stromjs/dist/functions/merge.js

Dependency-free streams utils for Node.js

"use strict";
exports.__esModule = true;
exports.merge = void 0;
var stream_1 = require("stream");
function merge() {
    var streams = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        streams[_i] = arguments[_i];
    }
    var isStarted = false;
    var streamEndedCount = 0;
    return new stream_1.Readable({
        objectMode: true,
        read: function () {
            var _this = this;
            if (streamEndedCount >= streams.length) {
                this.push(null);
            }
            else if (!isStarted) {
                isStarted = true;
                streams.forEach(function (stream) {
                    return stream
                        .on("data", function (chunk) {
                        if (!_this.push(chunk)) {
                            streams.forEach(function (s) { return s.pause(); });
                        }
                    })
                        .on("error", function (err) { return _this.emit("error", err); })
                        .on("end", function () {
                        streamEndedCount++;
                        if (streamEndedCount === streams.length) {
                            _this.push(null);
                        }
                    });
                });
            }
            else {
                streams.forEach(function (s) { return s.resume(); });
            }
        }
    });
}
exports.merge = merge;