Function asyncOf

Extension/src/Utility/Async/iterators.ts:139–161

(...items: (undefined | Promise<undefined> | Some<T>)[])

export type Some<T> = T | Promise<T> | AsyncIterable<T | undefined> | AsyncIterable<Promise<T> | Promise<undefined>> | Iterable<T> | Iterable<Promise<T>>;

export async function* asyncOf<T>(...items: (undefined | Promise<undefined> | Some<T>)[]): AsyncIterable<NonNullable<T>> {
    if (is.asyncIterable(items)) {
        for await (const item of items) {
            if (is.asyncIterable(item) || is.iterable(item)) {
                yield* item as any;
                continue;
            }
            yield item as any;
        }
        return;
    }

    for (const item of items) {
        // skip undefined
        if (item) {
            if (is.asyncIterable(item) || is.iterable(item)) {
                yield* item as any;
                continue;
            }
            yield item as any;
        }
    }
}

/**
 * A substitute for Promise.race()