Webpack4 package hash remains the same, just add mode.

Today we encountered a problem: webpack packaging hash remains the same, but every time you add mode, you can pack hash and change it. Why

    output = {
        path: outputDir,
        filename: "[name].js?[hash]",
        chunkFilename: "[name].js?[hash]"
      }

later found that it would be better without adding mode,

const config = {
  mode: process.env.NODE_ENV || "production",
  devtool: "-sharpcheap-module-eval-source-map",
   // ...
}
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