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next.js/server/build/plugins/combine-assets-plugin.js

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// This plugin combines a set of assets into a single asset
// This should be only used with text assets,
// otherwise the result is unpredictable.
export default class CombineAssetsPlugin {
constructor ({ input, output }) {
this.input = input
this.output = output
}
apply (compiler) {
compiler.plugin('after-compile', (compilation, callback) => {
let newSource = ''
this.input.forEach((name) => {
const asset = compilation.assets[name]
if (!asset) return
newSource += `${asset.source()}\n`
// We keep existing assets since that helps when analyzing the bundle
})
compilation.assets[this.output] = {
source: () => newSource,
size: () => newSource.length
}
callback()
})
}
}