src/plugin/plugin.js

/* eslint no-console:0 */

import path from 'path';
import fs from 'fs';
import mkdirp from 'mkdirp';
let cssString = fs.readFileSync(path.join(__dirname, './style.css'), 'utf8');
let jsString = fs.readFileSync(path.join(__dirname, './pluginmain.js'), 'utf8');


export default class VisualizerPlugin {
    constructor(opts = {filename: 'stats.html'}) {
        this.opts = opts;
    }

    apply(compiler) {
        compiler.plugin('emit', (compilation, callback) => {
            let stats = compilation.getStats().toJson({
                hash: true,
                version: true,
                timings: true,
                assets: true,
                chunks: true,
                chunkModules: true,
                modules: true,
                reasons: true,
                source: false,
            });
            let stringifiedStats = JSON.stringify(stats).replace(/</g, '\\u003c');

            let html = `<!doctype html>
                <meta charset="UTF-8">
                <title>Webpack Visualizer</title>
                <style>${cssString}</style>
                <div id="App"></div>
                <script>window.stats = ${stringifiedStats};</script>
                <script>${jsString}</script>
            `;

            let outputFile = path.join(compilation.outputOptions.path, this.opts.filename);

            mkdirp(path.dirname(outputFile), (mkdirpErr) => {
                if (mkdirpErr) {
                    console.log('webpack-visualizer-plugin: error writing stats file');
                }

                fs.writeFile(outputFile, html, (err) => {
                    if (err) {
                        console.log('webpack-visualizer-plugin: error writing stats file');
                    }

                    callback();
                });
            });
        });
    }
}