fix(cli): preserve proxy-agent named exports in ESM bundle (google-gemini#27145)

Author: ashishch432

esbuild.config.js

@@ -102,6 +102,14 @@ const cliConfig = {
   plugins: createWasmPlugins(),
   alias: {
     'is-in-ci': path.resolve(__dirname, 'packages/cli/src/patches/is-in-ci.ts'),
+    'https-proxy-agent': path.resolve(
+      __dirname,
+      'packages/cli/src/patches/https-proxy-agent.ts',
+    ),
+    'http-proxy-agent': path.resolve(
+      __dirname,
+      'packages/cli/src/patches/http-proxy-agent.ts',
+    ),
     ...commonAliases,
   },
   metafile: true,

packages/cli/src/patches/http-proxy-agent.ts

@@ -0,0 +1,8 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+// eslint-disable-next-line import/no-relative-packages
+export { HttpProxyAgent } from '../../../../node_modules/http-proxy-agent/dist/index.js';

packages/cli/src/patches/https-proxy-agent.ts

@@ -0,0 +1,8 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+// eslint-disable-next-line import/no-relative-packages
+export { HttpsProxyAgent } from '../../../../node_modules/https-proxy-agent/dist/index.js';

scripts/tests/proxy-agent-bundle.test.ts

@@ -0,0 +1,80 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, expect, it, vi } from 'vitest';
+vi.unmock('fs');
+vi.unmock('node:fs');
+import * as esbuild from 'esbuild';
+import path from 'node:path';
+import { mkdtempSync, writeFileSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { fileURLToPath, pathToFileURL } from 'node:url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const projectRoot = path.resolve(__dirname, '../../');
+
+describe('proxy-agent bundle shape', () => {
+  it('preserves named constructors after ESM splitting', async () => {
+    const tmpDir = mkdtempSync(path.join(tmpdir(), 'gemini-proxy-test-'));
+    const entryFile = path.join(tmpDir, 'entry.ts');
+
+    // Create a minimal entry file that dynamically imports the proxy agents
+    writeFileSync(
+      entryFile,
+      `
+      export async function getAgents() {
+        const httpsMod = await import('https-proxy-agent');
+        const httpMod = await import('http-proxy-agent');
+        return {
+          https: httpsMod,
+          http: httpMod,
+        };
+      }
+      `,
+    );
+
+    // Bundle with the exact same splitting config and aliases as cliConfig
+    await esbuild.build({
+      entryPoints: { gemini: entryFile },
+      outdir: path.join(tmpDir, 'bundle'),
+      bundle: true,
+      splitting: true,
+      format: 'esm',
+      platform: 'node',
+      outExtension: { '.js': '.mjs' },
+      alias: {
+        'https-proxy-agent': path.resolve(
+          projectRoot,
+          'packages/cli/src/patches/https-proxy-agent.ts',
+        ),
+        'http-proxy-agent': path.resolve(
+          projectRoot,
+          'packages/cli/src/patches/http-proxy-agent.ts',
+        ),
+      },
+    });
+
+    // Import the bundled chunk
+    const bundledEntryUrl = pathToFileURL(
+      path.join(tmpDir, 'bundle/gemini.mjs'),
+    ).href;
+    const { getAgents } = await import(bundledEntryUrl);
+
+    const { https, http } = await getAgents();
+
+    // Verify named exports exist
+    expect(typeof https.HttpsProxyAgent).toBe('function');
+    expect(typeof http.HttpProxyAgent).toBe('function');
+
+    // Verify they are constructable
+    expect(() => new https.HttpsProxyAgent('http://127.0.0.1:9')).not.toThrow();
+    expect(() => new http.HttpProxyAgent('http://127.0.0.1:9')).not.toThrow();
+
+    // Cleanup
+    rmSync(tmpDir, { recursive: true, force: true });
+  });
+});