feat(release): ship esbuild bundle in npm package (#19171)

Co-authored-by: Yuna Seol <yunaseol@gmail.com>

scripts/prepare-npm-release.js

@@ -0,0 +1,67 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+
+const rootDir = process.cwd();
+
+function readJson(filePath) {
+  return JSON.parse(fs.readFileSync(path.resolve(rootDir, filePath), 'utf-8'));
+}
+
+function writeJson(filePath, data) {
+  fs.writeFileSync(
+    path.resolve(rootDir, filePath),
+    JSON.stringify(data, null, 2),
+  );
+}
+
+// Copy bundle directory into packages/cli
+const sourceBundleDir = path.resolve(rootDir, 'bundle');
+const destBundleDir = path.resolve(rootDir, 'packages/cli/bundle');
+
+if (fs.existsSync(sourceBundleDir)) {
+  fs.rmSync(destBundleDir, { recursive: true, force: true });
+  fs.cpSync(sourceBundleDir, destBundleDir, { recursive: true });
+  console.log('Copied bundle/ directory to packages/cli/');
+} else {
+  console.error(
+    'Error: bundle/ directory not found at project root. Please run `npm run bundle` first.',
+  );
+  process.exit(1);
+}
+
+// Inherit optionalDependencies from root package.json, excluding dev-only packages.
+const rootPkg = readJson('package.json');
+const optionalDependencies = { ...(rootPkg.optionalDependencies || {}) };
+delete optionalDependencies['gemini-cli-devtools'];
+
+// Update @google/gemini-cli package.json for bundled npm release
+const cliPkgPath = 'packages/cli/package.json';
+const cliPkg = readJson(cliPkgPath);
+
+cliPkg.files = ['bundle/'];
+cliPkg.bin = {
+  gemini: 'bundle/gemini.js',
+};
+
+delete cliPkg.dependencies;
+delete cliPkg.devDependencies;
+delete cliPkg.scripts;
+delete cliPkg.main;
+delete cliPkg.config;
+
+cliPkg.optionalDependencies = optionalDependencies;
+
+writeJson(cliPkgPath, cliPkg);
+
+console.log('Updated packages/cli/package.json for bundled npm release.');
+console.log(
+  'optionalDependencies:',
+  JSON.stringify(optionalDependencies, null, 2),
+);
+console.log('Successfully prepared packages for npm release.');