limiter/dist/esm/RequestQueue.js

A generic rate limiter for the web and node.js. Useful for API clients, web crawling, or other tasks that need to be throttled

/** Serialize waiting requests so a backlog needs only one active timer. */
export class RequestQueue {
    tail;
    run(request) {
        const result = this.tail ? this.tail.then(request) : request();
        const tail = result.then(() => undefined, () => undefined);
        this.tail = tail;
        void tail.then(() => {
            if (this.tail === tail)
                this.tail = undefined;
        });
        return result;
    }
}
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