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((source, subscriber) => {
const { leading = true, trailing = false } = config !== null && config !== void 0 ? config : {};
let hasValue = false;
let sendValue = null;
let throttled = null;
let isComplete = false;
const endThrottling = () => {
throttled === null || throttled === void 0 ? void 0 : throttled.unsubscribe();
throttled = null;
if (trailing) {
send();
isComplete && subscriber.complete();
}
};
const cleanupThrottling = () => {
throttled = null;
isComplete && subscriber.complete();
};
const startThrottle = (value) => (throttled = innerFrom(durationSelector(value)).subscribe(createOperatorSubscriber(subscriber, endThrottling, cleanupThrottling)));
const send = () => {
if (hasValue) {
hasValue = false;
const value = sendValue;
sendValue = null;
subscriber.next(value);
!isComplete && startThrottle(value);
}
};
source.subscribe(createOperatorSubscriber(subscriber, (value) => {
hasValue = true;
sendValue = value;
!(throttled && !throttled.closed) && (leading ? send() : startThrottle(value));
}, () => {
isComplete = true;
!(trailing && hasValue && throttled && !throttled.closed) && subscriber.complete();
}));
});
}
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