streams/operators/sync/tee.js

A lazy streams library for functional composition in JavaScript.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const iterator_stream_1 = require("../../iterator-stream");
iterator_stream_1.IteratorStream.prototype.tee = function () {
    // eslint-disable-next-line @typescript-eslint/no-this-alias
    const self = this;
    const buffers = new Set();
    function next() {
        const buffer = [];
        buffers.add(buffer);
        function* tee() {
            try {
                while (true) {
                    if (buffer.length === 0) {
                        const next = self.next();
                        buffers.forEach((buffer) => buffer.push(next));
                    }
                    const item = buffer.shift();
                    if (item.done) {
                        return item.value;
                    }
                    yield item.value;
                }
            }
            finally {
                buffers.delete(buffer);
                if (buffers.size === 0) {
                    self.return?.();
                }
            }
        }
        return { value: new iterator_stream_1.IteratorStream(tee()) };
    }
    function* iteratorTee() {
        yield* { [Symbol.iterator]: () => ({ next }) };
    }
    return iteratorTee();
};
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