@naturalcycles/nodejs-lib/dist/stream/readable/readableFromArray.js

Standard library for Node.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.readableFromArray = void 0;
const stream_1 = require("stream");
const js_lib_1 = require("@naturalcycles/js-lib");
/**
 * Create Readable from Array.
 * Supports a `mapper` function (async) that you can use to e.g create a timer-emitting-readable.
 *
 * For simple cases use Readable.from(...) (Node.js 12+)
 */
function readableFromArray(items, mapper = js_lib_1._passthroughMapper, opt) {
    let i = -1;
    return new stream_1.Readable({
        objectMode: true,
        ...opt,
        async read() {
            i++;
            if (i < items.length) {
                try {
                    this.push(await mapper(items[i], i));
                }
                catch (err) {
                    console.error(err);
                    this.destroy(err);
                }
            }
            else {
                this.push(null); // end
            }
        },
    });
}
exports.readableFromArray = readableFromArray;