ix/asynciterable/operators/throttle.mjs

The Interactive Extensions for JavaScript

import { __asyncGenerator, __asyncValues, __await } from "tslib";
import { AsyncIterableX } from '../asynciterablex.mjs';
import { wrapWithAbort } from './withabort.mjs';
import { throwIfAborted } from '../../aborterror.mjs';
/** @ignore */
export class ThrottleAsyncIterable extends AsyncIterableX {
    constructor(source, time) {
        super();
        this._source = source;
        this._time = time;
    }
    [Symbol.asyncIterator](signal) {
        return __asyncGenerator(this, arguments, function* _a() {
            var _b, e_1, _c, _d;
            throwIfAborted(signal);
            let currentTime;
            let previousTime;
            try {
                for (var _e = true, _f = __asyncValues(wrapWithAbort(this._source, signal)), _g; _g = yield __await(_f.next()), _b = _g.done, !_b; _e = true) {
                    _d = _g.value;
                    _e = false;
                    const item = _d;
                    currentTime = Date.now();
                    if (!previousTime || currentTime - previousTime > this._time) {
                        previousTime = currentTime;
                        yield yield __await(item);
                    }
                }
            }
            catch (e_1_1) { e_1 = { error: e_1_1 }; }
            finally {
                try {
                    if (!_e && !_b && (_c = _f.return)) yield __await(_c.call(_f));
                }
                finally { if (e_1) throw e_1.error; }
            }
        });
    }
}
/**
 * Throttles the source async-iterable sequence so that it doesn't emit more than one value during the given timeframe.
 *
 * @template TSource The type of elements in the source sequence.
 * @param {number} time The time in milliseconds to throttle the source sequence.
 * @returns {MonoTypeOperatorAsyncFunction<TSource>} The source sequence throttled by the given timeframe.
 */
export function throttle(time) {
    return function throttleOperatorFunction(source) {
        return new ThrottleAsyncIterable(source, time);
    };
}

//# sourceMappingURL=throttle.mjs.map