blockscout/apps/explorer_web/assets/brunch-config.js

exports.config = {
  // See http://brunch.io/#documentation for docs.
  files: {
    javascripts: {
      entryPoints: {
        'js/app.js': 'js/app.js'
      },

      joinTo: {
        'js/test.js': [/^spec/, /^js/, /^node_modules/]
      }

      // To use a separate vendor.js bundle, specify two files path
      // http://brunch.io/docs/config#-files-
      // joinTo: {
      //   'js/app.js': /^js/,
      //   'js/vendor.js': /^(?!js)/
      // }
      //
      // To change the order of concatenation of files, explicitly mention here
      // order: {
      //   before: [
      //     'vendor/js/jquery-2.1.1.js',
      //     'vendor/js/bootstrap.min.js'
      //   ]
      // }
    },
    stylesheets: {
      joinTo: {
        'css/app.css': 'css/app.scss',
        'css/test.css': 'spec/support/jasmine.scss',
      }
    },
    templates: {
      joinTo: 'js/app.js'
    }
  },

  conventions: {
    // This option sets where we should place non-css and non-js assets in.
    // By default, we set this to '/assets/static'. Files in this directory
    // will be copied to `paths.public`, which is 'priv/static' by default.
    assets: /^(static)/
  },

  // Phoenix paths configuration
  paths: {
    // Dependencies and current project directories to watch
    watched: ['static', 'css', 'css/**', 'js', 'vendor', 'spec'],
    // Where to compile files to
    public: '../priv/static'
  },

  // Configure your plugins
  plugins: {
    babel: {
      presets: ['env', 'react'],

      // Do not use ES6 compiler in vendor code
      ignore: [/vendor/]
    },

    sass: {
      mode: 'native',
      precision: 8,
      allowCache: true,
      options: {
        includePaths: ['node_modules/bootstrap/scss', 'node_modules/jasmine-core/lib']
      }
    },

    postcss: {
      processors: [
        require('autoprefixer')(['last 4 versions']),
        require('csswring')()
      ]
    }
  },

  modules: {
    autoRequire: {
      'js/app.js': ['js/app'],
      'js/test.js': ['spec/spec_helper']
    }
  },

  overrides: {
    production: {
      optimize: true,
      sourceMaps: false,
      plugins: {
        autoReload: {enabled: false},
      },
      modules: {autoRequire: {'js/app.js': ['js/app']}},
      paths: {watched: ['static', 'css', 'css/**', 'js', 'vendor']},
      files: {
        javascripts: {joinTo: 'js/app.js'},
        stylesheets: {joinTo: 'css/app.css'},
      }
    }
  },

  npm: {
    enabled: true,
    globals: {
      $: 'jquery',
      jQuery: 'jquery',
      Popper: 'popper.js',
      bootstrap: 'bootstrap'
    }
  }
}