diff --git a/libraries/o-error/index.js b/libraries/o-error/index.cjs
similarity index 100%
rename from libraries/o-error/index.js
rename to libraries/o-error/index.cjs
diff --git a/libraries/o-error/package.json b/libraries/o-error/package.json
index 306ee07cda..a5283d4a82 100644
--- a/libraries/o-error/package.json
+++ b/libraries/o-error/package.json
@@ -12,9 +12,9 @@
     "cause",
     "verror"
   ],
-  "main": "index.js",
+  "main": "index.cjs",
   "files": [
-    "index.js",
+    "index.cjs",
     "index.d.ts"
   ],
   "scripts": {
@@ -26,7 +26,7 @@
     "prepublishOnly": "npm run --silent declaration:build && npm run --silent declaration:check",
     "test": "mocha",
     "test:coverage": "nyc --reporter=lcov --reporter=text-summary npm run test",
-    "typecheck": "tsc --allowJs --checkJs --noEmit --moduleResolution node --strict --target ES6 *.js test/**/*.js",
+    "typecheck": "tsc --allowJs --checkJs --noEmit --moduleResolution node --strict --target ES6 *.cjs test/**/*.js",
     "update-readme": "doc/update-readme.js",
     "format": "prettier --list-different $PWD/'**/*.js'",
     "format:fix": "prettier --write $PWD/'**/*.js'",
diff --git a/libraries/ranges-tracker/index.js b/libraries/ranges-tracker/index.cjs
similarity index 100%
rename from libraries/ranges-tracker/index.js
rename to libraries/ranges-tracker/index.cjs
diff --git a/libraries/ranges-tracker/package.json b/libraries/ranges-tracker/package.json
index 8c54e046eb..13a2428f85 100644
--- a/libraries/ranges-tracker/package.json
+++ b/libraries/ranges-tracker/package.json
@@ -1,9 +1,9 @@
 {
   "name": "@overleaf/ranges-tracker",
   "description": "Shared logic for syncing comments and tracked changes with operational transforms",
-  "main": "index.js",
+  "main": "index.cjs",
   "files": [
-    "index.js"
+    "index.cjs"
   ],
   "author": "Overleaf (https://www.overleaf.com)",
   "private": true,
diff --git a/services/web/webpack.config.js b/services/web/webpack.config.js
index 04b2532e85..726dccad6a 100644
--- a/services/web/webpack.config.js
+++ b/services/web/webpack.config.js
@@ -221,7 +221,7 @@ module.exports = {
         `frontend/js/vendor/libs/${PackageVersions.lib('fineuploader')}`
       ),
     },
-    symlinks: false,
+    // symlinks: false, // enable this while using `npm link`
     extensions: ['.js', '.jsx', '.ts', '.tsx', '.json'],
     fallback: {
       events: require.resolve('events'),