esbuild

v0.6.26

• Fast
• Rich benchmarks
• Support jsx/ts (to ES6)
• by Figma CTO (evan wallace)
• adopted by Vite/Snowpack/HUGO
• stats
  • 24k loc (source code)
  • 13k loc (tests)
  • 34k weekly downloads

tree -d

...

├── internal
│   ├── ast
│   ├── bundler
│   │   └── snapshots
│   ├── compat
│   ├── config
│   ├── fs
│   ├── lexer
│   ├── logging
│   ├── parser
│   ├── printer
│   ├── renamer
│   ├── resolver
│   ├── runtime
│   ├── sourcemap
│   └── test

...

代码量小，麻烦的是处理兼容/edge case/correctness，核心功能趋于稳定 (前阵子还支持了 tree shaking/code splitting)

• parsing
  • resolver.go
  • lexer.go
  • parser.go ~10k loc
    • parser_lower.go // a ** b -> Math.pow(a, b)
    • parser_ts.go
    • parser_json.go
    • parser_sourcemap.go
• runtime.go
  • inject js runtime
• minify
  • printer.go
  • renamer.go

Makefile & scripts

• bench 任务 (会不时更新结果到 readme)
  • rome
  • three
  • react-admin
• 借力
  • builds X using esbuild and then uses it to run X's test suite
    • make test-rollup
    • make test-sucrase
    • make test-esprima
    • make test-preact-splitting
  • runs X's test suite through esbuild
    • make uglify
    • make terser

tricks

• lib/install.ts
  • 发布各平台的 binary (esbuild-darwin-64/esbuild-linux-64/...)
  • "postinstall": "node install.js"
  • 识别平台，从 registry 下载对应的包
• internal/compat/table.go
  • golang 社区没有 compat-table（也没必要），esbuild 为了支持类似 --target=firefox57,safari11 的语法 (browerlist)，最后通过 scripts/compat-table.js，读取 compat-table 内容自动生成 go 代码供项目使用
  • internal/lexer/unicode.go 同样由脚本生成

Is this still just an "existence proof"?

issue 329

evanw:

• I'm not planning to abandon it.
• I'm imagining esbuild as a kind of "linker" for the web.
• goals
  • Be a fast bundler.
  • Inspire other bundlers to care about speed and become much faster.
  • Be a transform library for certain commonly-slow tasks to speed up other tools.
  • Add an extensibility layer to esbuild.

evanw 一点不觉得打字麻烦，乐于和社区沟通，答疑解惑动不动发长文 (对比 antd)，代码注释也很多

看到希望能激励其他 bundlers 关注工具的执行效率，快哭了

推荐看全文

notes

• 没必要被语言限制 (written in golang)
• 没必要容忍糟糕的开发者体验 (no slow bundler)
• 没必要都从头写，可以借点力 (test suite)
• 没必要都从头写，也可以借其他语言库 (compat-table/unicode-table)
• 注意：evan 还很年轻 (30 yo)

next

• tree shaking in esbuild
• esbuild architecture