插件开发实战一：zip 压缩插件

写一个将输出压缩为 zip 包的插件。

// ZipPlugin.js
const JSZip = require('jszip');
const path = require('path');
const RawSource = require('webpack-sources').RawSource;
const zip = new JSZip();
module.exports = class ZipPlugin {
  constructor(options) {
    this.options = options;
  }
  apply(compiler) {
    compiler.hooks.emit.tapAsync('ZipPlugin', (compilation, cb) => {
        const folder = zip.folder(this.options.filename);
        for (let filename in compilation.assets) {
            // console.log('found', filename);
            const source = compilation.assets[filename].source();
            folder.file(filename, source);
        }
        zip.generateAsync({
            type: 'nodebuffer'
        }).then((content) => {
            const outputPath = path.join(
                '.',
                this.options.filename + '.zip'
            );
            console.log('output', outputPath);
            compilation.assets[outputPath] = new RawSource(content);
            cb();
        });
    });
  }
}