83 lines
2.4 KiB
TypeScript
83 lines
2.4 KiB
TypeScript
import { webpack } from 'next/dist/compiled/webpack/webpack'
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import { isWebpack5 } from 'next/dist/compiled/webpack/webpack'
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import { realpathSync } from 'fs'
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import path from 'path'
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function deleteCache(filePath: string) {
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try {
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delete require.cache[realpathSync(filePath)]
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} catch (e) {
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if (e.code !== 'ENOENT') throw e
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} finally {
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delete require.cache[filePath]
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}
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}
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const PLUGIN_NAME = 'NextJsRequireCacheHotReloader'
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// This plugin flushes require.cache after emitting the files. Providing 'hot reloading' of server files.
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export class NextJsRequireCacheHotReloader implements webpack.Plugin {
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prevAssets: any = null
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previousOutputPathsWebpack5: Set<string> = new Set()
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currentOutputPathsWebpack5: Set<string> = new Set()
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apply(compiler: webpack.Compiler) {
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if (isWebpack5) {
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// @ts-ignored Webpack has this hooks
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compiler.hooks.assetEmitted.tap(
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PLUGIN_NAME,
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(_file: any, { targetPath }: any) => {
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this.currentOutputPathsWebpack5.add(targetPath)
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deleteCache(targetPath)
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}
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)
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compiler.hooks.afterEmit.tap(PLUGIN_NAME, (compilation) => {
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const runtimeChunkPath = path.join(
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compilation.outputOptions.path,
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'webpack-runtime.js'
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)
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deleteCache(runtimeChunkPath)
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// we need to make sure to clear all server entries from cache
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// since they can have a stale webpack-runtime cache
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// which needs to always be in-sync
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const entries = [...compilation.entries.keys()].filter((entry) =>
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entry.toString().startsWith('pages/')
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)
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entries.forEach((page) => {
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const outputPath = path.join(
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compilation.outputOptions.path,
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page + '.js'
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)
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deleteCache(outputPath)
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})
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})
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this.previousOutputPathsWebpack5 = new Set(
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this.currentOutputPathsWebpack5
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)
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this.currentOutputPathsWebpack5.clear()
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return
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}
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compiler.hooks.afterEmit.tapAsync(PLUGIN_NAME, (compilation, callback) => {
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const { assets } = compilation
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if (this.prevAssets) {
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for (const f of Object.keys(assets)) {
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deleteCache(assets[f].existsAt)
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}
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for (const f of Object.keys(this.prevAssets)) {
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if (!assets[f]) {
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deleteCache(this.prevAssets[f].existsAt)
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}
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}
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}
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this.prevAssets = assets
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callback()
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})
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}
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}
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