const runUpdatedModule = function()

in packages/metro-runtime/src/polyfills/require.js [734:805]
59 lines of code
14 McCabe index (conditional complexity)

  const runUpdatedModule = function (
    id: ModuleID,
    factory?: FactoryFn,
    dependencyMap?: DependencyMap,
  ): boolean {
    const mod = modules[id];
    if (mod == null) {
      throw new Error('[Refresh] Expected to find the module.');
    }

    const {hot} = mod;
    if (!hot) {
      throw new Error('[Refresh] Expected module.hot to always exist in DEV.');
    }

    if (hot._disposeCallback) {
      try {
        hot._disposeCallback();
      } catch (error) {
        console.error(
          `Error while calling dispose handler for module ${id}: `,
          error,
        );
      }
    }

    if (factory) {
      mod.factory = factory;
    }
    if (dependencyMap) {
      mod.dependencyMap = dependencyMap;
    }
    mod.hasError = false;
    mod.error = undefined;
    mod.importedAll = EMPTY;
    mod.importedDefault = EMPTY;
    mod.isInitialized = false;
    const prevExports = mod.publicModule.exports;
    mod.publicModule.exports = {};
    hot._didAccept = false;
    hot._acceptCallback = null;
    hot._disposeCallback = null;
    metroRequire(id);

    if (mod.hasError) {
      // This error has already been reported via a redbox.
      // We know it's likely a typo or some mistake that was just introduced.
      // Our goal now is to keep the rest of the application working so that by
      // the time user fixes the error, the app isn't completely destroyed
      // underneath the redbox. So we'll revert the module object to the last
      // successful export and stop propagating this update.
      mod.hasError = false;
      mod.isInitialized = true;
      mod.error = null;
      mod.publicModule.exports = prevExports;
      // We errored. Stop the update.
      return true;
    }

    if (hot._acceptCallback) {
      try {
        hot._acceptCallback();
      } catch (error) {
        console.error(
          `Error while calling accept handler for module ${id}: `,
          error,
        );
      }
    }
    // No error.
    return false;
  };