PR #26551: fix: externalize https-proxy-agent in bundle

• Repository: google-gemini/gemini-cli
• Author: tejakusireddy
• State: open | merged: False
• Link: https://github.com/google-gemini/gemini-cli/pull/26551

Description (problem / solution / changelog)

Summary

Fixes #26533.

Externalizes https-proxy-agent from the main esbuild bundle so the Vertex AI / gaxios proxy path can load it through Node's runtime module resolver instead of using the bundled copy.

This avoids proxy-agent runtime failures when HTTP_PROXY / HTTPS_PROXY are set.

Details

The proxy path in gaxios lazily imports https-proxy-agent. When bundled into the CLI output, that dependency can hit bundling/runtime interop problems. Keeping it external preserves the package's normal runtime export shape.

This PR also adds https-proxy-agent to the root runtime dependencies so the published CLI package can resolve the externalized import after installation.

Related Issues

Fixes #26533

How to Validate

• npx prettier --check esbuild.config.js package.json package-lock.json
• npm run bundle
• npm pack
• Installed the packed tarball into a clean temp project
• Verified require.resolve('https-proxy-agent') succeeds from the clean installed package
• npm run preflight
• git diff --check

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any) — no breaking changes
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker

Changed files

• esbuild.config.js (modified, +1/-0)
• package-lock.json (modified, +1/-0)
• package.json (modified, +1/-0)