What is delayed-stream?
The delayed-stream package is a Node.js module that allows you to buffer a stream and release it only when you decide to. This can be useful when you need to collect data from a stream before processing it, or when you want to ensure that a stream's data is only consumed after a certain event or condition is met.
What are delayed-stream's main functionalities?
Create a delayed stream
This feature allows you to create a delayed stream from an existing readable stream. The data from the original stream is buffered until you decide to release it, for example, using a timeout as shown in the code sample.
const DelayedStream = require('delayed-stream');
const fs = require('fs');
const source = fs.createReadStream('source.txt');
const delayed = DelayedStream.create(source);
// You can now wire up event listeners
source.on('data', function(data) {
console.log('Received data: ' + data);
});
// And later, release the buffered data
setTimeout(function() {
delayed.pipe(process.stdout);
}, 5000);
Other packages similar to delayed-stream
through2
Through2 is a tiny wrapper around Node streams.Transform that makes it easier to create transform streams. It is similar to delayed-stream in that it allows you to manipulate stream data, but it focuses more on transforming data rather than delaying it.
concat-stream
Concat-stream is a writable stream that concatenates all the data from a stream and calls a callback with the result. It is similar to delayed-stream in that it collects all the data from a stream before processing, but it does not provide the same level of control over when the data is released.
pause-stream
Pause-stream allows you to pause a readable/writable stream at any time and then resume it later. It is similar to delayed-stream in that it lets you control the flow of data in a stream, but it is more about pausing and resuming rather than buffering and releasing.