@expo/metro-runtime/src/setupFastRefresh.ts

Tools for making advanced Metro bundler features work

// This needs to run before the renderer initializes.

const ReactRefreshRuntime = require('react-refresh/runtime');
ReactRefreshRuntime.injectIntoGlobalHook(global);

const Refresh = {
  performFullRefresh() {
    location.reload();
  },

  createSignatureFunctionForTransform: ReactRefreshRuntime.createSignatureFunctionForTransform,

  isLikelyComponentType: ReactRefreshRuntime.isLikelyComponentType,

  getFamilyByType: ReactRefreshRuntime.getFamilyByType,

  register: ReactRefreshRuntime.register,

  performReactRefresh() {
    if (ReactRefreshRuntime.hasUnrecoverableErrors()) {
      location.reload();
      return;
    }
    ReactRefreshRuntime.performReactRefresh();
  },
};

// The metro require polyfill can not have dependencies (applies for all polyfills).
// Expose `Refresh` by assigning it to global to make it available in the polyfill.
global[(global.__METRO_GLOBAL_PREFIX__ || '') + '__ReactRefresh'] = Refresh;