@naturalcycles/nodejs-lib/dist/stream/transform/transformFlatten.js

Standard library for Node.js

import { Transform } from 'node:stream';
export function transformFlatten() {
    return new Transform({
        objectMode: true,
        highWaterMark: 1,
        transform(chunk, _, cb) {
            for (const item of chunk) {
                this.push(item);
            }
            cb(); // acknowledge
        },
    });
}
export function transformFlattenIfNeeded() {
    return new Transform({
        objectMode: true,
        highWaterMark: 1,
        transform(chunk, _, cb) {
            if (Array.isArray(chunk)) {
                for (const item of chunk) {
                    this.push(item);
                }
            }
            else {
                // As a safety precaution, to not crash the pipeline - push as is
                this.push(chunk);
            }
            cb(); // acknowledge
        },
    });
}