Function createPlatformFactory

packages/core/src/platform/platform.ts:72–95

(
  parentPlatformFactory: ((extraProviders?: StaticProvider[]) => PlatformRef) | null,
  name: string,
  providers: StaticProvider[] = [],
)

 * @publicApi
 */
export function createPlatformFactory(
  parentPlatformFactory: ((extraProviders?: StaticProvider[]) => PlatformRef) | null,
  name: string,
  providers: StaticProvider[] = [],
): (extraProviders?: StaticProvider[]) => PlatformRef {
  const desc = `Platform: ${name}`;
  const marker = new InjectionToken(desc);
  return (extraProviders: StaticProvider[] = []) => {
    let platform = getPlatform();
    if (!platform) {
      const platformProviders: StaticProvider[] = [
        ...providers,
        ...extraProviders,
        {provide: marker, useValue: true},
      ];

      platform =
        parentPlatformFactory?.(platformProviders) ??
        createPlatform(createPlatformInjector(platformProviders, desc));
    }

    return typeof ngServerMode !== 'undefined' && ngServerMode ? platform : assertPlatform(marker);
  };
}

/**
 * Helper function to create an instance of a platform injector (that maintains the 'platform'