diff --git a/build/dev/sync-extensions.js b/build/dev/sync-extensions.js
new file mode 100644
index 0000000000000000000000000000000000000000..9a6265389274eb1b775ebe6ade7e3249b367e1b6
--- /dev/null
+++ b/build/dev/sync-extensions.js
@@ -0,0 +1,52 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+const fs = require('fs').promises;
+const path = require('path');
+const cp = require('child_process');
+const product = require('../../product.json');
+const root = path.resolve(path.join(__dirname, '..', '..', '..'));
+
+async function exists(path) {
+	try {
+		await fs.stat(path);
+		return true;
+	} catch {
+		return false;
+	}
+}
+
+async function exec(cmd, opts = {}) {
+	return new Promise((c, e) => {
+		const child = cp.spawn(cmd, { shell: true, stdio: 'inherit', ...opts });
+		child.on('close', code => code === 0 ? c() : e(`Returned ${code}`));
+	});
+}
+
+async function cloneOrPull(ext) {
+	const folderName = ext.repo.replace(/.*\//, '');
+	const folder = path.join(root, folderName);
+
+	if (!await exists(folder)) {
+		const url = `${ext.repo}.git`;
+		await exec(`git clone ${url}`, { cwd: root });
+	} else {
+		await exec(`git pull`, { cwd: folder });
+	}
+}
+
+async function main() {
+	for (const ext of product.builtInExtensions) {
+		console.log(`👉 ${ext.name}`);
+		await cloneOrPull(ext);
+	}
+}
+
+if (require.main === module) {
+	main().catch(err => {
+		console.error(err);
+		process.exit(1);
+	});
+}