A class of readable streams that vend data chunks generated by a media recorder

MediaRecorderDataStream.js

export default class MediaRecorderDataStream extends ReadableStream {
	constructor(recorder) {
		const signaler = new AbortController(), { signal } = signaler;
		super({
			start: controller => {
				recorder.addEventListener("dataavailable", ev => {
					controller.enqueue(ev.data);
				}, { signal });
				recorder.addEventListener("stop", ev => { 
					controller.close();
					signaler.abort();
				}, { once: true, signal });
			},
			cancel: () => {
				signaler.abort();
			}
		}, { highWaterMark: 0, size: data => data.size });
	}
}