code: function minify(output, sourceMapFile) {
    try {
      // Try to resolve uglify-js in order to see if it does exist
      require.resolve('uglify-js');
    } catch (e) {
      if (e.code !== 'MODULE_NOT_FOUND') {
        // Something else seems to be wrong
        throw e;
      }
      // it does not exist!
      console.error('Code minimization is disabled due to missing uglify-js dependency');
      return output;
    }
    return require('uglify-js').minify(output.code, {
      sourceMap: {
        content: output.map,
        url: sourceMapFile
      }
    });
  }
docs: Run uglify to minify the compiled template, if uglify exists in the dependencies.
  
  We are using `require` instead of `import` here, because es6-modules do not allow
  dynamic imports and uglify-js is an optional dependency. Since we are inside NodeJS here, this
  should not be a problem.
  
  @param {string} output the compiled template
  @param {string} sourceMapFile the file to write the source map to.