@electric-sql/d2mini/dist/operators/filterBy.js

D2Mini is a minimal implementation of Differential Dataflow for performing in-memory incremental view maintenance.

import { map } from './map.js';
import { innerJoin } from './join.js';
import { consolidate } from './consolidate.js';
/**
 * Filters the elements of a keyed stream, by keys of another stream.
 * This allows you to build pipelies where you have multiple outputs that are related,
 * such as a streams of issues and comments for a project.
 *
 * @param other - The other stream to filter by, which must have the same key type as the input stream
 */
export function filterBy(other) {
    return (stream) => {
        const otherKeys = other.pipe(map(([key, _]) => [key, null]));
        return stream.pipe(innerJoin(otherKeys), map(([key, [value, _]]) => [key, value]), consolidate());
    };
}
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