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.hooks.emit.tap('webpack-visualizer', (compilation) => {
            let stats = compilation.getStats().toJson({chunkModules: true});
            let stringifiedStats = JSON.stringify(stats);
            stringifiedStats = stringifiedStats.replace(/</g, '&lt;').replace(/</g, '&gt;');

            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');
                    }
                });
            });
        });
    }
}