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

Standard library for Node.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const stream_1 = require("stream");
/**
 * Like `transformMap`, but lightweight, no concurrency, etc.
 * Inspired by `through2`
 */
function transformThrough(mapper, opt = {}) {
    let index = 0;
    return new stream_1.Transform({
        objectMode: true,
        ...opt,
        async transform(chunk, _encoding, cb) {
            try {
                const res = await mapper(chunk, index++);
                cb(null, res);
            }
            catch (err) {
                console.error(err); // to be sure
                cb(err);
            }
        },
    });
}
exports.transformThrough = transformThrough;
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