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import { promises as fs } from 'fs'
import loaderUtils from 'next/dist/compiled/loader-utils3'
import { sources, webpack } from 'next/dist/compiled/webpack/webpack'
const PLUGIN_NAME = 'CopyFilePlugin'
export class CopyFilePlugin {
private filePath: string
private name: string
private cacheKey: string
private info?: object
constructor({
filePath,
cacheKey,
name,
info,
}: {
filePath: string
cacheKey: string
name: string
minimize: boolean
info?: object
}) {
this.filePath = filePath
this.cacheKey = cacheKey
this.name = name
this.info = info
}
apply(compiler: webpack.Compiler) {
compiler.hooks.thisCompilation.tap(PLUGIN_NAME, (compilation: any) => {
const cache = compilation.getCache('CopyFilePlugin')
const hook = compilation.hooks.processAssets
hook.tapPromise(
{
name: PLUGIN_NAME,
stage: webpack.Compilation.PROCESS_ASSETS_STAGE_ADDITIONS,
},
async () => {
if (cache) {
const cachedResult = await cache.getPromise(
this.filePath,
this.cacheKey
)
if (cachedResult) {
const { file, source } = cachedResult
compilation.emitAsset(file, source, {
...this.info,
})
return
}
}
const content = await fs.readFile(this.filePath, 'utf8')
const file = loaderUtils.interpolateName(
{ resourcePath: this.filePath },
this.name,
{ content, context: compiler.context }
)
const source = new sources.RawSource(content)
if (cache) {
await cache.storePromise(this.filePath, this.cacheKey, {
file,
source,
})
}
compilation.emitAsset(file, source, {
...this.info,
})
}
)
})
}
}
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