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webpack 中 chunkhash 和 contenthash 有什么区别 #6

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fengzilong opened this issue Dec 6, 2019 · 0 comments

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fengzilong commented Dec 6, 2019 •

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简言之：chunkhash 无法实现 Long Term Caching

一个 chunk 可能包含不同类型的资源，最终会产出多个文件，比如 JS / CSS，如果使用 chunkhash，当该 chunk 中的 css 变化时，会导致整体的 chunkhash 发生变化，从而 js 的文件名也会受到影响，缓存失效

而 contenthash 是针对文件级别的，当一个文件本身的内容不发生变化时，hash 值就不会发生变化

题外话：为什么有了 contenthash，还需要 chunkhash 呢？

chunkhash 可能有特殊的应用场景，更多的是出于向下兼容的考虑

参考：
webpack/webpack.js.org#2096

fengzilong added the webpack label

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