Migrate from CommonJS -> ESM

Author: bcherny

.gitignore

@@ -11,6 +11,6 @@ npm-debug.log
 node_modules
 *.js
 *.map
-dist/
-dist_tests/
+dist-cjs/
+dist-esm/
 yarn-error.log

.npmignore

@@ -7,7 +7,7 @@ node_modules
 *.map
 example
 test
-dist/test
+dist-esm/test
 circle.yml
 ARCHITECTURE.md
 CONTRIBUTING.md

.vscode/launch.json

@@ -5,7 +5,7 @@
         "type": "node",
         "request": "launch",
         "name": "Launch Program",
-        "program": "${workspaceRoot}/node_modules/.bin/ava ./dist/test/test.js",
+        "program": "${workspaceRoot}/node_modules/.bin/ava ./dist-esm/test/test.js",
         "cwd": "${workspaceRoot}"
     },
     {

package-lock.json

@@ -2,19 +2,24 @@
   "name": "json-schema-to-typescript",
   "version": "14.0.5",
   "description": "compile json schema to typescript typings",
-  "main": "dist/src/index.js",
+  "main": "dist-cjs/src/index.js",
+  "exports": {
+    "require": "./dist-cjs/src/index.js",
+    "import": "./dist-esm/src/index.js"
+  },
   "bin": {
-    "json2ts": "dist/src/cli.js"
+    "json2ts": "dist-esm/src/cli.js"
   },
-  "typings": "dist/src/index.d.ts",
+  "type": "module",
+  "typings": "dist-esm/src/index.d.ts",
   "engines": {
     "node": ">=16.0.0"
   },
   "scripts": {
     "build": "npm run lint && npm run clean && npm run build:browser && npm run build:server",
-    "build:browser": "browserify src/index.ts -s jstt -p tsify > dist/bundle.js",
-    "build:server": "tsc -d",
-    "clean": "shx rm -rf dist && mkdir dist",
+    "build:browser": "browserify src/index.ts -s jstt -p tsify > dist-esm/bundle.js",
+    "build:server": "tsc -p ./tsconfig.cjs.json -d && tsc -p ./tsconfig.esm.json -d",
+    "clean": "shx rm -rf dist-cjs && shx rm -rf dist-esm",
     "format": "prettier \"{src,test}/*.ts\" --write",
     "format-check": "prettier \"{src,test}/*.ts\" --check",
     "lint": "eslint src/*.ts test/*.ts",
@@ -23,7 +28,7 @@
     "stresstest": "seq 1 10 | xargs -I{} npm test",
     "prepublishOnly": "npm test",
     "pre-test": "npm run clean && npm run format-check && npm run build:server",
-    "watch": "tsc -w",
+    "watch": "tsc -p ./tsconfig.esm.json -w",
     "watch:test": "ava -w"
   },
   "repository": {
@@ -50,15 +55,14 @@
   "dependencies": {
     "@apidevtools/json-schema-ref-parser": "^11.5.5",
     "@types/json-schema": "^7.0.15",
-    "@types/lodash": "^4.17.0",
+    "@types/lodash-es": "^4.17.12",
     "cli-color": "^2.0.4",
     "glob": "^10.3.12",
     "is-glob": "^4.0.3",
     "js-yaml": "^4.1.0",
-    "lodash": "^4.17.21",
+    "lodash-es": "^4.17.21",
     "minimist": "^1.2.8",
     "mkdirp": "^3.0.1",
-    "mz": "^2.7.0",
     "node-fetch": "^3.3.2",
     "prettier": "^3.2.5"
   },
@@ -87,7 +91,7 @@
   },
   "ava": {
     "files": [
-      "./dist/test/test.js"
+      "./dist-esm/test/test.js"
     ],
     "snapshotDir": "./test/__snapshots__"
   },

package.json

@@ -1,13 +1,13 @@
 #!/usr/bin/env node
 
 import minimist from 'minimist'
-import {readFile, writeFile, existsSync, lstatSync, readdirSync} from 'mz/fs'
+import {existsSync, readdirSync, readFileSync, lstatSync, writeFileSync} from 'fs'
 import * as mkdirp from 'mkdirp'
 import {glob} from 'glob'
 import isGlob from 'is-glob'
 import {join, resolve, dirname} from 'path'
-import {compile, DEFAULT_OPTIONS, Options} from './index'
-import {pathTransform, error, parseFileAsJSONSchema, justName} from './utils'
+import {compile, DEFAULT_OPTIONS, Options} from './index.js'
+import {pathTransform, error, parseFileAsJSONSchema, justName} from './utils.js'
 
 main(
   minimist(process.argv.slice(2), {
@@ -114,14 +114,14 @@ async function processDir(argIn: string, argOut: string | undefined, argv: Parti
   )
 }
 
-async function outputResult(result: string, outputPath: string | undefined): Promise<void> {
+function outputResult(result: string, outputPath: string | undefined): void {
   if (!outputPath) {
     process.stdout.write(result)
   } else {
     if (!isDir(dirname(outputPath))) {
       mkdirp.sync(dirname(outputPath))
     }
-    return await writeFile(outputPath, result)
+    return writeFileSync(outputPath, result)
   }
 }
 
@@ -150,18 +150,18 @@ async function readInput(argIn?: string): Promise<{filename: string | null; cont
   }
   return {
     filename: argIn,
-    contents: await readFile(resolve(process.cwd(), argIn), 'utf-8'),
+    contents: readFileSync(resolve(process.cwd(), argIn), 'utf-8'),
   }
 }
 
 async function readStream(stream: NodeJS.ReadStream): Promise<string> {
-  const chunks = []
+  const chunks: Uint8Array[] = []
   for await (const chunk of stream) chunks.push(chunk)
   return Buffer.concat(chunks).toString('utf8')
 }
 
 function printHelp() {
-  const pkg = require('../../package.json')
+  const pkg = JSON.parse(readFileSync('../../package.json', 'utf8'))
 
   process.stdout.write(
     `

src/cli.ts

@@ -1,5 +1,5 @@
 import {format as prettify} from 'prettier'
-import {Options} from './'
+import {Options} from './index.js'
 
 export async function format(code: string, options: Options): Promise<string> {
   if (!options.format) {

src/formatter.ts

@@ -1,5 +1,5 @@
-import {memoize, omit} from 'lodash'
-import {DEFAULT_OPTIONS, Options} from './index'
+import {memoize, omit} from 'lodash-es'
+import {DEFAULT_OPTIONS, Options} from './index.js'
 import {
   AST,
   ASTWithStandaloneName,
@@ -13,8 +13,8 @@ import {
   TNamedInterface,
   TUnion,
   T_UNKNOWN,
-} from './types/AST'
-import {log, toSafeString} from './utils'
+} from './types/AST.js'
+import {log, toSafeString} from './utils.js'
 
 export function generate(ast: AST, options = DEFAULT_OPTIONS): string {
   return (

src/generator.ts

@@ -1,23 +1,23 @@
 import {readFileSync} from 'fs'
 import {JSONSchema4} from 'json-schema'
 import {ParserOptions as $RefOptions} from '@apidevtools/json-schema-ref-parser'
-import {cloneDeep, endsWith, merge} from 'lodash'
+import {cloneDeep, endsWith, merge} from 'lodash-es'
 import {dirname} from 'path'
 import {Options as PrettierOptions} from 'prettier'
-import {format} from './formatter'
-import {generate} from './generator'
-import {normalize} from './normalizer'
-import {optimize} from './optimizer'
-import {parse} from './parser'
-import {dereference} from './resolver'
-import {error, stripExtension, Try, log, parseFileAsJSONSchema} from './utils'
-import {validate} from './validator'
+import {format} from './formatter.js'
+import {generate} from './generator.js'
+import {normalize} from './normalizer.js'
+import {optimize} from './optimizer.js'
+import {parse} from './parser.js'
+import {dereference} from './resolver.js'
+import {error, stripExtension, Try, log, parseFileAsJSONSchema} from './utils.js'
+import {validate} from './validator.js'
 import {isDeepStrictEqual} from 'util'
-import {link} from './linker'
-import {validateOptions} from './optionValidator'
-import {JSONSchema as LinkedJSONSchema} from './types/JSONSchema'
+import {link} from './linker.js'
+import {validateOptions} from './optionValidator.js'
+import {JSONSchema as LinkedJSONSchema} from './types/JSONSchema.js'
 
-export {EnumJSONSchema, JSONSchema, NamedEnumJSONSchema, CustomTypeJSONSchema} from './types/JSONSchema'
+export {EnumJSONSchema, JSONSchema, NamedEnumJSONSchema, CustomTypeJSONSchema} from './types/JSONSchema.js'
 
 export interface Options {
   /**

src/index.ts

@@ -1,5 +1,5 @@
-import {JSONSchema, Parent, LinkedJSONSchema} from './types/JSONSchema'
-import {isPlainObject} from 'lodash'
+import {JSONSchema, Parent, LinkedJSONSchema} from './types/JSONSchema.js'
+import {isPlainObject} from 'lodash-es'
 import {JSONSchema4Type} from 'json-schema'
 
 /**