Proxy broken: HttpsProxyAgent is not a constructor (esbuild CJS interop)

[yan5xu]

Bug Description

When https_proxy or HTTP_PROXY environment variables are set, Gemini CLI crashes with:

TypeError: HttpsProxyAgent is not a constructor
    at #prepareRequest (chunk-JS5WSGB2.js:14137:26)

Root Cause

gaxios (via @google/genai) dynamically imports https-proxy-agent:

this.#proxyAgent ||= (await import('https-proxy-agent')).HttpsProxyAgent;

This works correctly at runtime because Node.js's native CJS interop detects named exports from CJS modules. However, esbuild's code splitting (splitting: true) bundles https-proxy-agent (a CJS package) into a separate ESM chunk with only a default export:

// Generated chunk: dist-T73EYRDX.js
export default require_dist();  // { HttpsProxyAgent: [Function] }

When gaxios imports this chunk, .HttpsProxyAgent is undefined (it's on .default.HttpsProxyAgent), causing new undefined() → TypeError.

Reproduction

# Set any HTTP proxy
export https_proxy=http://127.0.0.1:7890

# Run gemini
gemini --prompt "hello" --yolo
# → TypeError: HttpsProxyAgent is not a constructor

Environment

• Gemini CLI: 0.37.1 (also affects 0.39.0-nightly based on source review)
• Node.js: v24.7.0
• OS: macOS (Darwin)

Fix

Mark https-proxy-agent as external in esbuild config and add it as a direct dependency, so Node.js's native CJS interop handles the import correctly. PR incoming.

[gemini-cli]

Found possible duplicate issues:

• Proxy defined in environment broken: "TypeError: HttpsProxyAgent is not a constructor" when using proxy options #24471
• API Error: HttpsProxyAgent is not a constructor #24497

If you believe this is not a duplicate, please remove the status/possible-duplicate label.

[Adib234]

Thank you for the excellent technical analysis and for identifying the root cause related to esbuild code splitting. This is a duplicate of #24471, which was the original report of this issue. We are closing this to consolidate tracking, but please link your PR to #24471 so the maintainers can review it there!