chore: upgrade TypeScript to 5.9.3 and enable .ts imports

- Upgrade TypeScript from 5.0.4 to 5.9.3
- Update eslint, prettier, and related dev dependencies
- Enable `module: nodenext` and `rewriteRelativeImportExtensions` in tsconfigs
- Rewrite all relative imports from .js to .ts extensions
- Add `type` keyword to type-only imports across source files
- Remove TypeScript parameter properties from constructors
  (DevServer, PluginSyntaxError, WebSocketsManager)
- Fix internal-ip CJS interop for nodenext module resolution
- Add @ts-ignore for deprecated puppeteer accessibility API

Zero runtime behavior change — output remains CJS.

Assisted-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bennypowers

package-lock.json

@@ -57,26 +57,26 @@
     "@types/fs-extra": "^11.0.4",
     "@types/mocha": "^10.0.1",
     "@types/node": "*",
-    "@typescript-eslint/eslint-plugin": "^5.3.0",
-    "@typescript-eslint/parser": "^5.59.1",
+    "@typescript-eslint/eslint-plugin": "^8.48.0",
+    "@typescript-eslint/parser": "^8.48.0",
     "alex": "^11.0.0",
     "chai": "^4.3.4",
     "concurrently": "^8.0.1",
     "deepmerge": "^4.2.2",
     "dev-to-git": "^1.4.1",
-    "eslint": "^8.1.0",
-    "eslint-config-prettier": "^8.3.0",
+    "eslint": "^8.57.1",
+    "eslint-config-prettier": "^9.1.0",
     "hanbi": "^1.0.1",
     "husky": "^9.1.7",
     "lint-staged": "^15.2.11",
     "mocha": "^10.8.2",
     "nanocolors": "^0.2.1",
-    "prettier": "^2.4.1",
+    "prettier": "^3.7.1",
     "prettier-plugin-package": "^1.3.0",
     "rimraf": "^4.4.1",
     "rollup": "^4.4.0",
     "ts-node": "^10.4.0",
-    "typescript": "~5.0.4",
+    "typescript": "^5.9.3",
     "wireit": "^0.14.2"
   },
   "eslintConfig": {

package.json

@@ -1,4 +1,4 @@
-import { ParseStackTraceOptions, parseStackTrace } from './parseStackTrace.js';
+import { ParseStackTraceOptions, parseStackTrace } from './parseStackTrace.ts';
 
 const KEY_WTR_TYPE = '__WTR_TYPE__';
 const KEY_CONSTRUCTOR_NAME = '__WTR_CONSTRUCTOR_NAME__';

packages/browser-logs/src/deserialize.ts

@@ -1,8 +1,8 @@
-export { deserialize } from './deserialize.js';
-export { browserScript } from './browserScript.js';
+export { deserialize } from './deserialize.ts';
+export { browserScript } from './browserScript.ts';
 export {
   MapBrowserUrl,
   parseStackTrace,
   StackLocation,
   MapStackLocation,
-} from './parseStackTrace.js';
+} from './parseStackTrace.ts';

packages/browser-logs/src/index.ts

@@ -3,7 +3,6 @@
 {
   "extends": "../../tsconfig.node-base.json",
   "compilerOptions": {
-    "module": "commonjs",
     "outDir": "./dist",
     "rootDir": "./src",
     "composite": true,

packages/browser-logs/tsconfig.json

@@ -3,7 +3,6 @@
 {
   "extends": "../../tsconfig.node-base.json",
   "compilerOptions": {
-    "module": "commonjs",
     "outDir": "./dist",
     "rootDir": "./src",
     "composite": true,

packages/config-loader/tsconfig.json

@@ -11,7 +11,7 @@
  * subject to an additional IP rights grant found at
  * http://polymer.github.io/PATENTS.txt
  */
-export * from './modification.js';
-export * from './predicates.js';
-export * from './util.js';
-export * from './walking.js';
+export * from './modification.ts';
+export * from './predicates.ts';
+export * from './util.ts';
+export * from './walking.ts';

packages/dev-server-core/src/dom5/index.ts

@@ -12,8 +12,8 @@
  * http://polymer.github.io/PATENTS.txt
  */
 
-import { isElement, Predicate, predicates as p } from './predicates.js';
-import { defaultChildNodes, GetChildNodes } from './util.js';
+import { isElement, Predicate, predicates as p } from './predicates.ts';
+import { defaultChildNodes, GetChildNodes } from './util.ts';
 
 /**
  * Applies `mapfn` to `node` and the tree below `node`, yielding a flattened

packages/dev-server-core/src/dom5/iteration.ts

@@ -13,8 +13,8 @@
  */
 import cloneObject from 'clone';
 
-import { isDocumentFragment, predicates as p } from './predicates.js';
-import { queryAll } from './walking.js';
+import { isDocumentFragment, predicates as p } from './predicates.ts';
+import { queryAll } from './walking.ts';
 
 function newTextNode(value: string): any {
   return {

packages/dev-server-core/src/dom5/modification.ts

@@ -13,7 +13,7 @@
  * http://polymer.github.io/PATENTS.txt
  */
 
-import { getAttribute, getAttributeIndex, getTextContent } from './util.js';
+import { getAttribute, getAttributeIndex, getTextContent } from './util.ts';
 
 /**
  * Match the text inside an element, textnode, or comment