| 1 | import { Operator, Stream } from '../index';
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| 2 | export declare class DropRepeatsOperator<T> implements Operator<T, T> {
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| 3 | ins: Stream<T>;
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| 4 | type: string;
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| 5 | out: Stream<T>;
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| 6 | isEq: (x: T, y: T) => boolean;
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| 7 | private v;
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| 8 | constructor(ins: Stream<T>, fn: ((x: T, y: T) => boolean) | undefined);
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| 9 | _start(out: Stream<T>): void;
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| 10 | _stop(): void;
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| 11 | _n(t: T): void;
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| 12 | _e(err: any): void;
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| 13 | _c(): void;
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| 14 | }
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| 15 | /**
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| 16 | * Drops consecutive duplicate values in a stream.
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| 17 | *
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| 18 | * Marble diagram:
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| 19 | *
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| 20 | * ```text
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| 21 | * --1--2--1--1--1--2--3--4--3--3|
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| 22 | * dropRepeats
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| 23 | * --1--2--1--------2--3--4--3---|
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| 24 | * ```
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| 25 | *
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| 26 | * Example:
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| 27 | *
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| 28 | * ```js
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| 29 | * import dropRepeats from 'xstream/extra/dropRepeats'
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| 30 | *
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| 31 | * const stream = xs.of(1, 2, 1, 1, 1, 2, 3, 4, 3, 3)
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| 32 | * .compose(dropRepeats())
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| 33 | *
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| 34 | * stream.addListener({
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| 35 | * next: i => console.log(i),
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| 36 | * error: err => console.error(err),
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| 37 | * complete: () => console.log('completed')
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| 38 | * })
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| 39 | * ```
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| 40 | *
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| 41 | * ```text
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| 42 | * > 1
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| 43 | * > 2
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| 44 | * > 1
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| 45 | * > 2
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| 46 | * > 3
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| 47 | * > 4
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| 48 | * > 3
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| 49 | * > completed
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| 50 | * ```
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| 51 | *
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| 52 | * Example with a custom isEqual function:
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| 53 | *
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| 54 | * ```js
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| 55 | * import dropRepeats from 'xstream/extra/dropRepeats'
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| 56 | *
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| 57 | * const stream = xs.of('a', 'b', 'a', 'A', 'B', 'b')
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| 58 | * .compose(dropRepeats((x, y) => x.toLowerCase() === y.toLowerCase()))
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| 59 | *
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| 60 | * stream.addListener({
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| 61 | * next: i => console.log(i),
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| 62 | * error: err => console.error(err),
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| 63 | * complete: () => console.log('completed')
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| 64 | * })
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| 65 | * ```
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| 66 | *
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| 67 | * ```text
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| 68 | * > a
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| 69 | * > b
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| 70 | * > a
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| 71 | * > B
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| 72 | * > completed
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| 73 | * ```
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| 74 | *
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| 75 | * @param {Function} isEqual An optional function of type
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| 76 | * `(x: T, y: T) => boolean` that takes an event from the input stream and
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| 77 | * checks if it is equal to previous event, by returning a boolean.
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| 78 | * @return {Stream}
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| 79 | */
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| 80 | export default function dropRepeats<T>(isEqual?: ((x: T, y: T) => boolean) | undefined): (ins: Stream<T>) => Stream<T>;
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