7 +2686,7 @@ var LibraryHTML5 = {
   emscripten_get_device_pixel_ratio__sig: 'd',
   emscripten_get_device_pixel_ratio: function() {
 #if ENVIRONMENT_MAY_BE_NODE || ENVIRONMENT_MAY_BE_SHELL
-    return (typeof devicePixelRatio === 'number' && devicePixelRatio) || 1.0;
+    return (typeof devicePixelRatio == 'number' && devicePixelRatio) || 1.0;
 #else // otherwise, on the web and in workers, things are simpler
 #if MIN_IE_VERSION < 11 || MIN_FIREFOX_VERSION < 18 || MIN_CHROME_VERSION < 4 || MIN_SAFARI_VERSION < 30100 // https://caniuse.com/#feat=devicepixelratio
     return window.devicePixelRatio || 1.0;
diff --git a/src/library_html5_webgl.js b/src/library_html5_webgl.js
index 46a6736634182..884b0d6019b5e 100644
--- a/src/library_html5_webgl.js
+++ b/src/library_html5_webgl.js
@@ -9,7 +9,7 @@ var LibraryHtml5WebGL = {
   $writeGLArray: function(arr, dst, dstLength, heapType) {
 #if ASSERTIONS
     assert(arr);
-    assert(typeof arr.length !== 'undefined');
+    assert(typeof arr.length != 'undefined');
 #endif
     var len = arr.length;
     var writeLength = dstLength < len ? dstLength : len;
@@ -118,7 +118,7 @@ var LibraryHtml5WebGL = {
         err('Performance warning: forcing renderViaOffscreenBackBuffer=true and preserveDrawingBuffer=true since proxying WebGL rendering.');
 #endif
         // We will be proxying - if OffscreenCanvas is supported, we can proxy a bit more efficiently by avoiding having to create an Offscreen FBO.
-        if (typeof OffscreenCanvas === 'undefined') {
+        if (typeof OffscreenCanvas == 'undefined') {
           {{{ makeSetValue('attributes', C_STRUCTS.EmscriptenWebGLContextAttributes.renderViaOffscreenBackBuffer, '1', 'i32') }}};
           {{{ makeSetValue('attributes', C_STRUCTS.EmscriptenWebGLContextAttributes.preserveDrawingBuffer, '1', 'i32') }}};
         }
@@ -138,12 +138,12 @@ var LibraryHtml5WebGL = {
     if (canvas.offscreenCanvas) canvas = canvas.offscreenCanvas;
 
 #if GL_DEBUG
-    if (typeof OffscreenCanvas !== 'undefined' && canvas instanceof OffscreenCanvas) out('emscripten_webgl_create_context: Creating an OffscreenCanvas-based WebGL context on target "' + targetStr + '"');
-    else if (typeof HTMLCanvasElement !== 'undefined' && canvas instanceof HTMLCanvasElement) out('emscripten_webgl_create_context: Creating an HTMLCanvasElement-based WebGL context on target "' + targetStr + '"');
+    if (typeof OffscreenCanvas != 'undefined' && canvas instanceof OffscreenCanvas) out('emscripten_webgl_create_context: Creating an OffscreenCanvas-based WebGL context on target "' + targetStr + '"');
+    else if (typeof HTMLCanvasElement != 'undefined' && canvas instanceof HTMLCanvasElement) out('emscripten_webgl_create_context: Creating an HTMLCanvasElement-based WebGL context on target "' + targetStr + '"');
 #endif
 
     if (contextAttributes.explicitSwapControl) {
-      var supportsOffscreenCanvas = canvas.transferControlToOffscreen || (typeof OffscreenCanvas !== 'undefined' && canvas instanceof OffscreenCanvas);
+      var supportsOffscreenCanvas = canvas.transferControlToOffscreen || (typeof OffscreenCanvas != 'undefined' && canvas instanceof OffscreenCanvas);
 
       if (!supportsOffscreenCanvas) {
 #if OFFSCREEN_FRAMEBUFFER
@@ -246,7 +246,7 @@ var LibraryHtml5WebGL = {
   emscripten_webgl_do_commit_frame__sig: 'i',
   emscripten_webgl_do_commit_frame: function() {
 #if TRACE_WEBGL_CALLS
-    var threadId = (typeof _pthread_self !== 'undefined') ? _pthread_self : function() { return 1; };
+    var threadId = (typeof _pthread_self != 'undefined') ? _pthread_self : function() { return 1; };
     err('[Thread ' + threadId() + ', GL ctx: ' + GL.currentContext.handle + ']: emscripten_webgl_do_commit_frame()');
 #endif
     if (!GL.currentContext || !GL.currentContext.GLctx) {
@@ -389,7 +389,7 @@ var LibraryHtml5WebGL = {
     // TODO: Add a new build mode, e.g. OFFSCREENCANVAS_SUPPORT=2, which
     // necessitates OffscreenCanvas support at build time, and "return 1;" here in that build mode.
 #if OFFSCREENCANVAS_SUPPORT
-    return typeof OffscreenCanvas !== 'undefined';
+    return typeof OffscreenCanvas != 'undefined';
 #else
     return 0;
 #endif
diff --git a/src/library_idbfs.js b/src/library_idbfs.js
index 5f351b95e7026..f5d226014bf64 100644
--- a/src/library_idbfs.js
+++ b/src/library_idbfs.js
@@ -9,9 +9,9 @@ mergeInto(LibraryManager.library, {
   $IDBFS: {
     dbs: {},
     indexedDB: () => {
-      if (typeof indexedDB !== 'undefined') return indexedDB;
+      if (typeof indexedDB != 'undefined') return indexedDB;
       var ret = null;
-      if (typeof window === 'object') ret = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
+      if (typeof window == 'object') ret = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
       assert(ret, 'IDBFS used, but indexedDB not supported');
       return ret;
     },
diff --git a/src/library_noderawfs.js b/src/library_noderawfs.js
index ad031d2924529..78f9958308f29 100644
--- a/src/library_noderawfs.js
+++ b/src/library_noderawfs.js
@@ -83,7 +83,7 @@ mergeInto(LibraryManager.library, {
     },
     utime: function() { fs.utimesSync.apply(void 0, arguments); },
     open: function(path, flags, mode, suggestFD) {
-      if (typeof flags === "string") {
+      if (typeof flags == "string") {
         flags = VFS.modeStringToFlags(flags)
       }
       var pathTruncated = path.split('/').map(function(s) { return s.substr(0, 255); }).join('/');
@@ -131,7 +131,7 @@ mergeInto(LibraryManager.library, {
         // this stream is created by in-memory filesystem
         return VFS.read(stream, buffer, offset, length, position);
       }
-      var seeking = typeof position !== 'undefined';
+      var seeking = typeof position != 'undefined';
       if (!seeking && stream.seekable) position = stream.position;
       var bytesRead = fs.readSync(stream.nfd, Buffer.from(buffer.buffer), offset, length, position);
       // update position marker when non-seeking
@@ -147,7 +147,7 @@ mergeInto(LibraryManager.library, {
         // seek to the end before writing in append mode
         FS.llseek(stream, 0, +"{{{ cDefine('SEEK_END') }}}");
       }
-      var seeking = typeof position !== 'undefined';
+      var seeking = typeof position != 'undefined';
       if (!seeking && stream.seekable) position = stream.position;
       var bytesWritten = fs.writeSync(stream.nfd, Buffer.from(buffer.buffer), offset, length, position);
       // update position marker when non-seeking
diff --git a/src/library_openal.js b/src/library_openal.js
index 997be92ba2b0e..ab0d9aea1a768 100644
--- a/src/library_openal.js
+++ b/src/library_openal.js
@@ -181,11 +181,11 @@ var LibraryOpenAL = {
 
           audioSrc.connect(src.gain);
 
-          if (typeof(audioSrc.start) !== 'undefined') {
+          if (typeof audioSrc.start != 'undefined') {
             // Sample the current time as late as possible to mitigate drift
             startTime = Math.max(startTime, src.context.audioCtx.currentTime);
             audioSrc.start(startTime, startOffset);
-          } else if (typeof(audioSrc.noteOn) !== 'undefined') {
+          } else if (typeof audioSrc.noteOn != 'undefined') {
             startTime = Math.max(startTime, src.context.audioCtx.currentTime);
             audioSrc.noteOn(startTime);
 #if OPENAL_DEBUG
@@ -2079,7 +2079,7 @@ var LibraryOpenAL = {
       }
     }
 
-    if (typeof(AudioContext) !== 'undefined' || typeof(webkitAudioContext) !== 'undefined') {
+    if (typeof AudioContext != 'undefined' || typeof webkitAudioContext != 'undefined') {
       var deviceId = AL.newId();
       AL.deviceRefCounts[deviceId] = 0;
       return deviceId;
@@ -2202,7 +2202,7 @@ var LibraryOpenAL = {
     autoResumeAudioContext(ac);
 
     // Old Web Audio API (e.g. Safari 6.0.5) had an inconsistently named createGainNode function.
-    if (typeof(ac.createGain) === 'undefined') {
+    if (typeof ac.createGain == 'undefined') {
       ac.createGain = ac.createGainNode;
     }
 
@@ -2428,16 +2428,16 @@ var LibraryOpenAL = {
       ret = 'Out of Memory';
       break;
     case 0x1004 /* ALC_DEFAULT_DEVICE_SPECIFIER */:
-      if (typeof(AudioContext) !== 'undefined' ||
-          typeof(webkitAudioContext) !== 'undefined') {
+      if (typeof AudioContext != 'undefined' ||
+          typeof webkitAudioContext != 'undefined') {
         ret = AL.DEVICE_NAME;
       } else {
         return 0;
       }
       break;
     case 0x1005 /* ALC_DEVICE_SPECIFIER */:
-      if (typeof(AudioContext) !== 'undefined' ||
-          typeof(webkitAudioContext) !== 'undefined') {
+      if (typeof AudioContext != 'undefined' ||
+          typeof webkitAudioContext != 'undefined') {
         ret = AL.DEVICE_NAME.concat('\0');
       } else {
         ret = '\0';
diff --git a/src/library_path.js b/src/library_path.js
index d68e653a66342..7fe59dfc3deeb 100644
--- a/src/library_path.js
+++ b/src/library_path.js
@@ -94,7 +94,7 @@ mergeInto(LibraryManager.library, {
       for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
         var path = (i >= 0) ? arguments[i] : FS.cwd();
         // Skip empty and invalid entries
-        if (typeof path !== 'string') {
+        if (typeof path != 'string') {
           throw new TypeError('Arguments to path.resolve must be strings');
         } else if (!path) {
           return ''; // an invalid portion invalidates the whole thing
diff --git a/src/library_pthread.js b/src/library_pthread.js
index 00fd658f7c07d..561c654eb0e1f 100644
--- a/src/library_pthread.js
+++ b/src/library_pthread.js
@@ -31,7 +31,7 @@ var LibraryPThread = {
     debugInit: function() {
       function pthreadLogPrefix() {
         var t = 0;
-        if (runtimeInitialized && !runtimeExited && typeof _pthread_self !== 'undefined') {
+        if (runtimeInitialized && !runtimeExited && typeof _pthread_self != 'undefined') {
           t = _pthread_self();
         }
         return 'w:' + (Module['workerID'] || 0) + ',t:' + ptrToString(t) + ': ';
@@ -195,7 +195,7 @@ var LibraryPThread = {
     },
     receiveObjectTransfer: function(data) {
 #if OFFSCREENCANVAS_SUPPORT
-      if (typeof GL !== 'undefined') {
+      if (typeof GL != 'undefined') {
         Object.assign(GL.offscreenCanvases, data.offscreenCanvases);
         if (!Module['canvas'] && data.moduleCanvasId && GL.offscreenCanvases[data.moduleCanvasId]) {
           Module['canvas'] = GL.offscreenCanvases[data.moduleCanvasId].offscreenCanvas;
@@ -364,7 +364,7 @@ var LibraryPThread = {
 #endif
 #if TRUSTED_TYPES
         // Use Trusted Types compatible wrappers.
-        if (typeof trustedTypes !== 'undefined' && trustedTypes.createPolicy) {
+        if (typeof trustedTypes != 'undefined' && trustedTypes.createPolicy) {
           var p = trustedTypes.createPolicy(
             'emscripten#workerPolicy1',
             {
@@ -390,7 +390,7 @@ var LibraryPThread = {
 #endif
 #if TRUSTED_TYPES
       // Use Trusted Types compatible wrappers.
-      if (typeof trustedTypes !== 'undefined' && trustedTypes.createPolicy) {
+      if (typeof trustedTypes != 'undefined' && trustedTypes.createPolicy) {
         var p = trustedTypes.createPolicy('emscripten#workerPolicy2', { createScriptURL: function(ignored) { return pthreadMainJs } });
         PThread.unusedWorkers.push(new Worker(p.createScriptURL('ignored')));
       } else
@@ -584,7 +584,7 @@ var LibraryPThread = {
   },
 
   emscripten_has_threading_support: function() {
-    return typeof SharedArrayBuffer !== 'undefined';
+    return typeof SharedArrayBuffer != 'undefined';
   },
 
   emscripten_num_logical_cores: function() {
@@ -624,7 +624,7 @@ var LibraryPThread = {
   __pthread_create_js__sig: 'iiiii',
   __pthread_create_js__deps: ['$spawnThread', 'pthread_self', 'memalign', 'emscripten_sync_run_in_main_thread_4'],
   __pthread_create_js: function(pthread_ptr, attr, start_routine, arg) {
-    if (typeof SharedArrayBuffer === 'undefined') {
+    if (typeof SharedArrayBuffer == 'undefined') {
       err('Current environment does not support SharedArrayBuffer, pthreads are not available!');
       return {{{ cDefine('EAGAIN') }}};
     }
@@ -669,7 +669,7 @@ var LibraryPThread = {
           name = Module['canvas'].id;
         }
 #if ASSERTIONS
-        assert(typeof GL === 'object', 'OFFSCREENCANVAS_SUPPORT assumes GL is in use (you can force-include it with -s \'DEFAULT_LIBRARY_FUNCS_TO_INCLUDE=["$GL"]\')');
+        assert(typeof GL == 'object', 'OFFSCREENCANVAS_SUPPORT assumes GL is in use (you can force-include it with -s \'DEFAULT_LIBRARY_FUNCS_TO_INCLUDE=["$GL"]\')');
 #endif
         if (GL.offscreenCanvases[name]) {
           offscreenCanvasInfo = GL.offscreenCanvases[name];
@@ -897,7 +897,7 @@ var LibraryPThread = {
       for (var i = 0; i < numCallArgs; i++) {
         var arg = outerArgs[2 + i];
   #if WASM_BIGINT
-        if (typeof arg === 'bigint') {
+        if (typeof arg == 'bigint') {
           // The prefix is non-zero to indicate a bigint.
           HEAP64[b + 2*i] = BigInt(1);
           HEAP64[b + 2*i + 1] = arg;
diff --git a/src/library_pthread_stub.js b/src/library_pthread_stub.js
index 1053f803d31ce..bb22d57b68b68 100644
--- a/src/library_pthread_stub.js
+++ b/src/library_pthread_stub.js
@@ -11,7 +11,7 @@ var LibraryPThreadStub = {
 
   emscripten_is_main_browser_thread: function() {
 #if MINIMAL_RUNTIME
-    return typeof importScripts === 'undefined';
+    return typeof importScripts == 'undefined';
 #else
     return !ENVIRONMENT_IS_WORKER;
 #endif
diff --git a/src/library_sdl.js b/src/library_sdl.js
index 4448a208f6884..129d64e6c13e1 100644
--- a/src/library_sdl.js
+++ b/src/library_sdl.js
@@ -896,7 +896,7 @@ var LibrarySDL = {
 
     // returns false if the event was determined to be irrelevant
     makeCEvent: function(event, ptr) {
-      if (typeof event === 'number') {
+      if (typeof event == 'number') {
         // This is a pointer to a copy of a native C event that was SDL_PushEvent'ed
         _memcpy(ptr, event, {{{ C_STRUCTS.SDL_KeyboardEvent.__size__ }}});
         _free(event); // the copy is no longer needed
@@ -1177,8 +1177,8 @@ var LibrarySDL = {
       // Initialize Web Audio API if we haven't done so yet. Note: Only initialize Web Audio context ever once on the web page,
       // since initializing multiple times fails on Chrome saying 'audio resources have been exhausted'.
       if (!SDL.audioContext) {
-        if (typeof(AudioContext) !== 'undefined') SDL.audioContext = new AudioContext();
-        else if (typeof(webkitAudioContext) !== 'undefined') SDL.audioContext = new webkitAudioContext();
+        if (typeof AudioContext != 'undefined') SDL.audioContext = new AudioContext();
+        else if (typeof webkitAudioContext != 'undefined') SDL.audioContext = new webkitAudioContext();
       }
     },
 
@@ -1252,7 +1252,7 @@ var LibrarySDL = {
     // Abstracts away implementation differences.
     // Returns 'true' if pressed, 'false' otherwise.
     getJoystickButtonState: function(button) {
-      if (typeof button === 'object') {
+      if (typeof button == 'object') {
         // Current gamepad API editor's draft (Firefox Nightly)
         // https://dvcs.w3.org/hg/gamepad/raw-file/default/gamepad.html#idl-def-GamepadButton
         return button['pressed'];
@@ -1268,13 +1268,13 @@ var LibrarySDL = {
         var state = SDL.getGamepad(joystick - 1);
         var prevState = SDL.lastJoystickState[joystick];
         // If joystick was removed, state returns null.
-        if (typeof state === 'undefined') return;
+        if (typeof state == 'undefined') return;
         if (state === null) return;
         // Check only if the timestamp has differed.
         // NOTE: Timestamp is not available in Firefox.
         // NOTE: Timestamp is currently not properly set for the GearVR controller
         //       on Samsung Internet: it is always zero.
-        if (typeof state.timestamp !== 'number' || state.timestamp !== prevState.timestamp || !state.timestamp) {
+        if (typeof state.timestamp != 'number' || state.timestamp != prevState.timestamp || !state.timestamp) {
           var i;
           for (i = 0; i < state.buttons.length; i++) {
             var buttonState = SDL.getJoystickButtonState(state.buttons[i]);
@@ -1631,7 +1631,7 @@ var LibrarySDL = {
       var dst = 0;
       var isScreen = surf == SDL.screen;
       var num;
-      if (typeof CanvasPixelArray !== 'undefined' && data instanceof CanvasPixelArray) {
+      if (typeof CanvasPixelArray != 'undefined' && data instanceof CanvasPixelArray) {
         // IE10/IE11: ImageData objects are backed by the deprecated CanvasPixelArray,
         // not UInt8ClampedArray. These don't have buffers, so we need to revert
         // to copying a byte at a time. We do the undefined check because modern
@@ -1746,7 +1746,7 @@ var LibrarySDL = {
   SDL_WM_SetCaption__proxy: 'sync',
   SDL_WM_SetCaption__sig: 'vii',
   SDL_WM_SetCaption: function(title, icon) {
-    if (title && typeof setWindowTitle !== 'undefined') {
+    if (title && typeof setWindowTitle != 'undefined') {
       setWindowTitle(UTF8ToString(title));
     }
     icon = icon && UTF8ToString(icon);
@@ -2584,9 +2584,9 @@ var LibrarySDL = {
           // Don't ever start buffer playbacks earlier from current time than a given constant 'SDL.audio.bufferingDelay', since a browser
           // may not be able to mix that audio clip in immediately, and there may be subsequent jitter that might cause the stream to starve.
           var playtime = Math.max(curtime + SDL.audio.bufferingDelay, SDL.audio.nextPlayTime);
-          if (typeof source['start'] !== 'undefined') {
+          if (typeof source['start'] != 'undefined') {
             source['start'](playtime); // New Web Audio API: sound sources are started with a .start() call.
-          } else if (typeof source['noteOn'] !== 'undefined') {
+          } else if (typeof source['noteOn'] != 'undefined') {
             source['noteOn'](playtime); // Support old Web Audio API specification which had the .noteOn() API.
           }
           /*
@@ -3195,7 +3195,7 @@ var LibrarySDL = {
       // like CI might be creating a context here but one that is not entirely
       // valid. Check that explicitly and fall back to a plain Canvas if we need
       // to. See https://github.com/emscripten-core/emscripten/issues/16242
-      if (typeof SDL.ttfContext.measureText !== 'function') {
+      if (typeof SDL.ttfContext.measureText != 'function') {
         throw 'bad context';
       }
     } catch (ex) {
@@ -3205,7 +3205,7 @@ var LibrarySDL = {
 #if ASSERTIONS
     // Check the final context looks valid. See
     // https://github.com/emscripten-core/emscripten/issues/16242
-    assert(typeof SDL.ttfContext.measureText === 'function',
+    assert(typeof SDL.ttfContext.measureText == 'function',
            'context ' + SDL.ttfContext + 'must provide valid methods');
 #endif
     return 0;
diff --git a/src/library_sockfs.js b/src/library_sockfs.js
index 1134f741e9b32..e609d2ff87bb5 100644
--- a/src/library_sockfs.js
+++ b/src/library_sockfs.js
@@ -143,7 +143,7 @@ mergeInto(LibraryManager.library, {
       createPeer: function(sock, addr, port) {
         var ws;
 
-        if (typeof addr === 'object') {
+        if (typeof addr == 'object') {
           ws = addr;
           addr = null;
           port = null;
@@ -251,7 +251,7 @@ mergeInto(LibraryManager.library, {
         // if this is a bound dgram socket, send the port number first to allow
         // us to override the ephemeral port reported to us by remotePort on the
         // remote end.
-        if (sock.type === {{{ cDefine('SOCK_DGRAM') }}} && typeof sock.sport !== 'undefined') {
+        if (sock.type === {{{ cDefine('SOCK_DGRAM') }}} && typeof sock.sport != 'undefined') {
 #if SOCKET_DEBUG
           out('websocket queuing port message (port ' + sock.sport + ')');
 #endif
@@ -300,7 +300,7 @@ mergeInto(LibraryManager.library, {
         };
 
         function handleMessage(data) {
-          if (typeof data === 'string') {
+          if (typeof data == 'string') {
             var encoder = new TextEncoder(); // should be utf-8
             data = encoder.encode(data); // make a typed array from the string
           } else {
@@ -444,7 +444,7 @@ mergeInto(LibraryManager.library, {
         return 0;
       },
       bind: function(sock, addr, port) {
-        if (typeof sock.saddr !== 'undefined' || typeof sock.sport !== 'undefined') {
+        if (typeof sock.saddr != 'undefined' || typeof sock.sport != 'undefined') {
           throw new FS.ErrnoError({{{ cDefine('EINVAL') }}});  // already bound
         }
         sock.saddr = addr;
@@ -478,7 +478,7 @@ mergeInto(LibraryManager.library, {
         // }
 
         // early out if we're already connected / in the middle of connecting
-        if (typeof sock.daddr !== 'undefined' && typeof sock.dport !== 'undefined') {
+        if (typeof sock.daddr != 'undefined' && typeof sock.dport != 'undefined') {
           var dest = SOCKFS.websocket_sock_ops.getPeer(sock, sock.daddr, sock.dport);
           if (dest) {
             if (dest.socket.readyState === dest.socket.CONNECTING) {
@@ -752,7 +752,7 @@ mergeInto(LibraryManager.library, {
         if (e instanceof ExitStatus) {
           return;
         } else {
-          if (e && typeof e === 'object' && e.stack) err('exception thrown: ' + [e, e.stack]);
+          if (e && typeof e == 'object' && e.stack) err('exception thrown: ' + [e, e.stack]);
           throw e;
         }
       }
diff --git a/src/library_syscall.js b/src/library_syscall.js
index fea550030ccf1..3513aabd2f40e 100644
--- a/src/library_syscall.js
+++ b/src/library_syscall.js
@@ -1134,7 +1134,7 @@ function wrapSyscallFunction(x, library, isWasi) {
   }
 
   var t = library[x];
-  if (typeof t === 'string') return;
+  if (typeof t == 'string') return;
   t = t.toString();
 
   // If a syscall uses FS, but !SYSCALLS_REQUIRE_FILESYSTEM, then the user
@@ -1184,7 +1184,7 @@ function wrapSyscallFunction(x, library, isWasi) {
     pre += 'try {\n';
     handler +=
     "} catch (e) {\n" +
-    "  if (typeof FS === 'undefined' || !(e instanceof FS.ErrnoError)) throw e;\n";
+    "  if (typeof FS == 'undefined' || !(e instanceof FS.ErrnoError)) throw e;\n";
 #if SYSCALL_DEBUG
     handler +=
     "  err('error: syscall failed with ' + e.errno + ' (' + ERRNO_MESSAGES[e.errno] + ')');\n" +
diff --git a/src/library_trace.js b/src/library_trace.js
index 5658890efe687..a453715f4f3ae 100644
--- a/src/library_trace.js
+++ b/src/library_trace.js
@@ -219,7 +219,7 @@ var LibraryTracing = {
   },
 
   emscripten_trace_record_allocation: function(address, size) {
-    if (typeof Module['onMalloc'] === 'function') Module['onMalloc'](address, size);
+    if (typeof Module['onMalloc'] == 'function') Module['onMalloc'](address, size);
     if (EmscriptenTrace.postEnabled) {
       var now = EmscriptenTrace.now();
       EmscriptenTrace.post([EmscriptenTrace.EVENT_ALLOCATE,
@@ -228,7 +228,7 @@ var LibraryTracing = {
   },
 
   emscripten_trace_record_reallocation: function(old_address, new_address, size) {
-    if (typeof Module['onRealloc'] === 'function') Module['onRealloc'](old_address, new_address, size);
+    if (typeof Module['onRealloc'] == 'function') Module['onRealloc'](old_address, new_address, size);
     if (EmscriptenTrace.postEnabled) {
       var now = EmscriptenTrace.now();
       EmscriptenTrace.post([EmscriptenTrace.EVENT_REALLOCATE,
@@ -237,7 +237,7 @@ var LibraryTracing = {
   },
 
   emscripten_trace_record_free: function(address) {
-    if (typeof Module['onFree'] === 'function') Module['onFree'](address);
+    if (typeof Module['onFree'] == 'function') Module['onFree'](address);
     if (EmscriptenTrace.postEnabled) {
       var now = EmscriptenTrace.now();
       EmscriptenTrace.post([EmscriptenTrace.EVENT_FREE,
diff --git a/src/library_uuid.js b/src/library_uuid.js
index e4980d24cf1d4..7d042735606b7 100644
--- a/src/library_uuid.js
+++ b/src/library_uuid.js
@@ -45,8 +45,8 @@ mergeInto(LibraryManager.library, {
       } catch(e) {}
 #endif // ENVIRONMENT_MAY_BE_NODE
     } else if (ENVIRONMENT_IS_WEB &&
-               typeof(window.crypto) !== 'undefined' &&
-               typeof(window.crypto.getRandomValues) !== 'undefined') {
+               typeof window.crypto != 'undefined' &&
+               typeof window.crypto.getRandomValues != 'undefined') {
       // If crypto.getRandomValues is available try to use it.
       uuid = new Uint8Array(16);
       window.crypto.getRandomValues(uuid);
diff --git a/src/library_wasi.js b/src/library_wasi.js
index a514ba2c40969..d91a7f563c0da 100644
--- a/src/library_wasi.js
+++ b/src/library_wasi.js
@@ -21,7 +21,7 @@ var WasiLibrary = {
       // Default values.
 #if !DETERMINISTIC
       // Browser language detection #8751
-      var lang = ((typeof navigator === 'object' && navigator.languages && navigator.languages[0]) || 'C').replace('-', '_') + '.UTF-8';
+      var lang = ((typeof navigator == 'object' && navigator.languages && navigator.languages[0]) || 'C').replace('-', '_') + '.UTF-8';
 #else
       // Deterministic language detection, ignore the browser's language.
       var lang = 'C.UTF-8';
diff --git a/src/library_webgl.js b/src/library_webgl.js
index 5212fcf8ee364..012759efcfe2e 100644
--- a/src/library_webgl.js
+++ b/src/library_webgl.js
@@ -520,7 +520,7 @@ var LibraryGL = {
       var numArgs = glCtx[realf].length;
       if (numArgs === undefined) console.warn('Unexpected WebGL function ' + f + ' when binding TRACE_WEBGL_CALLS');
       var contextHandle = glCtx.canvas.GLctxObject.handle;
-      var threadId = (typeof _pthread_self !== 'undefined') ? _pthread_self : function() { return 1; };
+      var threadId = (typeof _pthread_self != 'undefined') ? _pthread_self : function() { return 1; };
       // Accessing 'arguments' is super slow, so to avoid overhead, statically reason the number of arguments.
       switch (numArgs) {
         case 0: glCtx[f] = function webgl_0() { var ret = glCtx[realf](); err('[Thread ' + threadId() + ', GL ctx: ' + contextHandle + ']: ' + f + '() -> ' + ret); return ret; }; break;
@@ -542,8 +542,8 @@ var LibraryGL = {
     hookWebGL: function(glCtx) {
       if (!glCtx) glCtx = this.detectWebGLContext();
       if (!glCtx) return;
-      if (!((typeof WebGLRenderingContext !== 'undefined' && glCtx instanceof WebGLRenderingContext)
-       || (typeof WebGL2RenderingContext !== 'undefined' && glCtx instanceof WebGL2RenderingContext))) {
+      if (!((typeof WebGLRenderingContext != 'undefined' && glCtx instanceof WebGLRenderingContext)
+       || (typeof WebGL2RenderingContext != 'undefined' && glCtx instanceof WebGL2RenderingContext))) {
         return;
       }
 
@@ -553,7 +553,7 @@ var LibraryGL = {
       // Hot GL functions are ones that you'd expect to find during render loops (render calls, dynamic resource uploads), cold GL functions are load time functions (shader compilation, texture/mesh creation)
       // Distinguishing between these two allows pinpointing locations of troublesome GL usage that might cause performance issues.
       for (var f in glCtx) {
-        if (typeof glCtx[f] !== 'function' || f.startsWith('real_')) continue;
+        if (typeof glCtx[f] != 'function' || f.startsWith('real_')) continue;
         this.hookWebGLFunction(f, glCtx);
       }
       // The above injection won't work for texImage2D and texSubImage2D, which have multiple overloads.
@@ -622,7 +622,7 @@ var LibraryGL = {
       if (Module['preinitializedWebGLContext']) {
         var ctx = Module['preinitializedWebGLContext'];
 #if MAX_WEBGL_VERSION >= 2
-        webGLContextAttributes.majorVersion = (typeof WebGL2RenderingContext !== 'undefined' && ctx instanceof WebGL2RenderingContext) ? 2 : 1;
+        webGLContextAttributes.majorVersion = (typeof WebGL2RenderingContext != 'undefined' && ctx instanceof WebGL2RenderingContext) ? 2 : 1;
 #else
         webGLContextAttributes.majorVersion = 1;
 #endif
@@ -1014,7 +1014,7 @@ var LibraryGL = {
       if (ctx.canvas) ctx.canvas.GLctxObject = context;
       GL.contexts[handle] = context;
 #if GL_SUPPORT_AUTOMATIC_ENABLE_EXTENSIONS
-      if (typeof webGLContextAttributes.enableExtensionsByDefault === 'undefined' || webGLContextAttributes.enableExtensionsByDefault) {
+      if (typeof webGLContextAttributes.enableExtensionsByDefault == 'undefined' || webGLContextAttributes.enableExtensionsByDefault) {
         GL.initExtensions(context);
       }
 #endif
@@ -1063,7 +1063,7 @@ var LibraryGL = {
 
     deleteContext: function(contextHandle) {
       if (GL.currentContext === GL.contexts[contextHandle]) GL.currentContext = null;
-      if (typeof JSEvents === 'object') JSEvents.removeAllHandlersOnTarget(GL.contexts[contextHandle].GLctx.canvas); // Release all JS event handlers on the DOM element that the GL context is associated with since the context is now deleted.
+      if (typeof JSEvents == 'object') JSEvents.removeAllHandlersOnTarget(GL.contexts[contextHandle].GLctx.canvas); // Release all JS event handlers on the DOM element that the GL context is associated with since the context is now deleted.
       if (GL.contexts[contextHandle] && GL.contexts[contextHandle].GLctx.canvas) GL.contexts[contextHandle].GLctx.canvas.GLctxObject = undefined; // Make sure the canvas object no longer refers to the context object so there are no GC surprises.
 #if USE_PTHREADS
       _free(GL.contexts[contextHandle].handle);
@@ -1294,7 +1294,7 @@ var LibraryGL = {
 
     if (ret === undefined) {
       var result = GLctx.getParameter(name_);
-      switch (typeof(result)) {
+      switch (typeof result) {
         case "number":
           ret = result;
           break;
@@ -2073,7 +2073,7 @@ var LibraryGL = {
 
       // If an integer, we have not yet bound the location, so do it now. The integer value specifies the array index
       // we should bind to.
-      if (typeof webglLoc === 'number') {
+      if (typeof webglLoc == 'number') {
         p.uniformLocsById[location] = webglLoc = GLctx.getUniformLocation(p, p.uniformArrayNamesById[location] + (webglLoc > 0 ? '[' + webglLoc + ']' : ''));
       }
       // Else an already cached WebGLUniformLocation, return it.
@@ -4214,14 +4214,14 @@ function recordGLProcAddressGet(lib) {
   Object.keys(lib).forEach((x) => {
     if (isJsLibraryConfigIdentifier(x)) return;
     if (x.substr(0, 2) != 'gl') return;
-    while (typeof lib[x] === 'string') {
+    while (typeof lib[x] == 'string') {
       // resolve aliases right here, simpler for fastcomp
       copyLibEntry(lib, x, lib[x]);
     }
     const y = 'emscripten_' + x;
     lib[x + '__deps'] = (lib[x + '__deps'] || []).map((dep) => {
       // prefix dependencies as well
-      if (typeof dep === 'string' && dep[0] == 'g' && dep[1] == 'l' && lib[dep]) {
+      if (typeof dep == 'string' && dep[0] == 'g' && dep[1] == 'l' && lib[dep]) {
         const orig = dep;
         dep = 'emscripten_' + dep;
         let fixed = lib[x].toString().replace(new RegExp('_' + orig + '\\(', 'g'), '_' + dep + '(');
diff --git a/src/library_webgl2.js b/src/library_webgl2.js
index 632436a4bc592..30e356c069cc5 100644
--- a/src/library_webgl2.js
+++ b/src/library_webgl2.js
@@ -1128,7 +1128,7 @@ var webgl2Funcs = [[0, 'endTransformFeedback pauseTransformFeedback resumeTransf
 
 // If user passes -s MAX_WEBGL_VERSION >= 2 -s STRICT=1 but not -lGL (to link in WebGL 1), then WebGL2 library should not
 // be linked in as well.
-if (typeof createGLPassthroughFunctions === 'undefined') {
+if (typeof createGLPassthroughFunctions == 'undefined') {
   throw 'In order to use WebGL 2 in strict mode with -s MAX_WEBGL_VERSION=2, you need to link in WebGL support with -lGL!';
 }
 
diff --git a/src/library_webgpu.js b/src/library_webgpu.js
index e7523a7f934bf..11297569a3620 100644
--- a/src/library_webgpu.js
+++ b/src/library_webgpu.js
@@ -73,7 +73,7 @@
       return 'assert(' + str + ');';
     },
     makeCheckDefined: function(name) {
-      return this.makeCheck('typeof ' + name + ' !== "undefined"');
+      return this.makeCheck('typeof ' + name + ' != "undefined"');
     },
     makeCheckDescriptor: function(descriptor) {
       // Assert descriptor is non-null, then that its nextInChain is null.
@@ -155,7 +155,7 @@ var LibraryWebGPU = {
           wrapper = wrapper || {};
 
           var id = this.nextId++;
-          {{{ gpu.makeCheck("typeof this.objects[id] === 'undefined'") }}}
+          {{{ gpu.makeCheck("typeof this.objects[id] == 'undefined'") }}}
           wrapper.refcount = 1;
           wrapper.object = object;
           this.objects[id] = wrapper;
@@ -741,8 +741,8 @@ var LibraryWebGPU = {
         var OutOfMemory = 0x00000002;
         var type;
 #if ASSERTIONS
-        assert(typeof GPUValidationError !== 'undefined');
-        assert(typeof GPUOutOfMemoryError !== 'undefined');
+        assert(typeof GPUValidationError != 'undefined');
+        assert(typeof GPUOutOfMemoryError != 'undefined');
 #endif
         if (ev.error instanceof GPUValidationError) type = Validation;
         else if (ev.error instanceof GPUOutOfMemoryError) type = OutOfMemory;
diff --git a/src/library_websocket.js b/src/library_websocket.js
index d654dc7c03bb8..382c9dffcb075 100644
--- a/src/library_websocket.js
+++ b/src/library_websocket.js
@@ -248,7 +248,7 @@ var LibraryWebSocket = {
       err('websocket event "message": socketId='+socketId+',userData='+userData+',callbackFunc='+callbackFunc+')');
 #endif
       HEAPU32[WS.socketEvent>>2] = socketId;
-      if (typeof e.data === 'string') {
+      if (typeof e.data == 'string') {
         var len = lengthBytesUTF8(e.data)+1;
         var buf = _malloc(len);
         stringToUTF8(e.data, buf, len);
@@ -285,7 +285,7 @@ var LibraryWebSocket = {
   emscripten_websocket_new__proxy: 'sync',
   emscripten_websocket_new__sig: 'ii',
   emscripten_websocket_new: function(createAttributes) {
-    if (typeof WebSocket === 'undefined') {
+    if (typeof WebSocket == 'undefined') {
 #if WEBSOCKET_DEBUG
       err('emscripten_websocket_new(): WebSocket API is not supported by current browser)');
 #endif
@@ -423,7 +423,7 @@ var LibraryWebSocket = {
   emscripten_websocket_is_supported__proxy: 'sync',
   emscripten_websocket_is_supported__sig: 'i',
   emscripten_websocket_is_supported: function() {
-    return typeof WebSocket !== 'undefined';
+    return typeof WebSocket != 'undefined';
   },
 
   emscripten_websocket_deinitialize__deps: ['$WS'],
diff --git a/src/memoryprofiler.js b/src/memoryprofiler.js
index dc36733f2e5ea..a4b0bde3c1301 100644
--- a/src/memoryprofiler.js
+++ b/src/memoryprofiler.js
@@ -15,12 +15,12 @@ var emscriptenMemoryProfiler = {
 
   // Allocations of memory blocks larger than this threshold will get their
   // detailed callstack captured and logged at runtime.
-  trackedCallstackMinSizeBytes: (typeof new Error().stack === 'undefined') ? Infinity : 16*1024*1024,
+  trackedCallstackMinSizeBytes: (typeof new Error().stack == 'undefined') ? Infinity : 16*1024*1024,
 
   // Allocations from call sites having more than this many outstanding
   // allocated pointers will get their detailed callstack captured and logged at
   // runtime.
-  trackedCallstackMinAllocCount: (typeof new Error().stack === 'undefined') ? Infinity : 10000,
+  trackedCallstackMinAllocCount: (typeof new Error().stack == 'undefined') ? Infinity : 10000,
 
   // If true, we hook into stackAlloc to be able to catch better estimate of the
   // maximum used STACK space.  You might only ever want to set this to false
@@ -161,7 +161,7 @@ var emscriptenMemoryProfiler = {
   },
 
   recordStackWatermark: function() {
-    if (typeof runtimeInitialized === 'undefined' || runtimeInitialized) {
+    if (typeof runtimeInitialized == 'undefined' || runtimeInitialized) {
       var self = emscriptenMemoryProfiler;
       self.stackTopWatermark = Math.min(self.stackTopWatermark, _emscripten_stack_get_current());
     }
@@ -251,7 +251,7 @@ var emscriptenMemoryProfiler = {
     if (!Module['preRun']) Module['preRun'] = [];
     Module['preRun'].push(function() { emscriptenMemoryProfiler.onPreloadComplete(); });
 
-    if (emscriptenMemoryProfiler.hookStackAlloc && typeof stackAlloc === 'function') {
+    if (emscriptenMemoryProfiler.hookStackAlloc && typeof stackAlloc == 'function') {
       // Inject stack allocator.
       var prevStackAlloc = stackAlloc;
       var hookedStackAlloc = function(size) {
@@ -368,7 +368,7 @@ var emscriptenMemoryProfiler = {
   },
 
   countOpenALAudioDataSize: function countOpenALAudioDataSize() {
-    if (typeof AL == "undefined" || !AL.currentContext) return 0;
+    if (typeof AL == 'undefined' || !AL.currentContext) return 0;
 
     var totalMemory = 0;
 
@@ -435,7 +435,7 @@ var emscriptenMemoryProfiler = {
   },
 
   printHeapResizeLog: function(heapResizes) {
-    var demangler = typeof demangleAll !== 'undefined' ? demangleAll : function(x) { return x; };
+    var demangler = typeof demangleAll != 'undefined' ? demangleAll : function(x) { return x; };
     var html = '';
     for (var i = 0; i < heapResizes.length; ++i) {
       var j = i+1;
@@ -487,7 +487,7 @@ var emscriptenMemoryProfiler = {
       self.canvas.width = document.documentElement.clientWidth - 32;
     }
 
-    if (typeof runtimeInitialized !== 'undefined' && !runtimeInitialized) {
+    if (typeof runtimeInitialized != 'undefined' && !runtimeInitialized) {
       return;
     }
     var stackBase = _emscripten_stack_get_base();
@@ -602,7 +602,7 @@ var emscriptenMemoryProfiler = {
       html += self.printHeapResizeLog(self.sbrkSources);
       html += '</div>'
     } else {
-      var demangler = typeof demangleAll !== 'undefined' ? demangleAll : function(x) { return x; };
+      var demangler = typeof demangleAll != 'undefined' ? demangleAll : function(x) { return x; };
       // Print out statistics of individual allocations if they were tracked.
       if (Object.keys(self.allocationsAtLoc).length > 0) {
         var calls = [];
@@ -632,6 +632,6 @@ var emscriptenMemoryProfiler = {
 // anymore!
 function memoryprofiler_add_hooks() { emscriptenMemoryProfiler.initialize(); }
 
-if (typeof Module !== 'undefined' && typeof document !== 'undefined' && typeof window !== 'undefined' && typeof process === 'undefined') emscriptenMemoryProfiler.initialize();
+if (typeof Module != 'undefined' && typeof document != 'undefined' && typeof window != 'undefined' && typeof process == 'undefined') emscriptenMemoryProfiler.initialize();
 
 #endif
diff --git a/src/modules.js b/src/modules.js
index f6440b59280f4..540c2b923873e 100644
--- a/src/modules.js
+++ b/src/modules.js
@@ -248,20 +248,20 @@ global.LibraryManager = {
         }
         continue;
       }
-      if (typeof lib[x] === 'string') {
+      if (typeof lib[x] == 'string') {
         let target = x;
-        while (typeof lib[target] === 'string') {
+        while (typeof lib[target] == 'string') {
           // ignore code and variable assignments, aliases are just simple names
           if (lib[target].search(/[=({; ]/) >= 0) continue libloop;
           target = lib[target];
         }
         if (!isNaN(target)) continue; // This is a number, and so cannot be an alias target.
-        if (typeof lib[target] === 'undefined' || typeof lib[target] === 'function') {
+        if (typeof lib[target] == 'undefined' || typeof lib[target] == 'function') {
           // When functions are aliased, a signature for the function must be
           // provided so that an efficient form of forwarding can be
           // implemented.
           function testStringType(sig) {
-            if (typeof lib[sig] !== 'undefined' && typeof typeof lib[sig] !== 'string') {
+            if (typeof lib[sig] != 'undefined' && typeof typeof lib[sig] != 'string') {
               error(`${sig} should be a string! (was ${typeof lib[sig]})`);
             }
           }
@@ -269,12 +269,12 @@ global.LibraryManager = {
           const targetSig = target + '__sig';
           testStringType(aliasSig);
           testStringType(targetSig);
-          if (typeof lib[aliasSig] === 'string' && typeof lib[targetSig] === 'string' && lib[aliasSig] != lib[targetSig]) {
+          if (typeof lib[aliasSig] == 'string' && typeof lib[targetSig] == 'string' && lib[aliasSig] != lib[targetSig]) {
             error(`${aliasSig} (${lib[aliasSig]}) differs from ${targetSig} (${lib[targetSig]})`);
           }
 
           const sig = lib[aliasSig] || lib[targetSig];
-          if (typeof sig !== 'string') {
+          if (typeof sig != 'string') {
             error(`Function ${x} aliases to target function ${target}, but neither the alias or the target provide a signature. Please add a ${targetSig}: 'vifj...' annotation or a ${aliasSig}: 'vifj...' annotation to describe the type of function forwarding that is needed!`);
           }
 
@@ -286,7 +286,7 @@ global.LibraryManager = {
             lib[targetSig] = lib[aliasSig];
           }
 
-          if (typeof lib[target] !== 'function') {
+          if (typeof lib[target] != 'function') {
             error(`no alias found for ${x}`);
           }
 
diff --git a/src/parseTools.js b/src/parseTools.js
index 25a18fc419c3d..8b0ea3f083a2b 100644
--- a/src/parseTools.js
+++ b/src/parseTools.js
@@ -259,7 +259,7 @@ function splitI64(value, floatConversion) {
 function indentify(text, indent) {
   // Don't try to indentify huge strings - we may run out of memory
   if (text.length > 1024 * 1024) return text;
-  if (typeof indent === 'number') {
+  if (typeof indent == 'number') {
     const len = indent;
     indent = '';
     for (let i = 0; i < len; i++) {
@@ -555,11 +555,11 @@ function getFastValue(a, op, b, type) {
 
   let aNumber = null;
   let bNumber = null;
-  if (typeof a === 'number') {
+  if (typeof a == 'number') {
     aNumber = a;
     a = a.toString();
   } else if (isNumber(a)) aNumber = parseFloat(a);
-  if (typeof b === 'number') {
+  if (typeof b == 'number') {
     bNumber = b;
     b = b.toString();
   } else if (isNumber(b)) bNumber = parseFloat(b);
@@ -896,7 +896,7 @@ function makeRetainedCompilerSettings() {
   for (const x in global) {
     if (!ignore.has(x) && x[0] !== '_' && x == x.toUpperCase()) {
       try {
-        if (typeof global[x] === 'number' || typeof global[x] === 'string' || this.isArray()) {
+        if (typeof global[x] == 'number' || typeof global[x] == 'string' || this.isArray()) {
           ret[x] = global[x];
         }
       } catch (e) {}
diff --git a/src/polyfill/objassign.js b/src/polyfill/objassign.js
index ebb9a43edd79e..c8991888f557a 100644
--- a/src/polyfill/objassign.js
+++ b/src/polyfill/objassign.js
@@ -5,7 +5,7 @@
 assert(false, "this file should never be included unless POLYFILL is set");
 #endif
 
-if (typeof Object.assign === 'undefined') {
+if (typeof Object.assign == 'undefined') {
   /**
    * Equivalent to the Object.assign() method, but guaranteed to be available for use in code
    * generated by the compiler.
diff --git a/src/polyfill/promise.js b/src/polyfill/promise.js
index ce7f0d24b5e87..55cfe10bc701f 100644
--- a/src/polyfill/promise.js
+++ b/src/polyfill/promise.js
@@ -46,7 +46,7 @@ var Promise = (function() {
   function Promise(fn) {
     if (!(this instanceof Promise))
       throw new TypeError('Promises must be constructed via new');
-    if (typeof fn !== 'function') throw new TypeError('not a function');
+    if (typeof fn != 'function') throw new TypeError('not a function');
     /** @type {!number} */
     this._state = 0;
     /** @type {!boolean} */
@@ -92,7 +92,7 @@ var Promise = (function() {
         throw new TypeError('A promise cannot be resolved with itself.');
       if (
         newValue &&
-        (typeof newValue === 'object' || typeof newValue === 'function')
+        (typeof newValue == 'object' || typeof newValue == 'function')
       ) {
         var then = newValue.then;
         if (newValue instanceof Promise) {
@@ -100,7 +100,7 @@ var Promise = (function() {
           self._value = newValue;
           finale(self);
           return;
-        } else if (typeof then === 'function') {
+        } else if (typeof then == 'function') {
           doResolve(bind(then, newValue), self);
           return;
         }
@@ -138,8 +138,8 @@ var Promise = (function() {
    * @constructor
    */
   function Handler(onFulfilled, onRejected, promise) {
-    this.onFulfilled = typeof onFulfilled === 'function' ? onFulfilled : null;
-    this.onRejected = typeof onRejected === 'function' ? onRejected : null;
+    this.onFulfilled = typeof onFulfilled == 'function' ? onFulfilled : null;
+    this.onRejected = typeof onRejected == 'function' ? onRejected : null;
     this.promise = promise;
   }
 
@@ -195,9 +195,9 @@ var Promise = (function() {
 
       function res(i, val) {
         try {
-          if (val && (typeof val === 'object' || typeof val === 'function')) {
+          if (val && (typeof val == 'object' || typeof val == 'function')) {
             var then = val.then;
-            if (typeof then === 'function') {
+            if (typeof then == 'function') {
               then.call(
                 val,
                 function(val) {
@@ -224,7 +224,7 @@ var Promise = (function() {
   };
 
   Promise.resolve = function(value) {
-    if (value && typeof value === 'object' && value.constructor === Promise) {
+    if (value && typeof value == 'object' && value.constructor == Promise) {
       return value;
     }
 
@@ -254,7 +254,7 @@ var Promise = (function() {
   // Use polyfill for setImmediate for performance gains
   Promise._immediateFn =
     // @ts-ignore
-    (typeof setImmediate === 'function' &&
+    (typeof setImmediate == 'function' &&
       function(fn) {
         // @ts-ignore
         setImmediate(fn);
@@ -264,7 +264,7 @@ var Promise = (function() {
     };
 
   Promise._unhandledRejectionFn = function _unhandledRejectionFn(err) {
-    if (typeof console !== 'undefined' && console) {
+    if (typeof console != 'undefined' && console) {
       console.warn('Possible Unhandled Promise Rejection:', err); // eslint-disable-line no-console
     }
   };
diff --git a/src/postamble_minimal.js b/src/postamble_minimal.js
index f145a923ffe49..2676c85c386cc 100644
--- a/src/postamble_minimal.js
+++ b/src/postamble_minimal.js
@@ -252,7 +252,7 @@ WebAssembly.instantiate(Module['wasm'], imports).then(function(output) {
 
 #if WASM == 2
 #if ENVIRONMENT_MAY_BE_NODE || ENVIRONMENT_MAY_BE_SHELL
-  if (typeof location !== 'undefined') {
+  if (typeof location != 'undefined') {
 #endif
     // WebAssembly compilation failed, try running the JS fallback instead.
     var search = location.search;
diff --git a/src/preamble.js b/src/preamble.js
index 9fb3bcbda71be..6cb195fcc1163 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -37,7 +37,7 @@ if (Module['doWasm2JS']) {
 #endif
 
 #if WASM == 1
-if (typeof WebAssembly !== 'object') {
+if (typeof WebAssembly != 'object') {
   abort('no native wasm support detected');
 }
 #endif
@@ -288,7 +288,7 @@ if (Module['TOTAL_STACK']) assert(TOTAL_STACK === Module['TOTAL_STACK'], 'the st
 assert(INITIAL_MEMORY >= TOTAL_STACK, 'INITIAL_MEMORY should be larger than TOTAL_STACK, was ' + INITIAL_MEMORY + '! (TOTAL_STACK=' + TOTAL_STACK + ')');
 
 // check for full engine support (use string 'subarray' to avoid closure compiler confusion)
-assert(typeof Int32Array !== 'undefined' && typeof Float64Array !== 'undefined' && Int32Array.prototype.subarray !== undefined && Int32Array.prototype.set !== undefined,
+assert(typeof Int32Array != 'undefined' && typeof Float64Array !== 'undefined' && Int32Array.prototype.subarray != undefined && Int32Array.prototype.set != undefined,
        'JS engine does not provide full typed array support');
 #endif
 
@@ -499,7 +499,7 @@ function addRunDependency(id) {
   if (id) {
     assert(!runDependencyTracking[id]);
     runDependencyTracking[id] = 1;
-    if (runDependencyWatcher === null && typeof setInterval !== 'undefined') {
+    if (runDependencyWatcher === null && typeof setInterval != 'undefined') {
       // Check for missing dependencies every few seconds
       runDependencyWatcher = setInterval(function() {
         if (ABORT) {
@@ -715,7 +715,7 @@ function instrumentWasmExportsWithAbort(exports) {
   var instExports = {};
   for (var name in exports) {
       var original = exports[name];
-      if (typeof original === 'function') {
+      if (typeof original == 'function') {
         instExports[name] = makeAbortWrapper(original);
       } else {
         instExports[name] = original;
@@ -838,7 +838,7 @@ function getBinaryPromise() {
   // Cordova or Electron apps are typically loaded from a file:// url.
   // So use fetch if it is available and the url is not a file, otherwise fall back to XHR.
   if (!wasmBinary && (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER)) {
-    if (typeof fetch === 'function'
+    if (typeof fetch == 'function'
 #if ENVIRONMENT_MAY_BE_WEBVIEW
       && !isFileURI(wasmBinaryFile)
 #endif
@@ -1153,7 +1153,7 @@ function createWasm() {
 
 #if WASM == 2
 #if ENVIRONMENT_MAY_BE_NODE || ENVIRONMENT_MAY_BE_SHELL
-      if (typeof location !== 'undefined') {
+      if (typeof location != 'undefined') {
 #endif
         // WebAssembly compilation failed, try running the JS fallback instead.
         var search = location.search;
@@ -1181,13 +1181,13 @@ function createWasm() {
 
   function instantiateAsync() {
     if (!wasmBinary &&
-        typeof WebAssembly.instantiateStreaming === 'function' &&
+        typeof WebAssembly.instantiateStreaming == 'function' &&
         !isDataURI(wasmBinaryFile) &&
 #if ENVIRONMENT_MAY_BE_WEBVIEW
         // Don't use streaming for file:// delivered objects in a webview, fetch them synchronously.
         !isFileURI(wasmBinaryFile) &&
 #endif
-        typeof fetch === 'function') {
+        typeof fetch == 'function') {
       return fetch(wasmBinaryFile, { credentials: 'same-origin' }).then(function (response) {
         // Suppress closure warning here since the upstream definition for
         // instantiateStreaming only allows Promise<Repsponse> rather than
diff --git a/src/proxyClient.js b/src/proxyClient.js
index 8e5067452025e..2275a66bd58cd 100644
--- a/src/proxyClient.js
+++ b/src/proxyClient.js
@@ -6,7 +6,7 @@
 
 // proxy to/from worker
 
-if (typeof Module === 'undefined') {
+if (typeof Module == 'undefined') {
   console.warn('no Module object defined - cannot proxy canvas rendering and input events, etc.');
   Module = {
     print: function(x) {
@@ -271,7 +271,7 @@ function cloneObject(event) {
   for (var x in event) {
     if (x == x.toUpperCase()) continue;
     var prop = event[x];
-    if (typeof prop === 'number' || typeof prop === 'string') ret[x] = prop;
+    if (typeof prop == 'number' || typeof prop == 'string') ret[x] = prop;
   }
   return ret;
 };
diff --git a/src/proxyWorker.js b/src/proxyWorker.js
index 496c7e60e5b2e..a8fbb70fe7a4e 100644
--- a/src/proxyWorker.js
+++ b/src/proxyWorker.js
@@ -4,23 +4,23 @@
  * SPDX-License-Identifier: MIT
  */
 
-if (typeof console === 'undefined') {
+if (typeof console == 'undefined') {
   // we can't call Module.printErr because that might be circular
   var console = {
     log: function(x) {
-      if (typeof dump === 'function') dump('log: ' + x + '\n');
+      if (typeof dump == 'function') dump('log: ' + x + '\n');
     },
     debug: function(x) {
-      if (typeof dump === 'function') dump('debug: ' + x + '\n');
+      if (typeof dump == 'function') dump('debug: ' + x + '\n');
     },
     info: function(x) {
-      if (typeof dump === 'function') dump('info: ' + x + '\n');
+      if (typeof dump == 'function') dump('info: ' + x + '\n');
     },
     warn: function(x) {
-      if (typeof dump === 'function') dump('warn: ' + x + '\n');
+      if (typeof dump == 'function') dump('warn: ' + x + '\n');
     },
     error: function(x) {
-      if (typeof dump === 'function') dump('error: ' + x + '\n');
+      if (typeof dump == 'function') dump('error: ' + x + '\n');
     },
   };
 }
@@ -511,7 +511,7 @@ if (!ENVIRONMENT_IS_PTHREAD) {
 
 // proxyWorker.js has defined 'document' and 'window' objects above, so need to
 // initialize them for library_html5.js explicitly here.
-if (typeof specialHTMLTargets !== 'undefined') {
+if (typeof specialHTMLTargets != 'undefined') {
   specialHTMLTargets = [0, document, window];
 }
 
diff --git a/src/runtime_debug.js b/src/runtime_debug.js
index dbe4ba4b7548b..b7ec162899d36 100644
--- a/src/runtime_debug.js
+++ b/src/runtime_debug.js
@@ -45,12 +45,12 @@ function prettyPrint(arg) {
     ret += 'f32:' + arr.toString().replace(/,/g, ',') + '}';
     return ret;
   }
-  if (typeof arg === 'function') {
+  if (typeof arg == 'function') {
     return '<function>';
-  } else if (typeof arg === 'object') {
+  } else if (typeof arg == 'object') {
     printObjectList.push(arg);
     return '<' + arg + '|' + (printObjectList.length-1) + '>';
-  } else if (typeof arg === 'number') {
+  } else if (typeof arg == 'number') {
     if (arg > 0) return '0x' + arg.toString(16) + ' (' + arg + ')';
   }
   return arg;
diff --git a/src/runtime_functions.js b/src/runtime_functions.js
index fa1a2d2afbb91..d638a41f55835 100644
--- a/src/runtime_functions.js
+++ b/src/runtime_functions.js
@@ -14,7 +14,7 @@ function convertJsFunctionToWasm(func, sig) {
   // "WebAssembly.Function" constructor.
   // Otherwise, construct a minimal wasm module importing the JS function and
   // re-exporting it.
-  if (typeof WebAssembly.Function === "function") {
+  if (typeof WebAssembly.Function == "function") {
     var typeNames = {
       'i': 'i32',
       'j': 'i64',
@@ -131,7 +131,7 @@ function updateTableMap(offset, count) {
  */
 function addFunction(func, sig) {
 #if ASSERTIONS
-  assert(typeof func !== 'undefined');
+  assert(typeof func != 'undefined');
 #endif // ASSERTIONS
 
   // Check if the function is already in the table, to ensure each function
@@ -166,7 +166,7 @@ function addFunction(func, sig) {
       throw err;
     }
 #if ASSERTIONS
-    assert(typeof sig !== 'undefined', 'Missing signature argument to addFunction: ' + func);
+    assert(typeof sig != 'undefined', 'Missing signature argument to addFunction: ' + func);
 #endif
     var wrapped = convertJsFunctionToWasm(func, sig);
     setWasmTableEntry(ret, wrapped);
diff --git a/src/runtime_legacy.js b/src/runtime_legacy.js
index 9b4b88cb23471..863f2a043a900 100644
--- a/src/runtime_legacy.js
+++ b/src/runtime_legacy.js
@@ -19,8 +19,8 @@ var ALLOC_STACK = 1; // Lives for the duration of the current function call
 function allocate(slab, allocator) {
   var ret;
 #if ASSERTIONS
-  assert(typeof allocator === 'number', 'allocate no longer takes a type argument')
-  assert(typeof slab !== 'number', 'allocate no longer takes a number as arg0')
+  assert(typeof allocator == 'number', 'allocate no longer takes a type argument')
+  assert(typeof slab != 'number', 'allocate no longer takes a number as arg0')
 #endif
 
   if (allocator == ALLOC_STACK) {
diff --git a/src/runtime_strings.js b/src/runtime_strings.js
index cb45fdf37c67e..3b10d6c3eb3dd 100644
--- a/src/runtime_strings.js
+++ b/src/runtime_strings.js
@@ -39,7 +39,7 @@ function TextDecoderWrapper(encoding) {
 var UTF8Decoder = new TextDecoder{{{ USE_PTHREADS ? 'Wrapper' : ''}}}('utf8');
 #else // TEXTDECODER == 2
 #if TEXTDECODER
-var UTF8Decoder = typeof TextDecoder !== 'undefined' ? new TextDecoder{{{ USE_PTHREADS ? 'Wrapper' : ''}}}('utf8') : undefined;
+var UTF8Decoder = typeof TextDecoder != 'undefined' ? new TextDecoder{{{ USE_PTHREADS ? 'Wrapper' : ''}}}('utf8') : undefined;
 #endif // TEXTDECODER
 #endif // TEXTDECODER == 2
 
diff --git a/src/runtime_strings_extra.js b/src/runtime_strings_extra.js
index c9d33a707ebf9..e471aaab37f02 100644
--- a/src/runtime_strings_extra.js
+++ b/src/runtime_strings_extra.js
@@ -35,7 +35,7 @@ function stringToAscii(str, outPtr) {
 var UTF16Decoder = new TextDecoder{{{ USE_PTHREADS ? 'Wrapper' : ''}}}('utf-16le');
 #else // TEXTDECODER == 2
 #if TEXTDECODER
-var UTF16Decoder = typeof TextDecoder !== 'undefined' ? new TextDecoder{{{ USE_PTHREADS ? 'Wrapper' : ''}}}('utf-16le') : undefined;
+var UTF16Decoder = typeof TextDecoder != 'undefined' ? new TextDecoder{{{ USE_PTHREADS ? 'Wrapper' : ''}}}('utf-16le') : undefined;
 #endif // TEXTDECODER
 #endif // TEXTDECODER == 2
 
diff --git a/src/shell.js b/src/shell.js
index 8bbc1748469e6..408a64cf669ec 100644
--- a/src/shell.js
+++ b/src/shell.js
@@ -36,7 +36,7 @@ var /** @type {{
  */ Module;
 if (!Module) /** @suppress{checkTypes}*/Module = {"__EMSCRIPTEN_PRIVATE_MODULE_EXPORT_NAME_SUBSTITUTION__":1};
 #else
-var Module = typeof {{{ EXPORT_NAME }}} !== 'undefined' ? {{{ EXPORT_NAME }}} : {};
+var Module = typeof {{{ EXPORT_NAME }}} != 'undefined' ? {{{ EXPORT_NAME }}} : {};
 #endif // USE_CLOSURE_COMPILER
 
 #if POLYFILL
@@ -89,7 +89,7 @@ var quit_ = (status, toThrow) => {
 var ENVIRONMENT_IS_WEB = {{{ ENVIRONMENT === 'web' }}};
 #if USE_PTHREADS && ENVIRONMENT_MAY_BE_NODE
 // node+pthreads always supports workers; detect which we are at runtime
-var ENVIRONMENT_IS_WORKER = typeof importScripts === 'function';
+var ENVIRONMENT_IS_WORKER = typeof importScripts == 'function';
 #else
 var ENVIRONMENT_IS_WORKER = {{{ ENVIRONMENT === 'worker' }}};
 #endif
@@ -97,11 +97,11 @@ var ENVIRONMENT_IS_NODE = {{{ ENVIRONMENT === 'node' }}};
 var ENVIRONMENT_IS_SHELL = {{{ ENVIRONMENT === 'shell' }}};
 #else // ENVIRONMENT
 // Attempt to auto-detect the environment
-var ENVIRONMENT_IS_WEB = typeof window === 'object';
-var ENVIRONMENT_IS_WORKER = typeof importScripts === 'function';
+var ENVIRONMENT_IS_WEB = typeof window == 'object';
+var ENVIRONMENT_IS_WORKER = typeof importScripts == 'function';
 // N.b. Electron.js environment is simultaneously a NODE-environment, but
 // also a web environment.
-var ENVIRONMENT_IS_NODE = typeof process === 'object' && typeof process.versions === 'object' && typeof process.versions.node === 'string';
+var ENVIRONMENT_IS_NODE = typeof process == 'object' && typeof process.versions == 'object' && typeof process.versions.node == 'string';
 var ENVIRONMENT_IS_SHELL = !ENVIRONMENT_IS_WEB && !ENVIRONMENT_IS_NODE && !ENVIRONMENT_IS_WORKER;
 #endif // ENVIRONMENT
 
@@ -127,7 +127,7 @@ var ENVIRONMENT_IS_PTHREAD = Module['ENVIRONMENT_IS_PTHREAD'] || false;
 #if EXPORT_ES6
 var _scriptDir = import.meta.url;
 #else
-var _scriptDir = (typeof document !== 'undefined' && document.currentScript) ? document.currentScript.src : undefined;
+var _scriptDir = (typeof document != 'undefined' && document.currentScript) ? document.currentScript.src : undefined;
 
 if (ENVIRONMENT_IS_WORKER) {
   _scriptDir = self.location.href;
@@ -169,7 +169,7 @@ function logExceptionOnExit(e) {
   if (e instanceof ExitStatus) return;
   let toLog = e;
 #if ASSERTIONS
-  if (e && typeof e === 'object' && e.stack) {
+  if (e && typeof e == 'object' && e.stack) {
     toLog = [e, e.stack];
   }
 #endif
@@ -185,7 +185,7 @@ var requireNodeFS;
 if (ENVIRONMENT_IS_NODE) {
 #if ENVIRONMENT
 #if ASSERTIONS
-  if (!(typeof process === 'object' && typeof require === 'function')) throw new Error('not compiled for this environment (did you build to HTML and try to run it not on the web, or set ENVIRONMENT to something - like node - and run it someplace else - like on the web?)');
+  if (!(typeof process == 'object' && typeof require == 'function')) throw new Error('not compiled for this environment (did you build to HTML and try to run it not on the web, or set ENVIRONMENT to something - like node - and run it someplace else - like on the web?)');
 #endif
 #endif
   if (ENVIRONMENT_IS_WORKER) {
@@ -205,7 +205,7 @@ if (ENVIRONMENT_IS_NODE) {
 #if MODULARIZE
   // MODULARIZE will export the module in the proper place outside, we don't need to export here
 #else
-  if (typeof module !== 'undefined') {
+  if (typeof module != 'undefined') {
     module['exports'] = Module;
   }
 #endif
@@ -252,7 +252,7 @@ if (ENVIRONMENT_IS_NODE) {
 
 #if WASM == 2
   // If target shell does not support Wasm, load the JS version of the code.
-  if (typeof WebAssembly === 'undefined') {
+  if (typeof WebAssembly == 'undefined') {
     requireNodeFS();
     eval(fs.readFileSync(locateFile('{{{ TARGET_BASENAME }}}.wasm.js'))+'');
   }
@@ -265,7 +265,7 @@ if (ENVIRONMENT_IS_SHELL) {
 
 #if ENVIRONMENT
 #if ASSERTIONS
-  if ((typeof process === 'object' && typeof require === 'function') || typeof window === 'object' || typeof importScripts === 'function') throw new Error('not compiled for this environment (did you build to HTML and try to run it not on the web, or set ENVIRONMENT to something - like node - and run it someplace else - like on the web?)');
+  if ((typeof process == 'object' && typeof require === 'function') || typeof window == 'object' || typeof importScripts == 'function') throw new Error('not compiled for this environment (did you build to HTML and try to run it not on the web, or set ENVIRONMENT to something - like node - and run it someplace else - like on the web?)');
 #endif
 #endif
 
@@ -289,11 +289,11 @@ if (ENVIRONMENT_IS_SHELL) {
       return data;
     }
 #endif
-    if (typeof readbuffer === 'function') {
+    if (typeof readbuffer == 'function') {
       return new Uint8Array(readbuffer(f));
     }
     data = read(f, 'binary');
-    assert(typeof data === 'object');
+    assert(typeof data == 'object');
     return data;
   };
 
@@ -307,23 +307,23 @@ if (ENVIRONMENT_IS_SHELL) {
     arguments_ = arguments;
   }
 
-  if (typeof quit === 'function') {
+  if (typeof quit == 'function') {
     quit_ = (status, toThrow) => {
       logExceptionOnExit(toThrow);
       quit(status);
     };
   }
 
-  if (typeof print !== 'undefined') {
+  if (typeof print != 'undefined') {
     // Prefer to use print/printErr where they exist, as they usually work better.
-    if (typeof console === 'undefined') console = /** @type{!Console} */({});
+    if (typeof console == 'undefined') console = /** @type{!Console} */({});
     console.log = /** @type{!function(this:Console, ...*): undefined} */ (print);
-    console.warn = console.error = /** @type{!function(this:Console, ...*): undefined} */ (typeof printErr !== 'undefined' ? printErr : print);
+    console.warn = console.error = /** @type{!function(this:Console, ...*): undefined} */ (typeof printErr != 'undefined' ? printErr : print);
   }
 
 #if WASM == 2
   // If target shell does not support Wasm, load the JS version of the code.
-  if (typeof WebAssembly === 'undefined') {
+  if (typeof WebAssembly == 'undefined') {
     eval(read(locateFile('{{{ TARGET_BASENAME }}}.wasm.js'))+'');
   }
 #endif
@@ -338,7 +338,7 @@ if (ENVIRONMENT_IS_SHELL) {
 if (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER) {
   if (ENVIRONMENT_IS_WORKER) { // Check worker, not web, since window could be polyfilled
     scriptDirectory = self.location.href;
-  } else if (typeof document !== 'undefined' && document.currentScript) { // web
+  } else if (typeof document != 'undefined' && document.currentScript) { // web
     scriptDirectory = document.currentScript.src;
   }
 #if MODULARIZE
@@ -362,7 +362,7 @@ if (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER) {
 
 #if ENVIRONMENT
 #if ASSERTIONS
-  if (!(typeof window === 'object' || typeof importScripts === 'function')) throw new Error('not compiled for this environment (did you build to HTML and try to run it not on the web, or set ENVIRONMENT to something - like node - and run it someplace else - like on the web?)');
+  if (!(typeof window == 'object' || typeof importScripts == 'function')) throw new Error('not compiled for this environment (did you build to HTML and try to run it not on the web, or set ENVIRONMENT to something - like node - and run it someplace else - like on the web?)');
 #endif
 #endif
 
@@ -388,7 +388,7 @@ if (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER) {
 if (ENVIRONMENT_IS_NODE) {
   // Polyfill the performance object, which emscripten pthreads support
   // depends on for good timing.
-  if (typeof performance === 'undefined') {
+  if (typeof performance == 'undefined') {
     global.performance = require('perf_hooks').performance;
   }
 }
@@ -430,15 +430,15 @@ moduleOverrides = null;
 // perform assertions in shell.js after we set up out() and err(), as otherwise if an assertion fails it cannot print the message
 #if ASSERTIONS
 // Assertions on removed incoming Module JS APIs.
-assert(typeof Module['memoryInitializerPrefixURL'] === 'undefined', 'Module.memoryInitializerPrefixURL option was removed, use Module.locateFile instead');
-assert(typeof Module['pthreadMainPrefixURL'] === 'undefined', 'Module.pthreadMainPrefixURL option was removed, use Module.locateFile instead');
-assert(typeof Module['cdInitializerPrefixURL'] === 'undefined', 'Module.cdInitializerPrefixURL option was removed, use Module.locateFile instead');
-assert(typeof Module['filePackagePrefixURL'] === 'undefined', 'Module.filePackagePrefixURL option was removed, use Module.locateFile instead');
-assert(typeof Module['read'] === 'undefined', 'Module.read option was removed (modify read_ in JS)');
-assert(typeof Module['readAsync'] === 'undefined', 'Module.readAsync option was removed (modify readAsync in JS)');
-assert(typeof Module['readBinary'] === 'undefined', 'Module.readBinary option was removed (modify readBinary in JS)');
-assert(typeof Module['setWindowTitle'] === 'undefined', 'Module.setWindowTitle option was removed (modify setWindowTitle in JS)');
-assert(typeof Module['TOTAL_MEMORY'] === 'undefined', 'Module.TOTAL_MEMORY has been renamed Module.INITIAL_MEMORY');
+assert(typeof Module['memoryInitializerPrefixURL'] == 'undefined', 'Module.memoryInitializerPrefixURL option was removed, use Module.locateFile instead');
+assert(typeof Module['pthreadMainPrefixURL'] == 'undefined', 'Module.pthreadMainPrefixURL option was removed, use Module.locateFile instead');
+assert(typeof Module['cdInitializerPrefixURL'] == 'undefined', 'Module.cdInitializerPrefixURL option was removed, use Module.locateFile instead');
+assert(typeof Module['filePackagePrefixURL'] == 'undefined', 'Module.filePackagePrefixURL option was removed, use Module.locateFile instead');
+assert(typeof Module['read'] == 'undefined', 'Module.read option was removed (modify read_ in JS)');
+assert(typeof Module['readAsync'] == 'undefined', 'Module.readAsync option was removed (modify readAsync in JS)');
+assert(typeof Module['readBinary'] == 'undefined', 'Module.readBinary option was removed (modify readBinary in JS)');
+assert(typeof Module['setWindowTitle'] == 'undefined', 'Module.setWindowTitle option was removed (modify setWindowTitle in JS)');
+assert(typeof Module['TOTAL_MEMORY'] == 'undefined', 'Module.TOTAL_MEMORY has been renamed Module.INITIAL_MEMORY');
 {{{ makeRemovedModuleAPIAssert('read', 'read_') }}}
 {{{ makeRemovedModuleAPIAssert('readAsync') }}}
 {{{ makeRemovedModuleAPIAssert('readBinary') }}}
diff --git a/src/shell_minimal.js b/src/shell_minimal.js
index 8384993c8bc57..d317aa61eb1a6 100644
--- a/src/shell_minimal.js
+++ b/src/shell_minimal.js
@@ -25,11 +25,11 @@ Module['ready'] = new Promise((resolve, reject) => {
 #endif
 
 #if ENVIRONMENT_MAY_BE_NODE
-var ENVIRONMENT_IS_NODE = typeof process === 'object';
+var ENVIRONMENT_IS_NODE = typeof process == 'object';
 #endif
 
 #if ENVIRONMENT_MAY_BE_SHELL
-var ENVIRONMENT_IS_SHELL = typeof read === 'function';
+var ENVIRONMENT_IS_SHELL = typeof read == 'function';
 #endif
 
 #if ASSERTIONS || USE_PTHREADS
@@ -59,7 +59,7 @@ if (ENVIRONMENT_IS_NODE && ENVIRONMENT_IS_SHELL) {
 if (ENVIRONMENT_IS_NODE) {
   var fs = require('fs');
 #if WASM == 2
-  if (typeof WebAssembly !== 'undefined') Module['wasm'] = fs.readFileSync(__dirname + '/{{{ TARGET_BASENAME }}}.wasm');
+  if (typeof WebAssembly != 'undefined') Module['wasm'] = fs.readFileSync(__dirname + '/{{{ TARGET_BASENAME }}}.wasm');
   else eval(fs.readFileSync(__dirname + '/{{{ TARGET_BASENAME }}}.wasm.js')+'');
 #else
 #if !WASM2JS
@@ -75,7 +75,7 @@ if (ENVIRONMENT_IS_NODE) {
 #if ENVIRONMENT_MAY_BE_SHELL && ((WASM == 1 && (!WASM2JS || !MEM_INIT_IN_WASM)) || WASM == 2)
 if (ENVIRONMENT_IS_SHELL) {
 #if WASM == 2
-  if (typeof WebAssembly !== 'undefined') Module['wasm'] = read('{{{ TARGET_BASENAME }}}.wasm', 'binary');
+  if (typeof WebAssembly != 'undefined') Module['wasm'] = read('{{{ TARGET_BASENAME }}}.wasm', 'binary');
   else eval(read('{{{ TARGET_BASENAME }}}.wasm.js')+'');
 #else
 #if !WASM2JS
@@ -142,14 +142,14 @@ function ready() {
 #if !MODULARIZE
 // In MODULARIZE mode _scriptDir needs to be captured already at the very top of the page immediately when the page is parsed, so it is generated there
 // before the page load. In non-MODULARIZE modes generate it here.
-var _scriptDir = (typeof document !== 'undefined' && document.currentScript) ? document.currentScript.src : undefined;
+var _scriptDir = (typeof document != 'undefined' && document.currentScript) ? document.currentScript.src : undefined;
 #endif
 
 // MINIMAL_RUNTIME does not support --proxy-to-worker option, so Worker and Pthread environments
 // coincide.
-var ENVIRONMENT_IS_WORKER = ENVIRONMENT_IS_PTHREAD = typeof importScripts === 'function';
+var ENVIRONMENT_IS_WORKER = ENVIRONMENT_IS_PTHREAD = typeof importScripts == 'function';
 
-var currentScriptUrl = typeof _scriptDir !== 'undefined' ? _scriptDir : ((typeof document !== 'undefined' && document.currentScript) ? document.currentScript.src : undefined);
+var currentScriptUrl = typeof _scriptDir != 'undefined' ? _scriptDir : ((typeof document != 'undefined' && document.currentScript) ? document.currentScript.src : undefined);
 #endif // USE_PTHREADS
 
 {{BODY}}
diff --git a/src/source_map_support.js b/src/source_map_support.js
index 87b1061610b97..0b59e1bf08aff 100644
--- a/src/source_map_support.js
+++ b/src/source_map_support.js
@@ -109,7 +109,7 @@ function getSourceMap() {
 }
 
 function getSourceMapPromise() {
-  if ((ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER) && typeof fetch === 'function') {
+  if ((ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER) && typeof fetch == 'function') {
     return fetch(wasmSourceMapFile, { credentials: 'same-origin' }).then(function(response) {
       return response['json']();
     }).catch(function () {
diff --git a/src/threadprofiler.js b/src/threadprofiler.js
index 07e3e250c5347..6ff8daca453c2 100644
--- a/src/threadprofiler.js
+++ b/src/threadprofiler.js
@@ -52,7 +52,7 @@ var emscriptenThreadProfiler = {
   },
 
   updateUi: function updateUi() {
-    if (typeof PThread === 'undefined') {
+    if (typeof PThread == 'undefined') {
       // Likely running threadprofiler on a singlethreaded build, or not
       // initialized yet, ignore updating.
       return;
@@ -97,10 +97,10 @@ var emscriptenThreadProfiler = {
   }
 };
 
-if (typeof Module !== 'undefined') {
-  if (typeof document !== 'undefined') {
+if (typeof Module != 'undefined') {
+  if (typeof document != 'undefined') {
     emscriptenThreadProfiler.initialize();
-  } else if (!ENVIRONMENT_IS_PTHREAD && typeof process !== 'undefined') {
+  } else if (!ENVIRONMENT_IS_PTHREAD && typeof process != 'undefined') {
     emscriptenThreadProfiler.initializeNode();
   }
 }
diff --git a/src/utility.js b/src/utility.js
index af5ecf8cbffc9..d4fcde8e88c4c 100644
--- a/src/utility.js
+++ b/src/utility.js
@@ -16,7 +16,7 @@ function safeQuote(x) {
 function dump(item) {
   let funcData;
   try {
-    if (typeof item == 'object' && item !== null && item.funcData) {
+    if (typeof item == 'object' && item != null && item.funcData) {
       funcData = item.funcData;
       item.funcData = null;
     }
@@ -26,7 +26,7 @@ function dump(item) {
     for (const i in item) {
       if (Object.prototype.hasOwnProperty.call(item, i)) {
         const j = item[i];
-        if (typeof j === 'string' || typeof j === 'number') {
+        if (typeof j == 'string' || typeof j == 'number') {
           ret.push(i + ': ' + j);
         } else {
           ret.push(i + ': [?]');
@@ -98,7 +98,7 @@ function mergeInto(obj, other) {
 
 function isNumber(x) {
   // XXX this does not handle 0xabc123 etc. We should likely also do x == parseInt(x) (which handles that), and remove hack |// handle 0x... as well|
-  return x == parseFloat(x) || (typeof x == 'string' && x.match(/^-?\d+$/)) || x === 'NaN';
+  return x == parseFloat(x) || (typeof x == 'string' && x.match(/^-?\d+$/)) || x == 'NaN';
 }
 
 function isJsLibraryConfigIdentifier(ident) {
diff --git a/src/webGLWorker.js b/src/webGLWorker.js
index e13c5c89a2040..f7761e03460d3 100644
--- a/src/webGLWorker.js
+++ b/src/webGLWorker.js
@@ -867,7 +867,7 @@ function WebGLWorker() {
   };
   function duplicate(something) {
     // clone data properly: handles numbers, null, typed arrays, js arrays and array buffers
-    if (!something || typeof something === 'number') return something;
+    if (!something || typeof something == 'number') return something;
     if (something.slice) return something.slice(0); // ArrayBuffer or js array
     return new something.constructor(something); // typed array
   }
diff --git a/src/worker.js b/src/worker.js
index 1358229103873..0283ccc3ea41e 100644
--- a/src/worker.js
+++ b/src/worker.js
@@ -14,7 +14,7 @@ var Module = {};
 
 #if ENVIRONMENT_MAY_BE_NODE
 // Node.js support
-var ENVIRONMENT_IS_NODE = typeof process === 'object' && typeof process.versions === 'object' && typeof process.versions.node === 'string';
+var ENVIRONMENT_IS_NODE = typeof process == 'object' && typeof process.versions == 'object' && typeof process.versions.node == 'string';
 if (ENVIRONMENT_IS_NODE) {
   // Create as web-worker-like an environment as we can.
 
@@ -156,9 +156,9 @@ self.onmessage = (e) => {
         Module = instance;
       });
 #else
-      if (typeof e.data.urlOrBlob === 'string') {
+      if (typeof e.data.urlOrBlob == 'string') {
 #if TRUSTED_TYPES
-        if (typeof self.trustedTypes !== 'undefined' && self.trustedTypes.createPolicy) {
+        if (typeof self.trustedTypes != 'undefined' && self.trustedTypes.createPolicy) {
           var p = self.trustedTypes.createPolicy('emscripten#workerPolicy3', { createScriptURL: function(ignored) { return e.data.urlOrBlob } });
           importScripts(p.createScriptURL('ignored'));
         } else
@@ -167,7 +167,7 @@ self.onmessage = (e) => {
       } else {
         var objectUrl = URL.createObjectURL(e.data.urlOrBlob);
 #if TRUSTED_TYPES
-        if (typeof self.trustedTypes !== 'undefined' && self.trustedTypes.createPolicy) {
+        if (typeof self.trustedTypes != 'undefined' && self.trustedTypes.createPolicy) {
           var p = self.trustedTypes.createPolicy('emscripten#workerPolicy3', { createScriptURL: function(ignored) { return objectUrl } });
           importScripts(p.createScriptURL('ignored'));
         } else
diff --git a/tests/code_size/hello_webgl2_wasm.json b/tests/code_size/hello_webgl2_wasm.json
index c086bb8ed68c4..acd07b7f8228a 100644
--- a/tests/code_size/hello_webgl2_wasm.json
+++ b/tests/code_size/hello_webgl2_wasm.json
@@ -1,10 +1,10 @@
 {
   "a.html": 569,
   "a.html.gz": 379,
-  "a.js": 4974,
-  "a.js.gz": 2418,
+  "a.js": 4973,
+  "a.js.gz": 2417,
   "a.wasm": 10440,
   "a.wasm.gz": 6666,
-  "total": 15983,
-  "total_gz": 9463
+  "total": 15982,
+  "total_gz": 9462
 }
diff --git a/tests/code_size/hello_webgl2_wasm2js.json b/tests/code_size/hello_webgl2_wasm2js.json
index 7cefaa2835731..690c20403a46a 100644
--- a/tests/code_size/hello_webgl2_wasm2js.json
+++ b/tests/code_size/hello_webgl2_wasm2js.json
@@ -1,10 +1,10 @@
 {
   "a.html": 594,
   "a.html.gz": 389,
-  "a.js": 20090,
-  "a.js.gz": 8209,
+  "a.js": 20089,
+  "a.js.gz": 8208,
   "a.mem": 3171,
   "a.mem.gz": 2714,
-  "total": 23855,
-  "total_gz": 11312
+  "total": 23854,
+  "total_gz": 11311
 }
diff --git a/tests/code_size/hello_webgl_wasm.json b/tests/code_size/hello_webgl_wasm.json
index 73994feeb885f..120c62bf93ce7 100644
--- a/tests/code_size/hello_webgl_wasm.json
+++ b/tests/code_size/hello_webgl_wasm.json
@@ -1,10 +1,10 @@
 {
   "a.html": 569,
   "a.html.gz": 379,
-  "a.js": 4480,
-  "a.js.gz": 2251,
+  "a.js": 4479,
+  "a.js.gz": 2250,
   "a.wasm": 10440,
   "a.wasm.gz": 6666,
-  "total": 15489,
-  "total_gz": 9296
+  "total": 15488,
+  "total_gz": 9295
 }
diff --git a/tests/code_size/hello_webgl_wasm2js.json b/tests/code_size/hello_webgl_wasm2js.json
index 57f041cd0c610..7a014eefc19a3 100644
--- a/tests/code_size/hello_webgl_wasm2js.json
+++ b/tests/code_size/hello_webgl_wasm2js.json
@@ -1,10 +1,10 @@
 {
   "a.html": 594,
   "a.html.gz": 389,
-  "a.js": 19575,
+  "a.js": 19574,
   "a.js.gz": 8046,
   "a.mem": 3171,
   "a.mem.gz": 2714,
-  "total": 23340,
+  "total": 23339,
   "total_gz": 11149
 }
diff --git a/tests/other/metadce/hello_libcxx_O2.jssize b/tests/other/metadce/hello_libcxx_O2.jssize
index 85575626eb06d..3aa84474d6042 100644
--- a/tests/other/metadce/hello_libcxx_O2.jssize
+++ b/tests/other/metadce/hello_libcxx_O2.jssize
@@ -1 +1 @@
-96770
+96724
diff --git a/tests/other/metadce/hello_libcxx_O2_EVAL_CTORS.jssize b/tests/other/metadce/hello_libcxx_O2_EVAL_CTORS.jssize
index 85575626eb06d..3aa84474d6042 100644
--- a/tests/other/metadce/hello_libcxx_O2_EVAL_CTORS.jssize
+++ b/tests/other/metadce/hello_libcxx_O2_EVAL_CTORS.jssize
@@ -1 +1 @@
-96770
+96724
diff --git a/tests/other/metadce/hello_libcxx_O2_EVAL_CTORS_2.jssize b/tests/other/metadce/hello_libcxx_O2_EVAL_CTORS_2.jssize
index 9f5a9bae37ded..f1a4e38c91035 100644
--- a/tests/other/metadce/hello_libcxx_O2_EVAL_CTORS_2.jssize
+++ b/tests/other/metadce/hello_libcxx_O2_EVAL_CTORS_2.jssize
@@ -1 +1 @@
-96668
+96622
diff --git a/tests/other/metadce/hello_libcxx_O2_fexceptions.jssize b/tests/other/metadce/hello_libcxx_O2_fexceptions.jssize
index 66985d1bad13f..4e59fe58e899e 100644
--- a/tests/other/metadce/hello_libcxx_O2_fexceptions.jssize
+++ b/tests/other/metadce/hello_libcxx_O2_fexceptions.jssize
@@ -1 +1 @@
-110224
+110178
diff --git a/tests/other/metadce/hello_libcxx_O2_fexceptions_DEMANGLE_SUPPORT.jssize b/tests/other/metadce/hello_libcxx_O2_fexceptions_DEMANGLE_SUPPORT.jssize
index 6d62d0ff8d7f5..76dd6ea822339 100644
--- a/tests/other/metadce/hello_libcxx_O2_fexceptions_DEMANGLE_SUPPORT.jssize
+++ b/tests/other/metadce/hello_libcxx_O2_fexceptions_DEMANGLE_SUPPORT.jssize
@@ -1 +1 @@
-111211
+111165
diff --git a/tests/other/metadce/hello_world.jssize b/tests/other/metadce/hello_world.jssize
index 6f29c73bb1179..82289c25bc5eb 100644
--- a/tests/other/metadce/hello_world.jssize
+++ b/tests/other/metadce/hello_world.jssize
@@ -1 +1 @@
-126200
+125971
diff --git a/tests/other/metadce/hello_world_O1.jssize b/tests/other/metadce/hello_world_O1.jssize
index 480d48278b1f9..7fcd30f3aed8c 100644
--- a/tests/other/metadce/hello_world_O1.jssize
+++ b/tests/other/metadce/hello_world_O1.jssize
@@ -1 +1 @@
-58972
+58956
diff --git a/tests/other/metadce/hello_world_O2.jssize b/tests/other/metadce/hello_world_O2.jssize
index 94f71beeac912..ad1c0201ef68e 100644
--- a/tests/other/metadce/hello_world_O2.jssize
+++ b/tests/other/metadce/hello_world_O2.jssize
@@ -1 +1 @@
-22051
+22035
diff --git a/tests/other/metadce/hello_world_O3.jssize b/tests/other/metadce/hello_world_O3.jssize
index db290bd738f16..face90461f220 100644
--- a/tests/other/metadce/hello_world_O3.jssize
+++ b/tests/other/metadce/hello_world_O3.jssize
@@ -1 +1 @@
-15396
+15382
diff --git a/tests/other/metadce/hello_world_O3_MAIN_MODULE_2.jssize b/tests/other/metadce/hello_world_O3_MAIN_MODULE_2.jssize
index 910bf30da431c..12fde61a51abf 100644
--- a/tests/other/metadce/hello_world_O3_MAIN_MODULE_2.jssize
+++ b/tests/other/metadce/hello_world_O3_MAIN_MODULE_2.jssize
@@ -1 +1 @@
-96935
+96888
diff --git a/tests/other/metadce/hello_world_Os.jssize b/tests/other/metadce/hello_world_Os.jssize
index 5a2287d489b1c..52598d0388621 100644
--- a/tests/other/metadce/hello_world_Os.jssize
+++ b/tests/other/metadce/hello_world_Os.jssize
@@ -1 +1 @@
-15193
+15179
diff --git a/tests/other/metadce/hello_world_Os_EXPORTED_FUNCTIONS_NONE.jssize b/tests/other/metadce/hello_world_Os_EXPORTED_FUNCTIONS_NONE.jssize
index 8a6e22b20216a..690f47724ce6b 100644
--- a/tests/other/metadce/hello_world_Os_EXPORTED_FUNCTIONS_NONE.jssize
+++ b/tests/other/metadce/hello_world_Os_EXPORTED_FUNCTIONS_NONE.jssize
@@ -1 +1 @@
-11919
+11906
diff --git a/tests/other/metadce/hello_world_Oz.jssize b/tests/other/metadce/hello_world_Oz.jssize
index 229e82d3c9290..f14659634d305 100644
--- a/tests/other/metadce/hello_world_Oz.jssize
+++ b/tests/other/metadce/hello_world_Oz.jssize
@@ -1 +1 @@
-15068
+15054
diff --git a/tests/other/metadce/libcxxabi_message_O3.jssize b/tests/other/metadce/libcxxabi_message_O3.jssize
index 9a14e64250b07..500a38ba43566 100644
--- a/tests/other/metadce/libcxxabi_message_O3.jssize
+++ b/tests/other/metadce/libcxxabi_message_O3.jssize
@@ -1 +1 @@
-13249
+13236
diff --git a/tests/other/metadce/libcxxabi_message_O3_STANDALONE_WASM.jssize b/tests/other/metadce/libcxxabi_message_O3_STANDALONE_WASM.jssize
index a9414b3366a6b..e75c331129b33 100644
--- a/tests/other/metadce/libcxxabi_message_O3_STANDALONE_WASM.jssize
+++ b/tests/other/metadce/libcxxabi_message_O3_STANDALONE_WASM.jssize
@@ -1 +1 @@
-14936
+14922
diff --git a/tests/other/metadce/mem_O3.jssize b/tests/other/metadce/mem_O3.jssize
index 649f59d1841e1..1f1660ff0442e 100644
--- a/tests/other/metadce/mem_O3.jssize
+++ b/tests/other/metadce/mem_O3.jssize
@@ -1 +1 @@
-15374
+15361
diff --git a/tests/other/metadce/mem_O3_ALLOW_MEMORY_GROWTH.jssize b/tests/other/metadce/mem_O3_ALLOW_MEMORY_GROWTH.jssize
index 6de4db93a50ae..2d0c4acaacdc8 100644
--- a/tests/other/metadce/mem_O3_ALLOW_MEMORY_GROWTH.jssize
+++ b/tests/other/metadce/mem_O3_ALLOW_MEMORY_GROWTH.jssize
@@ -1 +1 @@
-16125
+16112
diff --git a/tests/other/metadce/mem_O3_ALLOW_MEMORY_GROWTH_STANDALONE_WASM.jssize b/tests/other/metadce/mem_O3_ALLOW_MEMORY_GROWTH_STANDALONE_WASM.jssize
index 95d67656cfd47..5e4c356b15b41 100644
--- a/tests/other/metadce/mem_O3_ALLOW_MEMORY_GROWTH_STANDALONE_WASM.jssize
+++ b/tests/other/metadce/mem_O3_ALLOW_MEMORY_GROWTH_STANDALONE_WASM.jssize
@@ -1 +1 @@
-15831
+15817
diff --git a/tests/other/metadce/mem_O3_STANDALONE_WASM.jssize b/tests/other/metadce/mem_O3_STANDALONE_WASM.jssize
index 0ba8ca2ca1ad5..ee14455c7ba9f 100644
--- a/tests/other/metadce/mem_O3_STANDALONE_WASM.jssize
+++ b/tests/other/metadce/mem_O3_STANDALONE_WASM.jssize
@@ -1 +1 @@
-15653
+15639
diff --git a/tests/other/metadce/mem_no_argv_O3_STANDALONE_WASM.jssize b/tests/other/metadce/mem_no_argv_O3_STANDALONE_WASM.jssize
index a9414b3366a6b..e75c331129b33 100644
--- a/tests/other/metadce/mem_no_argv_O3_STANDALONE_WASM.jssize
+++ b/tests/other/metadce/mem_no_argv_O3_STANDALONE_WASM.jssize
@@ -1 +1 @@
-14936
+14922
diff --git a/tests/other/metadce/mem_no_argv_O3_STANDALONE_WASM_flto.jssize b/tests/other/metadce/mem_no_argv_O3_STANDALONE_WASM_flto.jssize
index a9414b3366a6b..e75c331129b33 100644
--- a/tests/other/metadce/mem_no_argv_O3_STANDALONE_WASM_flto.jssize
+++ b/tests/other/metadce/mem_no_argv_O3_STANDALONE_WASM_flto.jssize
@@ -1 +1 @@
-14936
+14922
diff --git a/tests/other/metadce/mem_no_main_O3_STANDALONE_WASM_noentry.jssize b/tests/other/metadce/mem_no_main_O3_STANDALONE_WASM_noentry.jssize
index a4e085a4e706e..9a14e64250b07 100644
--- a/tests/other/metadce/mem_no_main_O3_STANDALONE_WASM_noentry.jssize
+++ b/tests/other/metadce/mem_no_main_O3_STANDALONE_WASM_noentry.jssize
@@ -1 +1 @@
-13262
+13249
diff --git a/tests/other/metadce/minimal.jssize b/tests/other/metadce/minimal.jssize
index a602d938a1311..355d7ca62a70b 100644
--- a/tests/other/metadce/minimal.jssize
+++ b/tests/other/metadce/minimal.jssize
@@ -1 +1 @@
-123082
+122853
diff --git a/tests/other/metadce/minimal_O1.jssize b/tests/other/metadce/minimal_O1.jssize
index 4916406d2d8b4..28e265eb365c9 100644
--- a/tests/other/metadce/minimal_O1.jssize
+++ b/tests/other/metadce/minimal_O1.jssize
@@ -1 +1 @@
-56313
+56297
diff --git a/tests/other/metadce/minimal_O2.jssize b/tests/other/metadce/minimal_O2.jssize
index 0cb9ec48bcfe8..e1e1c53a59771 100644
--- a/tests/other/metadce/minimal_O2.jssize
+++ b/tests/other/metadce/minimal_O2.jssize
@@ -1 +1 @@
-20025
+20009
diff --git a/tests/other/metadce/minimal_O3.jssize b/tests/other/metadce/minimal_O3.jssize
index 0fc505c5b8e0a..957dc8e5dc5e0 100644
--- a/tests/other/metadce/minimal_O3.jssize
+++ b/tests/other/metadce/minimal_O3.jssize
@@ -1 +1 @@
-12293
+12280
diff --git a/tests/other/metadce/minimal_Os.jssize b/tests/other/metadce/minimal_Os.jssize
index c674acc20eee8..4f1aa91e9731e 100644
--- a/tests/other/metadce/minimal_Os.jssize
+++ b/tests/other/metadce/minimal_Os.jssize
@@ -1 +1 @@
-12090
+12077
diff --git a/tests/other/metadce/minimal_Os_MINIMAL_RUNTIME.jssize b/tests/other/metadce/minimal_Os_MINIMAL_RUNTIME.jssize
index 408adce179f47..34d9aaeb09340 100644
--- a/tests/other/metadce/minimal_Os_MINIMAL_RUNTIME.jssize
+++ b/tests/other/metadce/minimal_Os_MINIMAL_RUNTIME.jssize
@@ -1 +1 @@
-1044
+1043
diff --git a/tests/other/metadce/minimal_Oz.jssize b/tests/other/metadce/minimal_Oz.jssize
index c674acc20eee8..4f1aa91e9731e 100644
--- a/tests/other/metadce/minimal_Oz.jssize
+++ b/tests/other/metadce/minimal_Oz.jssize
@@ -1 +1 @@
-12090
+12077
diff --git a/tests/other/metadce/minimal_Oz_EVAL_CTORS.jssize b/tests/other/metadce/minimal_Oz_EVAL_CTORS.jssize
index e754e30889707..351720e2b31a9 100644
--- a/tests/other/metadce/minimal_Oz_EVAL_CTORS.jssize
+++ b/tests/other/metadce/minimal_Oz_EVAL_CTORS.jssize
@@ -1 +1 @@
-11826
+11813
diff --git a/tests/other/metadce/minimal_main_Oz_USE_PTHREADS_PROXY_TO_PTHREAD.jssize b/tests/other/metadce/minimal_main_Oz_USE_PTHREADS_PROXY_TO_PTHREAD.jssize
index c615de98f3e48..fc4fbafc27817 100644
--- a/tests/other/metadce/minimal_main_Oz_USE_PTHREADS_PROXY_TO_PTHREAD.jssize
+++ b/tests/other/metadce/minimal_main_Oz_USE_PTHREADS_PROXY_TO_PTHREAD.jssize
@@ -1 +1 @@
-47524
+47501
diff --git a/tests/test_other.py b/tests/test_other.py
index d8fc6c8c0c871..57e4f3c73b51e 100644
--- a/tests/test_other.py
+++ b/tests/test_other.py
@@ -9620,7 +9620,7 @@ def test(args):
     # Changing this option to [] should decrease code size.
     self.assertLess(changed, normal)
     # Check an absolute code size as well, with some slack.
-    self.assertLess(abs(changed - 5150), 150)
+    self.assertLess(abs(changed - 4994), 150)
 
   def test_llvm_includes(self):
     create_file('atomics.c', '#include <stdatomic.h>')
diff --git a/tools/experimental/reproduceriter.py b/tools/experimental/reproduceriter.py
index 9f36f23f85f07..cf9b4b30b7bb9 100644
--- a/tools/experimental/reproduceriter.py
+++ b/tools/experimental/reproduceriter.py
@@ -42,7 +42,7 @@
    example, if your application is a game that starts receiving
    events when in fullscreen, add something like
 
-    if (typeof Recorder != 'undefined') Recorder.start();
+    if (typeof Recorder !== 'undefined') Recorder.start();
 
    in the button that launches fullscreen. start() will start
    either recording when in record mode, or replaying when