import { WrappingDec } from "./utils";

/**
 * Decorates an async function that should only be called once.
 * Highly similar to Memoize, but clears state if the promise throws.
 */
export const PromiseOnce = WrappingDec(<T>(f: (...args: any[]) => Promise<T> | T) => {
    let currentPromise: Promise<any> = null;

    return function () {
        if (currentPromise) return currentPromise;
        const rawPromise = (async () => await f.call(this))();
        rawPromise.catch((e) => {
            currentPromise = null;
        })
        // currentPromise = fromPromise(rawPromise);
        currentPromise = rawPromise;
        return currentPromise;
    }
})