limiter/dist/cjs/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

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.RequestQueue = void 0;
/** Serialize waiting requests so a backlog needs only one active timer. */
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;
    }
}
exports.RequestQueue = RequestQueue;
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