1 | import { MonoTypeOperatorFunction, SchedulerLike } from '../types';
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2 | /**
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3 | * Emits a value from the source Observable, then ignores subsequent source
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4 | * values for `duration` milliseconds, then repeats this process.
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5 | *
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6 | * <span class="informal">Lets a value pass, then ignores source values for the
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7 | * next `duration` milliseconds.</span>
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8 | *
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9 | * ![](throttleTime.png)
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10 | *
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11 | * `throttleTime` emits the source Observable values on the output Observable
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12 | * when its internal timer is disabled, and ignores source values when the timer
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13 | * is enabled. Initially, the timer is disabled. As soon as the first source
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14 | * value arrives, it is forwarded to the output Observable, and then the timer
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15 | * is enabled. After `duration` milliseconds (or the time unit determined
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16 | * internally by the optional `scheduler`) has passed, the timer is disabled,
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17 | * and this process repeats for the next source value. Optionally takes a
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18 | * {@link SchedulerLike} for managing timers.
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19 | *
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20 | * ## Examples
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21 | *
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22 | * #### Limit click rate
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23 | *
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24 | * Emit clicks at a rate of at most one click per second
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25 | * ```ts
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26 | * import { fromEvent } from 'rxjs';
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27 | * import { throttleTime } from 'rxjs/operators';
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28 | *
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29 | * const clicks = fromEvent(document, 'click');
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30 | * const result = clicks.pipe(throttleTime(1000));
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31 | * result.subscribe(x => console.log(x));
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32 | * ```
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33 | *
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34 | * #### Double Click
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35 | *
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36 | * The following example only emits clicks which happen within a subsequent
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37 | * delay of 400ms of the previous click. This for example can emulate a double
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38 | * click. It makes use of the `trailing` parameter of the throttle configuration.
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39 | *
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40 | * ```ts
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41 | * import { fromEvent, asyncScheduler } from 'rxjs';
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42 | * import { throttleTime, withLatestFrom } from 'rxjs/operators';
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43 | *
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44 | * // defaultThottleConfig = { leading: true, trailing: false }
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45 | * const throttleConfig = {
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46 | * leading: false,
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47 | * trailing: true
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48 | * }
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49 | *
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50 | * const click = fromEvent(document, 'click');
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51 | * const doubleClick = click.pipe(
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52 | * throttleTime(400, asyncScheduler, throttleConfig)
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53 | * );
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54 | *
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55 | * doubleClick.subscribe((throttleValue: Event) => {
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56 | * console.log(`Double-clicked! Timestamp: ${throttleValue.timeStamp}`);
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57 | * });
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58 | * ```
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59 | *
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60 | * If you enable the `leading` parameter in this example, the output would be the primary click and
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61 | * the double click, but restricts additional clicks within 400ms.
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62 | *
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63 | * @see {@link auditTime}
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64 | * @see {@link debounceTime}
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65 | * @see {@link delay}
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66 | * @see {@link sampleTime}
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67 | * @see {@link throttle}
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68 | *
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69 | * @param duration Time to wait before emitting another value after
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70 | * emitting the last value, measured in milliseconds or the time unit determined
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71 | * internally by the optional `scheduler`.
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72 | * @param scheduler The {@link SchedulerLike} to use for
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73 | * managing the timers that handle the throttling. Defaults to {@link asyncScheduler}.
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74 | * @param config a configuration object to define `leading` and
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75 | * `trailing` behavior. Defaults to `{ leading: true, trailing: false }`.
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76 | * @return A function that returns an Observable that performs the throttle
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77 | * operation to limit the rate of emissions from the source.
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78 | */
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79 | export declare function throttleTime<T>(duration: number, scheduler?: SchedulerLike, config?: import("./throttle").ThrottleConfig): MonoTypeOperatorFunction<T>;
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80 | //# sourceMappingURL=throttleTime.d.ts.map |
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