new HtmlPlugin({
        scriptLoading: 'module',
        templateContent: ({ compilation }) => {
          const assets = compilation.getAssets()
          const pages = pagesManifest.map(({ chunk, path, title, data }) => {
            const scripts = assets
              .map(({ name }) => name)
              .filter(name => new RegExp(`[/.]${chunk}\\.(.+)\\.js$`).test(name))

            return { path, title, scripts, data }
          })

          if (production) {
            const assetsWithSource = assets
              .filter(({ name }) => /^scripts\/.+\.js$/.test(name))
              .map(({ name, source }) => ({
                url: `/${name}`,
  ----------->  source: source.source(),
                parentPaths: pages.filter(({ scripts }) => scripts.includes(name)).map(({ path }) => path)
              }))

            writeFileSync(join(__dirname, 'public', 'assets.js'), JSON.stringify(assetsWithSource))
          }

          return htmlTemplate(pages)
        }
      }),