@segment/analytics-next/src/lib/p-while.ts

Analytics Next (aka Analytics 2.0) is the latest version of Segment’s JavaScript SDK - enabling you to send your data to any tool without having to learn, test, or use a new API every time.

export const pWhile = async <T>(
  condition: (value: T | undefined) => boolean,
  action: () => T | PromiseLike<T>
): Promise<void> => {
  const loop = async (actionResult: T | undefined): Promise<void> => {
    if (condition(actionResult)) {
      return loop(await action())
    }
  }

  return loop(undefined)
}