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import type { webpack } from 'next/dist/compiled/webpack/webpack'
import { deleteCache } from '../../../server/dev/require-cache'
import { clearModuleContext } from '../../../server/web/sandbox'
import path from 'path'
type Compiler = webpack.Compiler
type WebpackPluginInstance = webpack.WebpackPluginInstance
const RUNTIME_NAMES = ['webpack-runtime', 'webpack-api-runtime']
const PLUGIN_NAME = 'NextJsRequireCacheHotReloader'
// This plugin flushes require.cache after emitting the files. Providing 'hot reloading' of server files.
export class NextJsRequireCacheHotReloader implements WebpackPluginInstance {
prevAssets: any = null
serverComponents: boolean
constructor(opts: { serverComponents: boolean }) {
this.serverComponents = opts.serverComponents
}
apply(compiler: Compiler) {
compiler.hooks.assetEmitted.tap(PLUGIN_NAME, (_file, { targetPath }) => {
// Clear module context in this process
clearModuleContext(targetPath)
deleteCache(targetPath)
})
compiler.hooks.afterEmit.tapPromise(PLUGIN_NAME, async (compilation) => {
for (const name of RUNTIME_NAMES) {
const runtimeChunkPath = path.join(
compilation.outputOptions.path!,
`${name}.js`
)
deleteCache(runtimeChunkPath)
}
// we need to make sure to clear all server entries from cache
// since they can have a stale webpack-runtime cache
// which needs to always be in-sync
const entries = [...compilation.entrypoints.keys()].filter((entry) => {
const isAppPath = entry.toString().startsWith('app/')
return entry.toString().startsWith('pages/') || isAppPath
})
for (const page of entries) {
const outputPath = path.join(
compilation.outputOptions.path!,
page + '.js'
)
deleteCache(outputPath)
}
})
}
}
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