Function standardizeCallbacks

tfjs-layers/src/base_callbacks.ts:476–495

(
    callbacks: BaseCallback|BaseCallback[]|CustomCallbackArgs|
    CustomCallbackArgs[],
    yieldEvery: YieldEveryOptions)

 * Standardize callbacks or configurations of them to an Array of callbacks.
 */
export function standardizeCallbacks(
    callbacks: BaseCallback|BaseCallback[]|CustomCallbackArgs|
    CustomCallbackArgs[],
    yieldEvery: YieldEveryOptions): BaseCallback[] {
  if (callbacks == null) {
    callbacks = {} as BaseCallback;
  }
  if (callbacks instanceof BaseCallback) {
    return [callbacks];
  }
  if (Array.isArray(callbacks) && callbacks[0] instanceof BaseCallback) {
    return callbacks as BaseCallback[];
  }
  // Convert custom callback configs to custom callback objects.
  const callbackConfigs =
      generic_utils.toList<BaseCallback | CustomCallbackArgs>(
        callbacks) as CustomCallbackArgs[];
  return callbackConfigs.map(
      callbackConfig => new CustomCallback(callbackConfig, yieldEvery));
}

export declare type BaseCallbackConstructor = {
  new (): BaseCallback