@johngw/stream/dist/common/transformers/withCounter.cjs

Reactive programming tools using the WHATWG Streams API.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.withCounter = void 0;
const map_1 = require("@johngw/stream/transformers/map");
/**
 * 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}-|
 * ```
 */
function withCounter(start = 0) {
    let counter = start;
    return (0, map_1.map)((chunk) => ({
        chunk,
        counter: counter++,
    }));
}
exports.withCounter = withCounter;
//# sourceMappingURL=withCounter.js.map