// lets you wait until it is uncorked by someone before running
export default class DedupAwaiter<T> {
	private promise: Promise<T> | null;

	constructor(
		private func: () => Promise<T>
	) {}

	public async call(): Promise<T> {
		if (!this.promise) {
			let result: T | null = null;
			let promise = new Promise<T>(async (resolve) => {
				resolve(await this.func());
			});
			// This if statement could trigger if func is not async
			// typescript is missing some fun stuff going on here :)
			if (result) {
				return result;
			} else {
				this.promise = promise;
			}
		}
		return await this.promise;
	}
}