server doesn't need to be contenthashing at all (#25251)

contenthashing is not useful for the server

cc @ijjk

packages/next/build/webpack-config.ts

@@ -825,7 +825,7 @@ export default async function getBaseWebpackConfig(
       splitChunks: isServer
         ? isWebpack5
           ? ({
-              filename: `${dev ? '[name]' : '[name].[contenthash]'}.js`,
+              filename: '[name].js',
               // allow to split entrypoints
               chunks: 'all',
               // size of files is not so relevant for server build
@@ -931,7 +931,7 @@ export default async function getBaseWebpackConfig(
         : 'static/webpack/[hash].hot-update.json',
       // This saves chunks with the name given via `import()`
       chunkFilename: isServer
-        ? `${dev ? '[name]' : '[name].[contenthash]'}.js`
+        ? '[name].js'
         : `static/chunks/${isDevFallback ? 'fallback/' : ''}${
             dev ? '[name]' : '[name].[contenthash]'
           }.js`,

test/integration/build-output/test/index.test.js

@@ -129,7 +129,7 @@ describe('Build Output', () => {
           expect(parseFloat(err404Size)).toBeCloseTo(gz ? 3.06 : 8.15, 1)
           expect(err404Size.endsWith('kB')).toBe(true)
 
-          expect(parseFloat(err404FirstLoad)).toBeCloseTo(gz ? 66.5 : 203, 1)
+          expect(parseFloat(err404FirstLoad)).toBeCloseTo(gz ? 66.4 : 203, 1)
           expect(err404FirstLoad.endsWith('kB')).toBe(true)
 
           expect(parseFloat(sharedByAll)).toBeCloseTo(gz ? 63.4 : 195, 1)

yarn.lock

@@ -2383,11 +2383,6 @@
     call-me-maybe "^1.0.1"
     glob-to-regexp "^0.3.0"
 
-"@next/eslint-plugin-next@^10.1.3":
-  version "10.1.3"
-  resolved "https://registry.yarnpkg.com/@next/eslint-plugin-next/-/eslint-plugin-next-10.1.3.tgz#739743aa33aed28d97e670b9f80b84440cf2a3c7"
-  integrity sha512-KrZUb6cHXt/rPhN9bSrlVLAq+9LyNOWurqbrUww3OXmrFlXBDI8W6Z0ToDkQMkIH6gTtmpGbuctxCkQ2pgeXzQ==
-
 "@nodelib/[email protected]":
   version "2.1.3"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.3.tgz#3a582bdb53804c6ba6d146579c46e52130cf4a3b"