Merge pull request #34344 from overleaf/copilot/convert-fetch-utils-to-es-modules

Convert @overleaf/fetch-utils to TypeScript ESM with Vitest, enable noImplicitAny, fix downstream regressions, and align buildscript generation

GitOrigin-RevId: e060152f056cbae31da0650fb22471525835bd5e

libraries/fetch-utils/package.json

@@ -2,13 +2,19 @@
   "name": "@overleaf/fetch-utils",
   "version": "0.1.0",
   "description": "utilities for node-fetch",
-  "main": "index.js",
+  "main": "index.ts",
+  "exports": {
+    "import": "./index.ts",
+    "require": "./index.ts",
+    "default": "./index.ts"
+  },
+  "type": "module",
   "scripts": {
     "test": "yarn run lint && yarn run types:check && yarn run test:unit",
     "lint": "eslint --cache --cache-location ../../.cache/eslint/ --ext .cjs,.js,.jsx,.mjs,.ts --max-warnings 0 .",
     "lint:fix": "eslint --cache --cache-location ../../.cache/eslint/ --fix --ext .cjs,.js,.jsx,.mjs,.ts .",
     "test:ci": "yarn run test:unit",
-    "test:unit": "mocha --exit test/**/*.{js,cjs}",
+    "test:unit": "vitest --config vitest.config.ts",
     "types:check": "tsc --noEmit"
   },
   "author": "Overleaf (https://www.overleaf.com)",
@@ -18,11 +24,9 @@
     "chai": "^4.3.6",
     "chai-as-promised": "^7.1.1",
     "express": "4.22.1",
-    "mocha": "^11.1.0",
-    "mocha-junit-reporter": "^2.2.1",
-    "mocha-multi-reporters": "^1.5.1",
     "selfsigned": "^5.5.0",
-    "typescript": "^5.0.4"
+    "typescript": "^5.0.4",
+    "vitest": "4.1.5"
   },
   "dependencies": {
     "@overleaf/o-error": "workspace:*",