Gulp generating schema error

[trinile]

Receiving Reference error: regeneratorRuntime not defined.
Adding below code doesn't seem to work.

    .pipe(babel({
      presets: [ 'es2015', 'stage-0'],
      plugins: ['transform-object-rest-spread', ['transform-runtime', {
      'polyfill': false,
      'regenerator': true
    }]],
    }))
});

Async functions and generators cannot be used in the script for generating schema.
Issue is babel-polyfill needs to be required. Alternatives? babel-transform-runtime.
Current fix: using npm script to watch schema files and rebuild upon changes.
Gulp file is not currently useful at the moment.