gatsby/dist/utils/gatsby-webpack-stats-extractor.js

"use strict";

const fs = require(`fs-extra`);

const path = require(`path`);

class GatsbyWebpackStatsExtractor {
  constructor(options) {
    this.plugin = {
      name: `GatsbyWebpackStatsExtractor`
    };
    this.options = options || {};
  }

  apply(compiler) {
    compiler.hooks.done.tapAsync(this.plugin.name, (stats, done) => {
      let assets = {};
      let assetsMap = {};

      for (let chunkGroup of stats.compilation.chunkGroups) {
        if (chunkGroup.name) {
          let files = [];

          for (let chunk of chunkGroup.chunks) {
            files.push(...chunk.files);
          }

          assets[chunkGroup.name] = files.filter(f => f.slice(-4) !== `.map`);
          assetsMap[chunkGroup.name] = files.filter(f => f.slice(-4) !== `.map` && f.slice(0, chunkGroup.name.length) === chunkGroup.name).map(filename => `/${filename}`);
        }
      }

      const webpackStats = Object.assign({}, stats.toJson({
        all: false,
        chunkGroups: true
      }), {
        assetsByChunkName: assets
      });
      fs.writeFile(path.join(`public`, `chunk-map.json`), JSON.stringify(assetsMap), () => {
        fs.writeFile(path.join(`public`, `webpack.stats.json`), JSON.stringify(webpackStats), done);
      });
    });
  }

}

module.exports = GatsbyWebpackStatsExtractor;
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