Bump esbuild from 0.15.17 to 0.15.18

[dependabot]

Bumps esbuild from 0.15.17 to 0.15.18.

Release notes

Sourced from esbuild's releases.

v0.15.18

• Performance improvements for both JS and CSS

  This release brings noticeable performance improvements for JS parsing and for CSS parsing and printing. Here's an example benchmark for using esbuild to pretty-print a single large minified CSS file and JS file:

  Test case	Previous release	This release
  4.8mb CSS file	19ms	11ms (1.7x faster)
  5.8mb JS file	36ms	32ms (1.1x faster)

  The performance improvements were very straightforward:

  • Identifiers were being scanned using a generic character advancement function instead of using custom inline code. Advancing past each character involved UTF-8 decoding as well as updating multiple member variables. This was sped up using loop that skips UTF-8 decoding entirely and that only updates member variables once at the end. This is faster because identifiers are plain ASCII in the vast majority of cases, so Unicode decoding is almost always unnecessary.

  • CSS identifiers and CSS strings were still being printed one character at a time. Apparently I forgot to move this part of esbuild's CSS infrastructure beyond the proof-of-concept stage. These were both very obvious in the profiler, so I think maybe I have just never profiled esbuild's CSS printing before?

  • There was unnecessary work being done that was related to source maps when source map output was disabled. I likely haven't observed this before because esbuild's benchmarks always have source maps enabled. This work is now disabled when it's not going to be used.

  I definitely should have caught these performance issues earlier. Better late than never I suppose.

Changelog

Sourced from esbuild's changelog.

0.15.18

• Performance improvements for both JS and CSS

  This release brings noticeable performance improvements for JS parsing and for CSS parsing and printing. Here's an example benchmark for using esbuild to pretty-print a single large minified CSS file and JS file:

  Test case	Previous release	This release
  4.8mb CSS file	19ms	11ms (1.7x faster)
  5.8mb JS file	36ms	32ms (1.1x faster)

  The performance improvements were very straightforward:

  • Identifiers were being scanned using a generic character advancement function instead of using custom inline code. Advancing past each character involved UTF-8 decoding as well as updating multiple member variables. This was sped up using loop that skips UTF-8 decoding entirely and that only updates member variables once at the end. This is faster because identifiers are plain ASCII in the vast majority of cases, so Unicode decoding is almost always unnecessary.

  • CSS identifiers and CSS strings were still being printed one character at a time. Apparently I forgot to move this part of esbuild's CSS infrastructure beyond the proof-of-concept stage. These were both very obvious in the profiler, so I think maybe I have just never profiled esbuild's CSS printing before?

  • There was unnecessary work being done that was related to source maps when source map output was disabled. I likely haven't observed this before because esbuild's benchmarks always have source maps enabled. This work is now disabled when it's not going to be used.

  I definitely should have caught these performance issues earlier. Better late than never I suppose.

Commits

• 2953831 publish 0.15.18 to npm
• a3ba2b2 perf release notes
• f0d8fdd oops: skip source maps for improved performance
• e49e093 css: optimize printing quoted unescaped strings
• a193324 css: improve identifier printing performance
• 83b5580 css: pretty-print test failures
• 2b8883c css: improve lexer identifier parsing performance
• f6f8b27 js: improve lexer identifier parsing performance
• decf208 restrict gc disable to not serve or watch mode
• 2030df1 don't disable the gc with multiple entry points
• Additional commits viewable in compare view

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