●Change8

v0.25.3

Breaking Changes
📦 esbuild
⚠ 1 breaking✨ 3 features🐛 3 fixes🔧 5 symbols

Summary

This release fixes a memory leak in watch mode, adds support for custom hosts in the development server, and improves CSS and JavaScript lowering. It also introduces a safety limit for CSS nesting expansion to prevent resource exhaustion.

⚠️ Breaking Changes

  • CSS nesting expansion now has a hard-coded limit (65536 selectors). If your CSS exceeds this limit when targeting older browsers, esbuild will now fail with an error instead of attempting to generate the output.

Migration Steps

  1. If using a custom domain for development, update your --serve flag or serve() API call to include the specific host (e.g., --serve=local.example.com:8000).
  2. If your build fails with 'CSS nesting is causing too much expansion', refactor your CSS to reduce nesting depth or selector complexity.

✨ New Features

  • Allow a custom host with the development server: You can now opt-in to a single custom domain name for the local development server using --serve=host:port.
  • More concise output for repeated legal comments: Duplicate legal comments across separate files are now grouped into a single instance in the output.
  • Improved async arrow function lowering: esbuild now avoids forwarding 'this' into generated generator functions if 'this' is not used, allowing async arrow functions before super() in constructors when targeting older environments.

🐛 Bug Fixes

  • Fix memory leak with --watch=true: Fixed an issue where using the boolean flag syntax caused the garbage collector to remain disabled during long-lived processes.
  • Fix path resolution edge case: Adjusted resolution logic to match Node.js behavior when a path ends with '..' and a directory shares a name with a file.
  • Fix lowered async arrow functions before super() where 'this' was incorrectly captured even if unused.

🔧 Affected Symbols

serve--serve--watchcliCSS