diff --git a/.eslintignore b/.eslintignore
index e58be97cbaf5..2854c10c59f3 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -14,7 +14,6 @@ packages/docusaurus-*/lib/*
 packages/docusaurus-*/lib-next/
 packages/eslint-plugin/lib/
 packages/stylelint-copyright/lib/
-copyUntypedFiles.mjs
 
 packages/create-docusaurus/lib/*
 packages/create-docusaurus/templates/facebook
diff --git a/admin/scripts/copyUntypedFiles.mjs b/admin/scripts/copyUntypedFiles.mjs
new file mode 100644
index 000000000000..59178146452a
--- /dev/null
+++ b/admin/scripts/copyUntypedFiles.mjs
@@ -0,0 +1,36 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import fs from 'fs-extra';
+import path from 'path';
+import chokidar from 'chokidar';
+
+const srcDir = path.join(process.cwd(), 'src');
+const libDir = path.join(process.cwd(), 'lib');
+
+const ignoredPattern = /(?:__tests__|\.tsx?$)/;
+
+async function copy() {
+  await fs.copy(srcDir, libDir, {
+    filter(testedPath) {
+      return !ignoredPattern.test(testedPath);
+    },
+  });
+}
+
+if (process.argv.includes('--watch')) {
+  const watcher = chokidar.watch(srcDir, {
+    ignored: ignoredPattern,
+    ignoreInitial: true,
+    persistent: true,
+  });
+  ['add', 'change', 'unlink', 'addDir', 'unlinkDir'].forEach((event) =>
+    watcher.on(event, copy),
+  );
+} else {
+  await copy();
+}
diff --git a/packages/create-docusaurus/.npmignore b/packages/create-docusaurus/.npmignore
index 0bc0b32a6248..1f851e4a70c0 100644
--- a/packages/create-docusaurus/.npmignore
+++ b/packages/create-docusaurus/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 __tests__
 node_modules
diff --git a/packages/create-docusaurus/package.json b/packages/create-docusaurus/package.json
index 583b6f06617f..d7a60dba1c13 100755
--- a/packages/create-docusaurus/package.json
+++ b/packages/create-docusaurus/package.json
@@ -14,7 +14,7 @@
   "scripts": {
     "create-docusaurus": "create-docusaurus",
     "build": "tsc --build",
-    "watch": "tsc --watch"
+    "watch": "tsc --build --watch"
   },
   "bin": "bin/index.js",
   "publishConfig": {
diff --git a/packages/docusaurus-cssnano-preset/.npmignore b/packages/docusaurus-cssnano-preset/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-cssnano-preset/.npmignore
+++ b/packages/docusaurus-cssnano-preset/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-logger/.npmignore b/packages/docusaurus-logger/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-logger/.npmignore
+++ b/packages/docusaurus-logger/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-mdx-loader/.npmignore b/packages/docusaurus-mdx-loader/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-mdx-loader/.npmignore
+++ b/packages/docusaurus-mdx-loader/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-migrate/.npmignore b/packages/docusaurus-migrate/.npmignore
index b3d2bb61f7d9..e4132af42172 100644
--- a/packages/docusaurus-migrate/.npmignore
+++ b/packages/docusaurus-migrate/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-migrate/package.json b/packages/docusaurus-migrate/package.json
index ea7affc71cf1..9e980899705f 100644
--- a/packages/docusaurus-migrate/package.json
+++ b/packages/docusaurus-migrate/package.json
@@ -8,7 +8,7 @@
   },
   "scripts": {
     "build": "tsc --build",
-    "watch": "tsc --watch"
+    "watch": "tsc --build --watch"
   },
   "repository": {
     "type": "git",
diff --git a/packages/docusaurus-plugin-client-redirects/.npmignore b/packages/docusaurus-plugin-client-redirects/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-plugin-client-redirects/.npmignore
+++ b/packages/docusaurus-plugin-client-redirects/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-plugin-content-blog/.npmignore b/packages/docusaurus-plugin-content-blog/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-plugin-content-blog/.npmignore
+++ b/packages/docusaurus-plugin-content-blog/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-plugin-content-docs/.npmignore b/packages/docusaurus-plugin-content-docs/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-plugin-content-docs/.npmignore
+++ b/packages/docusaurus-plugin-content-docs/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-plugin-content-docs/package.json b/packages/docusaurus-plugin-content-docs/package.json
index c02fc60957b0..bf59cd020096 100644
--- a/packages/docusaurus-plugin-content-docs/package.json
+++ b/packages/docusaurus-plugin-content-docs/package.json
@@ -13,7 +13,7 @@
   "types": "src/plugin-content-docs.d.ts",
   "scripts": {
     "build": "tsc --build",
-    "watch": "tsc --watch"
+    "watch": "tsc --build --watch"
   },
   "publishConfig": {
     "access": "public"
diff --git a/packages/docusaurus-plugin-content-pages/.npmignore b/packages/docusaurus-plugin-content-pages/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-plugin-content-pages/.npmignore
+++ b/packages/docusaurus-plugin-content-pages/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-plugin-debug/.npmignore b/packages/docusaurus-plugin-debug/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-plugin-debug/.npmignore
+++ b/packages/docusaurus-plugin-debug/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-plugin-debug/copyUntypedFiles.mjs b/packages/docusaurus-plugin-debug/copyUntypedFiles.mjs
deleted file mode 100644
index 8b230152f1af..000000000000
--- a/packages/docusaurus-plugin-debug/copyUntypedFiles.mjs
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-import fs from 'fs-extra';
-import {fileURLToPath} from 'url';
-
-/**
- * Copy all untyped and static assets files to lib.
- */
-const srcDir = fileURLToPath(new URL('src', import.meta.url));
-const libDir = fileURLToPath(new URL('lib', import.meta.url));
-await fs.copy(srcDir, libDir, {
-  filter(filepath) {
-    return !/__tests__/.test(filepath) && !/\.tsx?$/.test(filepath);
-  },
-});
diff --git a/packages/docusaurus-plugin-debug/package.json b/packages/docusaurus-plugin-debug/package.json
index eb9ce3d41a4e..3c68544c139b 100644
--- a/packages/docusaurus-plugin-debug/package.json
+++ b/packages/docusaurus-plugin-debug/package.json
@@ -5,8 +5,10 @@
   "main": "lib/index.js",
   "types": "src/plugin-debug.d.ts",
   "scripts": {
-    "build": "tsc --build && node copyUntypedFiles.mjs && prettier --config ../../.prettierrc --write \"lib/theme/**/*.js\"",
-    "watch": "node copyUntypedFiles.mjs && tsc --watch"
+    "build": "tsc --build && node ../../admin/scripts/copyUntypedFiles.mjs && prettier --config ../../.prettierrc --write \"lib/theme/**/*.js\"",
+    "watch": "run-p -c copy:watch build:watch",
+    "build:watch": "tsc --build --watch",
+    "copy:watch": "node ../../admin/scripts/copyUntypedFiles.mjs --watch"
   },
   "publishConfig": {
     "access": "public"
diff --git a/packages/docusaurus-plugin-google-analytics/.npmignore b/packages/docusaurus-plugin-google-analytics/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-plugin-google-analytics/.npmignore
+++ b/packages/docusaurus-plugin-google-analytics/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-plugin-google-analytics/package.json b/packages/docusaurus-plugin-google-analytics/package.json
index 99531da0ac1f..f62db432005c 100644
--- a/packages/docusaurus-plugin-google-analytics/package.json
+++ b/packages/docusaurus-plugin-google-analytics/package.json
@@ -9,7 +9,7 @@
   },
   "scripts": {
     "build": "tsc --build",
-    "watch": "tsc --watch"
+    "watch": "tsc --build --watch"
   },
   "repository": {
     "type": "git",
diff --git a/packages/docusaurus-plugin-google-gtag/.npmignore b/packages/docusaurus-plugin-google-gtag/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-plugin-google-gtag/.npmignore
+++ b/packages/docusaurus-plugin-google-gtag/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-plugin-google-gtag/package.json b/packages/docusaurus-plugin-google-gtag/package.json
index 169b2c962a7a..c353d7a1a28c 100644
--- a/packages/docusaurus-plugin-google-gtag/package.json
+++ b/packages/docusaurus-plugin-google-gtag/package.json
@@ -6,7 +6,7 @@
   "types": "lib/index.d.ts",
   "scripts": {
     "build": "tsc --build",
-    "watch": "tsc --watch"
+    "watch": "tsc --build --watch"
   },
   "publishConfig": {
     "access": "public"
diff --git a/packages/docusaurus-plugin-ideal-image/.npmignore b/packages/docusaurus-plugin-ideal-image/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-plugin-ideal-image/.npmignore
+++ b/packages/docusaurus-plugin-ideal-image/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-plugin-ideal-image/copyUntypedFiles.mjs b/packages/docusaurus-plugin-ideal-image/copyUntypedFiles.mjs
deleted file mode 100644
index 8b230152f1af..000000000000
--- a/packages/docusaurus-plugin-ideal-image/copyUntypedFiles.mjs
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-import fs from 'fs-extra';
-import {fileURLToPath} from 'url';
-
-/**
- * Copy all untyped and static assets files to lib.
- */
-const srcDir = fileURLToPath(new URL('src', import.meta.url));
-const libDir = fileURLToPath(new URL('lib', import.meta.url));
-await fs.copy(srcDir, libDir, {
-  filter(filepath) {
-    return !/__tests__/.test(filepath) && !/\.tsx?$/.test(filepath);
-  },
-});
diff --git a/packages/docusaurus-plugin-ideal-image/package.json b/packages/docusaurus-plugin-ideal-image/package.json
index 6449d75574fe..4feb2ff1b92c 100644
--- a/packages/docusaurus-plugin-ideal-image/package.json
+++ b/packages/docusaurus-plugin-ideal-image/package.json
@@ -5,7 +5,10 @@
   "main": "lib/index.js",
   "types": "src/plugin-ideal-image.d.ts",
   "scripts": {
-    "build": "tsc --build && node copyUntypedFiles.mjs && prettier --config ../../.prettierrc --write \"lib/theme/**/*.js\""
+    "build": "tsc --build && node ../../admin/scripts/copyUntypedFiles.mjs && prettier --config ../../.prettierrc --write \"lib/theme/**/*.js\"",
+    "watch": "run-p -c copy:watch build:watch",
+    "build:watch": "tsc --build --watch",
+    "copy:watch": "node ../../admin/scripts/copyUntypedFiles.mjs --watch"
   },
   "publishConfig": {
     "access": "public"
diff --git a/packages/docusaurus-plugin-pwa/.npmignore b/packages/docusaurus-plugin-pwa/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-plugin-pwa/.npmignore
+++ b/packages/docusaurus-plugin-pwa/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-plugin-pwa/copyUntypedFiles.mjs b/packages/docusaurus-plugin-pwa/copyUntypedFiles.mjs
deleted file mode 100644
index 8b230152f1af..000000000000
--- a/packages/docusaurus-plugin-pwa/copyUntypedFiles.mjs
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-import fs from 'fs-extra';
-import {fileURLToPath} from 'url';
-
-/**
- * Copy all untyped and static assets files to lib.
- */
-const srcDir = fileURLToPath(new URL('src', import.meta.url));
-const libDir = fileURLToPath(new URL('lib', import.meta.url));
-await fs.copy(srcDir, libDir, {
-  filter(filepath) {
-    return !/__tests__/.test(filepath) && !/\.tsx?$/.test(filepath);
-  },
-});
diff --git a/packages/docusaurus-plugin-pwa/package.json b/packages/docusaurus-plugin-pwa/package.json
index 3bc6d0cd22ee..92465928d16c 100644
--- a/packages/docusaurus-plugin-pwa/package.json
+++ b/packages/docusaurus-plugin-pwa/package.json
@@ -5,7 +5,10 @@
   "main": "lib/index.js",
   "types": "src/plugin-pwa.d.ts",
   "scripts": {
-    "build": "tsc --build && node copyUntypedFiles.mjs && prettier --config ../../.prettierrc --write \"lib/theme/**/*.js\""
+    "build": "tsc --build && node ../../admin/scripts/copyUntypedFiles.mjs && prettier --config ../../.prettierrc --write \"lib/theme/**/*.js\"",
+    "watch": "run-p -c copy:watch build:watch",
+    "build:watch": "tsc --build --watch",
+    "copy:watch": "node ../../admin/scripts/copyUntypedFiles.mjs --watch"
   },
   "publishConfig": {
     "access": "public"
diff --git a/packages/docusaurus-plugin-sitemap/.npmignore b/packages/docusaurus-plugin-sitemap/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-plugin-sitemap/.npmignore
+++ b/packages/docusaurus-plugin-sitemap/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-preset-classic/.npmignore b/packages/docusaurus-preset-classic/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-preset-classic/.npmignore
+++ b/packages/docusaurus-preset-classic/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-remark-plugin-npm2yarn/.npmignore b/packages/docusaurus-remark-plugin-npm2yarn/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-remark-plugin-npm2yarn/.npmignore
+++ b/packages/docusaurus-remark-plugin-npm2yarn/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-theme-classic/.npmignore b/packages/docusaurus-theme-classic/.npmignore
index 3f56a7b661b6..955841b312a2 100644
--- a/packages/docusaurus-theme-classic/.npmignore
+++ b/packages/docusaurus-theme-classic/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-theme-common/.npmignore b/packages/docusaurus-theme-common/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-theme-common/.npmignore
+++ b/packages/docusaurus-theme-common/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-theme-common/copyUntypedFiles.mjs b/packages/docusaurus-theme-common/copyUntypedFiles.mjs
deleted file mode 100644
index 8b230152f1af..000000000000
--- a/packages/docusaurus-theme-common/copyUntypedFiles.mjs
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-import fs from 'fs-extra';
-import {fileURLToPath} from 'url';
-
-/**
- * Copy all untyped and static assets files to lib.
- */
-const srcDir = fileURLToPath(new URL('src', import.meta.url));
-const libDir = fileURLToPath(new URL('lib', import.meta.url));
-await fs.copy(srcDir, libDir, {
-  filter(filepath) {
-    return !/__tests__/.test(filepath) && !/\.tsx?$/.test(filepath);
-  },
-});
diff --git a/packages/docusaurus-theme-common/package.json b/packages/docusaurus-theme-common/package.json
index 4cd433a79e1b..59a1d91f87c2 100644
--- a/packages/docusaurus-theme-common/package.json
+++ b/packages/docusaurus-theme-common/package.json
@@ -13,8 +13,10 @@
     "./Details": "./lib/components/Details/index.js"
   },
   "scripts": {
-    "build": "node copyUntypedFiles.mjs && tsc",
-    "watch": "node copyUntypedFiles.mjs && tsc --watch"
+    "build": "tsc && node ../../admin/scripts/copyUntypedFiles.mjs",
+    "watch": "run-p -c copy:watch build:watch",
+    "build:watch": "tsc --watch",
+    "copy:watch": "node ../../admin/scripts/copyUntypedFiles.mjs --watch"
   },
   "publishConfig": {
     "access": "public"
diff --git a/packages/docusaurus-theme-live-codeblock/.npmignore b/packages/docusaurus-theme-live-codeblock/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-theme-live-codeblock/.npmignore
+++ b/packages/docusaurus-theme-live-codeblock/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-theme-live-codeblock/copyUntypedFiles.mjs b/packages/docusaurus-theme-live-codeblock/copyUntypedFiles.mjs
deleted file mode 100644
index 8b230152f1af..000000000000
--- a/packages/docusaurus-theme-live-codeblock/copyUntypedFiles.mjs
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-import fs from 'fs-extra';
-import {fileURLToPath} from 'url';
-
-/**
- * Copy all untyped and static assets files to lib.
- */
-const srcDir = fileURLToPath(new URL('src', import.meta.url));
-const libDir = fileURLToPath(new URL('lib', import.meta.url));
-await fs.copy(srcDir, libDir, {
-  filter(filepath) {
-    return !/__tests__/.test(filepath) && !/\.tsx?$/.test(filepath);
-  },
-});
diff --git a/packages/docusaurus-theme-live-codeblock/package.json b/packages/docusaurus-theme-live-codeblock/package.json
index 661b8b3cc45e..04d45ca3d01f 100644
--- a/packages/docusaurus-theme-live-codeblock/package.json
+++ b/packages/docusaurus-theme-live-codeblock/package.json
@@ -11,7 +11,10 @@
     "access": "public"
   },
   "scripts": {
-    "build": "tsc --build && node copyUntypedFiles.mjs && prettier --config ../../.prettierrc --write \"lib/theme/**/*.js\""
+    "build": "tsc --build && node ../../admin/scripts/copyUntypedFiles.mjs && prettier --config ../../.prettierrc --write \"lib/theme/**/*.js\"",
+    "watch": "run-p -c copy:watch build:watch",
+    "build:watch": "tsc --build --watch",
+    "copy:watch": "node ../../admin/scripts/copyUntypedFiles.mjs --watch"
   },
   "repository": {
     "type": "git",
diff --git a/packages/docusaurus-theme-search-algolia/.npmignore b/packages/docusaurus-theme-search-algolia/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-theme-search-algolia/.npmignore
+++ b/packages/docusaurus-theme-search-algolia/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-theme-search-algolia/copyUntypedFiles.mjs b/packages/docusaurus-theme-search-algolia/copyUntypedFiles.mjs
deleted file mode 100644
index 8b230152f1af..000000000000
--- a/packages/docusaurus-theme-search-algolia/copyUntypedFiles.mjs
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-import fs from 'fs-extra';
-import {fileURLToPath} from 'url';
-
-/**
- * Copy all untyped and static assets files to lib.
- */
-const srcDir = fileURLToPath(new URL('src', import.meta.url));
-const libDir = fileURLToPath(new URL('lib', import.meta.url));
-await fs.copy(srcDir, libDir, {
-  filter(filepath) {
-    return !/__tests__/.test(filepath) && !/\.tsx?$/.test(filepath);
-  },
-});
diff --git a/packages/docusaurus-theme-search-algolia/package.json b/packages/docusaurus-theme-search-algolia/package.json
index 2a809087b4cc..9c062e117952 100644
--- a/packages/docusaurus-theme-search-algolia/package.json
+++ b/packages/docusaurus-theme-search-algolia/package.json
@@ -21,7 +21,10 @@
   },
   "license": "MIT",
   "scripts": {
-    "build": "tsc --build && node copyUntypedFiles.mjs && prettier --config ../../.prettierrc --write \"lib/theme/**/*.js\""
+    "build": "tsc --build && node ../../admin/scripts/copyUntypedFiles.mjs && prettier --config ../../.prettierrc --write \"lib/theme/**/*.js\"",
+    "watch": "run-p -c copy:watch build:watch",
+    "build:watch": "tsc --build --watch",
+    "copy:watch": "node ../../admin/scripts/copyUntypedFiles.mjs --watch"
   },
   "dependencies": {
     "@docsearch/react": "^3.0.0",
diff --git a/packages/docusaurus-theme-translations/.npmignore b/packages/docusaurus-theme-translations/.npmignore
index acffb6122e75..7059569fc57d 100644
--- a/packages/docusaurus-theme-translations/.npmignore
+++ b/packages/docusaurus-theme-translations/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-theme-translations/package.json b/packages/docusaurus-theme-translations/package.json
index ea54a523851f..a296a446f3eb 100644
--- a/packages/docusaurus-theme-translations/package.json
+++ b/packages/docusaurus-theme-translations/package.json
@@ -15,7 +15,7 @@
   "license": "MIT",
   "scripts": {
     "build": "tsc --build",
-    "watch": "tsc --watch",
+    "watch": "tsc --build --watch",
     "update": "node ./update.mjs"
   },
   "dependencies": {
diff --git a/packages/docusaurus-utils-common/.npmignore b/packages/docusaurus-utils-common/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-utils-common/.npmignore
+++ b/packages/docusaurus-utils-common/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-utils-validation/.npmignore b/packages/docusaurus-utils-validation/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-utils-validation/.npmignore
+++ b/packages/docusaurus-utils-validation/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus-utils/.npmignore b/packages/docusaurus-utils/.npmignore
index 16beccca2e07..03c9ae1e1b54 100644
--- a/packages/docusaurus-utils/.npmignore
+++ b/packages/docusaurus-utils/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus/.npmignore b/packages/docusaurus/.npmignore
index b3d2bb61f7d9..e4132af42172 100644
--- a/packages/docusaurus/.npmignore
+++ b/packages/docusaurus/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/docusaurus/copyUntypedFiles.mjs b/packages/docusaurus/copyUntypedFiles.mjs
deleted file mode 100644
index 8b230152f1af..000000000000
--- a/packages/docusaurus/copyUntypedFiles.mjs
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-import fs from 'fs-extra';
-import {fileURLToPath} from 'url';
-
-/**
- * Copy all untyped and static assets files to lib.
- */
-const srcDir = fileURLToPath(new URL('src', import.meta.url));
-const libDir = fileURLToPath(new URL('lib', import.meta.url));
-await fs.copy(srcDir, libDir, {
-  filter(filepath) {
-    return !/__tests__/.test(filepath) && !/\.tsx?$/.test(filepath);
-  },
-});
diff --git a/packages/docusaurus/package.json b/packages/docusaurus/package.json
index 1fb6245f9fb1..ac1af6b0a864 100644
--- a/packages/docusaurus/package.json
+++ b/packages/docusaurus/package.json
@@ -24,8 +24,10 @@
     "docusaurus": "bin/docusaurus.mjs"
   },
   "scripts": {
-    "build": "tsc --build && node copyUntypedFiles.mjs",
-    "watch": "node copyUntypedFiles.mjs && tsc --watch"
+    "build": "tsc --build && node ../../admin/scripts/copyUntypedFiles.mjs",
+    "watch": "run-p -c copy:watch build:watch",
+    "build:watch": "tsc --build --watch",
+    "copy:watch": "node ../../admin/scripts/copyUntypedFiles.mjs --watch"
   },
   "bugs": {
     "url": "https://github.com/facebook/docusaurus/issues"
diff --git a/packages/eslint-plugin/.npmignore b/packages/eslint-plugin/.npmignore
index 3e3043484f2e..733c0b46e93a 100644
--- a/packages/eslint-plugin/.npmignore
+++ b/packages/eslint-plugin/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/packages/lqip-loader/.npmignore b/packages/lqip-loader/.npmignore
index b3d2bb61f7d9..e4132af42172 100644
--- a/packages/lqip-loader/.npmignore
+++ b/packages/lqip-loader/.npmignore
@@ -1,4 +1,3 @@
-copyUntypedFiles.mjs
 .tsbuildinfo*
 tsconfig*
 __tests__
diff --git a/website/package.json b/website/package.json
index 734cd2e4faf4..416bc81e47b1 100644
--- a/website/package.json
+++ b/website/package.json
@@ -30,8 +30,7 @@
     "netlify:crowdin:downloadTranslationsFailSafe": "yarn netlify:crowdin:wait && (yarn --cwd .. crowdin:download:website || echo 'Crowdin translation download failure (only internal PRs have access to the Crowdin env token)')",
     "netlify:crowdin:uploadSources": "yarn --cwd .. crowdin:upload:website",
     "netlify:test": "yarn netlify:build:deployPreview && npx --package netlify-cli netlify dev -- --debug",
-    "typecheck": "tsc",
-    "watch": "tsc --watch"
+    "typecheck": "tsc"
   },
   "dependencies": {
     "@crowdin/cli": "^3.7.8",