throttle.js
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import { operate } from '../util/lift';
import { createOperatorSubscriber } from './OperatorSubscriber';
import { innerFrom } from '../observable/innerFrom';
export function throttle(durationSelector, config) {
return operate(function (source, subscriber) {
var _a = config !== null && config !== void 0 ? config : {}, _b = _a.leading, leading = _b === void 0 ? true : _b, _c = _a.trailing, trailing = _c === void 0 ? false : _c;
var hasValue = false;
var sendValue = null;
var throttled = null;
var isComplete = false;
var endThrottling = function () {
throttled === null || throttled === void 0 ? void 0 : throttled.unsubscribe();
throttled = null;
if (trailing) {
send();
isComplete && subscriber.complete();
}
};
var cleanupThrottling = function () {
throttled = null;
isComplete && subscriber.complete();
};
var startThrottle = function (value) {
return (throttled = innerFrom(durationSelector(value)).subscribe(createOperatorSubscriber(subscriber, endThrottling, cleanupThrottling)));
};
var send = function () {
if (hasValue) {
hasValue = false;
var value = sendValue;
sendValue = null;
subscriber.next(value);
!isComplete && startThrottle(value);
}
};
source.subscribe(createOperatorSubscriber(subscriber, function (value) {
hasValue = true;
sendValue = value;
!(throttled && !throttled.closed) && (leading ? send() : startThrottle(value));
}, function () {
isComplete = true;
!(trailing && hasValue && throttled && !throttled.closed) && subscriber.complete();
}));
});
}
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