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const { Compilation } = require('webpack');

class RemoveSuprefluousAssetsPlugin {

apply(compiler) {

compiler.hooks.compilation.tap(

'RemoveSuprefluousAssetsPlugin',

(compilation) => {

compilation.hooks.processAssets.tap(

{

name: 'RemoveSuprefluousAssetsPlugin',

stage: Compilation.PROCESS_ASSETS_STAGE_OPTIMIZE,

},

() => this.processAssets(compilation)

);

}

);

}

processAssets(compilation) {

const names = this.getSassAssetNames(compilation.assets);

names.forEach((name) => this.filterAssets(compilation, name));

}

filterAssets(compilation, name) {

const regex = new RegExp(

`${name.substr(0, name.length - 4)}\\.((?!css).)*$`

);

Object.keys(compilation.assets)

.filter((asset) => regex.test(asset))

.forEach((asset) => compilation.deleteAsset(asset));

}

getSassAssetNames(assets) {

return Object.keys(assets).filter((asset) => asset.endsWith('.css'));

}

}

module.exports = RemoveSuprefluousAssetsPlugin;