JavaScript 的壓縮器 esbuild

esbuild 是個 JavaScript bundler & minifier，在 GitHub 上的副標提到了重點在於速度：

An extremely fast JavaScript bundler and minifier

從壓縮時間可以看出來優勢：

另外從最終的檔案大小也可以看出來，與最小的 rollup + terser 組合沒有差太多：

實際拿個 jQuery 跑看看，可以看出來壓縮的效果還行：

-rw-r--r-- 1 gslin staff  89228 Feb 19 06:03 jquery-3.4.1-esbuild.min.js
-rw-r--r-- 1 gslin staff 280364 May  2  2019 jquery-3.4.1.js
-rw-r--r-- 1 gslin staff  88145 May  2  2019 jquery-3.4.1.min.js

速度主要是透過 Golang 並且平行化運算達到的：

• It's written in Go, a language that compiles to native code
• Parsing, printing, and source map generation are all fully parallelized
• Everything is done in very few passes without expensive data transformations
• Code is written with speed in mind, and tries to avoid unnecessary allocations

不過作者有提到這個專案畢竟比較新，還沒有被時間磨練過，可能會有些 bug：

This is a hobby project that I wrote over the 2019-2020 winter break. I believe that it's relatively complete and functional. However, it's brand new code and probably has a lot of bugs. It also hasn't yet been used in production by anyone. Use at your own risk.

可以先放一陣子看看，讓一些先賢先烈把比較大的 bug 踩一踩修一修...