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- 'use strict';
- var Writable = require('flush-write-stream');
- function listenerCount(stream, evt) {
- return stream.listeners(evt).length;
- }
- function hasListeners(stream) {
- return !!(listenerCount(stream, 'readable') || listenerCount(stream, 'data'));
- }
- function sinker(file, enc, callback) {
- callback();
- }
- function sink(stream) {
- var sinkAdded = false;
- var sinkOptions = {
- objectMode: stream._readableState.objectMode,
- };
- var sinkStream = new Writable(sinkOptions, sinker);
- function addSink() {
- if (sinkAdded) {
- return;
- }
- if (hasListeners(stream)) {
- return;
- }
- sinkAdded = true;
- stream.pipe(sinkStream);
- }
- function removeSink(evt) {
- if (evt !== 'readable' && evt !== 'data') {
- return;
- }
- if (hasListeners(stream)) {
- sinkAdded = false;
- stream.unpipe(sinkStream);
- }
- }
- stream.on('newListener', removeSink);
- stream.on('removeListener', removeSink);
- stream.on('removeListener', addSink);
-
-
- process.nextTick(addSink);
- return stream;
- }
- module.exports = sink;
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