code: function flow() {
    return {
      name: 'flow-remove-types',
      transform: (code) => ({
        code: flowRemoveTypes(code).toString(),
        map: null
      })
    };
  }
docs: kudos https://github.com/openstreetmap/iD/pull/4885 Using this instead of rollup-plugin-flow due to https://github.com/leebyron/rollup-plugin-flow/issues/5