next/dist/esm/build/webpack/plugins/copy-file-plugin.js

The React Framework

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 {
    constructor({ filePath, cacheKey, name, info }){
        this.filePath = filePath;
        this.cacheKey = cacheKey;
        this.name = name;
        this.info = info;
    }
    apply(compiler) {
        compiler.hooks.thisCompilation.tap(PLUGIN_NAME, (compilation)=>{
            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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