@lifaon/rx-js-light

Version:
Blazing fast Observables
44 lines (43 loc) • 1.45 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.throttleTimeObservable = void 0;
var create_timeout_1 = require("../../../../../../misc/timer/create-timeout.cjs");
function throttleTimeObservable(subscribe, duration, _a) {
  var _b = _a === void 0 ? {} : _a, _c = _b.leading, leading = _c === void 0 ? true : _c, _d = _b.trailing, trailing = _d === void 0 ? true : _d;
  return function (emit) {
    var lastSendValueTime = leading ? Number.NEGATIVE_INFINITY : Number.POSITIVE_INFINITY;
    var abortTimeout = null;
    var trailingValue;
    var _emit = function (value) {
      lastSendValueTime = Date.now();
      emit(value);
    };
    var unsubscribe = subscribe(function (value) {
      var elapsedTime = Math.max(0, Date.now() - lastSendValueTime);
      if (elapsedTime >= duration) {
        if (abortTimeout !== null) {
          abortTimeout();
          abortTimeout = null;
        }
        _emit(value);
      } else if (trailing) {
        trailingValue = value;
        if (abortTimeout === null) {
          abortTimeout = (0, create_timeout_1.createTimeout)(function () {
            abortTimeout = null;
            _emit(trailingValue);
          }, duration - elapsedTime);
        }
      }
    });
    return function () {
      unsubscribe();
      if (abortTimeout !== null) {
        abortTimeout();
      }
    };
  };
}
exports.throttleTimeObservable = throttleTimeObservable;