@tianfeng98/hls.js/src/utils/mediasource-helper.ts

HLS.js is a JavaScript library that supports playing MPEG-TS and HEVC encoded HLS streams in browsers with support for MSE.

/**
 * MediaSource helper
 */

export function getMediaSource(
  preferManagedMediaSource = true,
): typeof MediaSource | undefined {
  if (typeof self === 'undefined') return undefined;
  const mms =
    (preferManagedMediaSource || !self.MediaSource) &&
    ((self as any).ManagedMediaSource as undefined | typeof MediaSource);
  return (
    mms ||
    self.MediaSource ||
    ((self as any).WebKitMediaSource as typeof MediaSource)
  );
}