@johngw/stream/dist/transformers/withCounter.js

Reactive programming tools using the WHATWG Streams API.

import { map } from './map.js';
/**
 * Adds a counter representing the amount of chunks
 * received thus far.
 *
 * @group Transformers
 * @example
 * ```
 * --a----------------------b-------|
 *
 * withCounter()
 *
 * --{chunk:'a',counter:0}--{chunk:'b',counter:1}-|
 * ```
 */
export function withCounter(start = 0) {
    let counter = start;
    return map((chunk) => ({
        chunk,
        counter: counter++,
    }));
}
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