diff --git a/.gitignore b/.gitignore
index bb63c80db..d79d329bd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -285,4 +285,5 @@ inputfiles/browser.webidl.json
 !.vscode/launch.template.json
 yarn.lock
 TypeScript
-deploy/generated
\ No newline at end of file
+deploy/generated
+.early.coverage
\ No newline at end of file
diff --git a/deploy/createTypesPackages.js b/deploy/createTypesPackages.js
index a1677f0fc..15b53fb98 100644
--- a/deploy/createTypesPackages.js
+++ b/deploy/createTypesPackages.js
@@ -196,7 +196,7 @@ async function updatePackageJSON(pkg, packagePath) {
 /**
  * Copies the README and adds some rudimentary templating to the file.
  * @param {Package} pkg
- * @param {import("./template/package.json")} pkgJSON
+ * @param {typeof import("./template/package.json")} pkgJSON
  * @param {URL} writePath
  */
 function copyREADME(pkg, pkgJSON, writePath) {
diff --git a/inputfiles/mdn b/inputfiles/mdn
index 07cc896ae..1c0e6f38b 160000
--- a/inputfiles/mdn
+++ b/inputfiles/mdn
@@ -1 +1 @@
-Subproject commit 07cc896aee614b6af47546d95ac82c7e8471b448
+Subproject commit 1c0e6f38bf619c66a8d972b1891533b0e5423fbe
diff --git a/package-lock.json b/package-lock.json
index 6d52ec82c..98b81833a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,14 +10,15 @@
       "license": "Apache-2.0",
       "devDependencies": {
         "@eslint/js": "^9",
-        "@mdn/browser-compat-data": "^7.0.0",
+        "@mdn/browser-compat-data": "^6.1.0",
         "@octokit/rest": "^22.0.0",
         "@types/node": "^24.3.0",
         "@types/prettier": "^3.0.0",
         "@types/webidl2": "^24.4.3",
         "@typescript-eslint/eslint-plugin": "^8",
         "@typescript-eslint/parser": "^8",
-        "@webref/css": "^6.23.7",
+        "@typescript/native-preview": "^7.0.0-dev.20250804.1",
+        "@webref/css": "^6.23.6",
         "@webref/elements": "^2.5.0",
         "@webref/events": "^1.18.6",
         "@webref/idl": "^3.66.2",
@@ -396,9 +397,9 @@
       }
     },
     "node_modules/@mdn/browser-compat-data": {
-      "version": "7.1.0",
-      "resolved": "https://registry.npmjs.org/@mdn/browser-compat-data/-/browser-compat-data-7.1.0.tgz",
-      "integrity": "sha512-xEgsAGfEDa95aXtafVFQZ+KlP+MaUWwwN2thfOUfoMwM9m9P8DFmcMuJg6h2QwTg/Qpy31GjPIGbBfEilxqjOQ==",
+      "version": "6.1.5",
+      "resolved": "https://registry.npmjs.org/@mdn/browser-compat-data/-/browser-compat-data-6.1.5.tgz",
+      "integrity": "sha512-PzdZZzRhcXvKB0begee28n5lvwAcinGKYuLZOVxHAZm+n7y01ddEGfdS1ZXRuVcV+ndG6mSEAE8vgudom5UjYg==",
       "dev": true,
       "license": "CC0-1.0"
     },
@@ -1037,6 +1038,147 @@
         "url": "https://opencollective.com/eslint"
       }
     },
+    "node_modules/@typescript/native-preview": {
+      "version": "7.0.0-dev.20250828.1",
+      "resolved": "https://registry.npmjs.org/@typescript/native-preview/-/native-preview-7.0.0-dev.20250828.1.tgz",
+      "integrity": "sha512-HYW4UP/js2+f/odQz3iBbOk2TymLQGT0QmzWGZz7b9e2ilFfEVI8uyltRBVsovNyEXg+m0AfQaMHgK5epmuZKg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsgo": "bin/tsgo.js"
+      },
+      "engines": {
+        "node": ">=20.6.0"
+      },
+      "optionalDependencies": {
+        "@typescript/native-preview-darwin-arm64": "7.0.0-dev.20250828.1",
+        "@typescript/native-preview-darwin-x64": "7.0.0-dev.20250828.1",
+        "@typescript/native-preview-linux-arm": "7.0.0-dev.20250828.1",
+        "@typescript/native-preview-linux-arm64": "7.0.0-dev.20250828.1",
+        "@typescript/native-preview-linux-x64": "7.0.0-dev.20250828.1",
+        "@typescript/native-preview-win32-arm64": "7.0.0-dev.20250828.1",
+        "@typescript/native-preview-win32-x64": "7.0.0-dev.20250828.1"
+      }
+    },
+    "node_modules/@typescript/native-preview-darwin-arm64": {
+      "version": "7.0.0-dev.20250828.1",
+      "resolved": "https://registry.npmjs.org/@typescript/native-preview-darwin-arm64/-/native-preview-darwin-arm64-7.0.0-dev.20250828.1.tgz",
+      "integrity": "sha512-x88cosm1BxQXsogHdyI51KIBvAdEPh96Jthb9Su6A+5WxNob8pgbItA7dgSLWf68Fm0M7Dm3HkR0EvOGvnJq0Q==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=20.6.0"
+      }
+    },
+    "node_modules/@typescript/native-preview-darwin-x64": {
+      "version": "7.0.0-dev.20250828.1",
+      "resolved": "https://registry.npmjs.org/@typescript/native-preview-darwin-x64/-/native-preview-darwin-x64-7.0.0-dev.20250828.1.tgz",
+      "integrity": "sha512-tSoC7PLmuI4B4rFrRCawjRdyr/bPALnZGLETg5K9O2k3v2czTxhvKRIC11yE6k01XwTqXBGsZi90uCVaGrd05w==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=20.6.0"
+      }
+    },
+    "node_modules/@typescript/native-preview-linux-arm": {
+      "version": "7.0.0-dev.20250828.1",
+      "resolved": "https://registry.npmjs.org/@typescript/native-preview-linux-arm/-/native-preview-linux-arm-7.0.0-dev.20250828.1.tgz",
+      "integrity": "sha512-cpbY3M7XkGgTOWBd7ZJ/9tObtNoBSjabxFSoc6Oq3GkBh/GbnolGRiFYLkqbsNrWoy6NaxGQUf6+Qb+OJvFGlQ==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=20.6.0"
+      }
+    },
+    "node_modules/@typescript/native-preview-linux-arm64": {
+      "version": "7.0.0-dev.20250828.1",
+      "resolved": "https://registry.npmjs.org/@typescript/native-preview-linux-arm64/-/native-preview-linux-arm64-7.0.0-dev.20250828.1.tgz",
+      "integrity": "sha512-kqRNa8CYytWBSGpxXV7Bc3/W5z+aW4tU1VNtu5RG7O7KRhopo//qrVIHWKfSoKDIBoEr4//luHCkZ229sc1O8A==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=20.6.0"
+      }
+    },
+    "node_modules/@typescript/native-preview-linux-x64": {
+      "version": "7.0.0-dev.20250828.1",
+      "resolved": "https://registry.npmjs.org/@typescript/native-preview-linux-x64/-/native-preview-linux-x64-7.0.0-dev.20250828.1.tgz",
+      "integrity": "sha512-I8szvraJaKfkH7aMp842++3QBkEW0RTknGmG+xfIO9YQW0VcPRHKWwU/yWBvYVSTboRVJWfWs3NbGeQK0TvebQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=20.6.0"
+      }
+    },
+    "node_modules/@typescript/native-preview-win32-arm64": {
+      "version": "7.0.0-dev.20250828.1",
+      "resolved": "https://registry.npmjs.org/@typescript/native-preview-win32-arm64/-/native-preview-win32-arm64-7.0.0-dev.20250828.1.tgz",
+      "integrity": "sha512-pV8Y7t7STG+H2N1FoIU8TwJ0tz8zwEIBBEtP1MvY4GwqTPYgEqhm+Wb0wBP+7aXYF1hKeOmdXcIlZncBtEVomg==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=20.6.0"
+      }
+    },
+    "node_modules/@typescript/native-preview-win32-x64": {
+      "version": "7.0.0-dev.20250828.1",
+      "resolved": "https://registry.npmjs.org/@typescript/native-preview-win32-x64/-/native-preview-win32-x64-7.0.0-dev.20250828.1.tgz",
+      "integrity": "sha512-rbYPx5IWFbt9epRhHopCxaJz4zZA87PGm5KyUkxkTj3ABgKgo0Em7CovKgroUqXSeXwvDt/8f3Yr43j8heUhwQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=20.6.0"
+      }
+    },
     "node_modules/@webref/css": {
       "version": "6.23.7",
       "resolved": "https://registry.npmjs.org/@webref/css/-/css-6.23.7.tgz",
diff --git a/package.json b/package.json
index f51aab7bd..972a964be 100644
--- a/package.json
+++ b/package.json
@@ -12,15 +12,15 @@
     "worklet"
   ],
   "scripts": {
-    "build": "tsc && node ./lib/build.js",
+    "build": "tsgo && node ./lib/build.js",
     "baseline-accept": "cpx \"generated\\**\" baselines\\",
-    "lint": "eslint --max-warnings 0 src deploy/*.js && tsc -p deploy/jsconfig.json",
+    "lint": "eslint --max-warnings 0 src deploy/*.js && tsgo -p deploy/jsconfig.json",
     "lint-fix": "eslint --max-warnings 0 src deploy/*.js --fix",
     "test": "npm run build && npm run lint && node ./lib/test.js && node ./unittests/index.js",
-    "changelog": "tsc && node ./lib/changelog.js",
+    "changelog": "tsgo && node ./lib/changelog.js",
     "ts-changelog": "node ./deploy/versionChangelog.js",
     "migrate": "node ./deploy/migrate.js",
-    "version": "npm i && tsc && node ./lib/version.js",
+    "version": "npm i && tsgo && node ./lib/version.js",
     "generate": "npm run build && npm run baseline-accept"
   },
   "author": {
@@ -39,14 +39,15 @@
   "type": "module",
   "devDependencies": {
     "@eslint/js": "^9",
-    "@mdn/browser-compat-data": "^7.0.0",
+    "@mdn/browser-compat-data": "^6.1.0",
     "@octokit/rest": "^22.0.0",
     "@types/node": "^24.3.0",
     "@types/prettier": "^3.0.0",
     "@types/webidl2": "^24.4.3",
     "@typescript-eslint/eslint-plugin": "^8",
     "@typescript-eslint/parser": "^8",
-    "@webref/css": "^6.23.7",
+    "@typescript/native-preview": "^7.0.0-dev.20250804.1",
+    "@webref/css": "^6.23.6",
     "@webref/elements": "^2.5.0",
     "@webref/events": "^1.18.6",
     "@webref/idl": "^3.66.2",