Function preinitScript

packages/react-dom-bindings/src/client/ReactFiberConfigDOM.js:4908–4959

(src: string, options?: ?PreinitScriptOptions)

}

function preinitScript(src: string, options?: ?PreinitScriptOptions) {
  previousDispatcher.X(/* preinitScript */ src, options);

  const ownerDocument = getGlobalDocument();
  if (ownerDocument && src) {
    const scripts = getResourcesFromRoot(ownerDocument).hoistableScripts;

    const key = getScriptKey(src);

    // Check if this resource already exists
    let resource = scripts.get(key);
    if (resource) {
      // We can early return. The resource exists and there is nothing
      // more to do
      return;
    }

    // Attempt to hydrate instance from DOM
    let instance: null | Instance = ownerDocument.querySelector(
      getScriptSelectorFromKey(key),
    );
    if (!instance) {
      // Construct a new instance and insert it
      const scriptProps = Object.assign(
        ({
          src,
          async: true,
        }: ScriptProps),
        options,
      );
      // Adopt certain preload props
      const preloadProps = preloadPropsMap.get(key);
      if (preloadProps) {
        adoptPreloadPropsForScript(scriptProps, preloadProps);
      }
      instance = ownerDocument.createElement('script');
      markNodeAsHoistable(instance);
      setInitialProperties(instance, 'link', scriptProps);
      (ownerDocument.head: any).appendChild(instance);
    }

    // Construct a Resource and cache it
    resource = {
      type: 'script',
      instance,
      count: 1,
      state: null,
    };
    scripts.set(key, resource);
    return;
  }
}

function preinitModuleScript(
  src: string,