enableFiber.js

// @flow

/**
 * Enables Fiber by changing the ReactNativeFeatureFlags.js file. This is likely
 * to break when updating React Native, make sure the file hasn't changed location.
 */
const path = require('path');
const { sed } = require('shelljs');

const REACT_FLAGS_FILE = path.resolve(
  __dirname,
  '../node_modules/react-native/Libraries/Renderer/shims/ReactNativeFeatureFlags.js',
);
sed('-i', 'useFiber: false,', 'useFiber: true,', REACT_FLAGS_FILE);