@parcel/utils/src/shared-buffer.js

Blazing fast, zero configuration web application bundler

// @flow
/* global MessageChannel:readonly */

export let SharedBuffer: Class<ArrayBuffer> | Class<SharedArrayBuffer>;

// $FlowFixMe[prop-missing]
if (process.browser) {
  SharedBuffer = ArrayBuffer;
  // Safari has removed the constructor
  if (typeof SharedArrayBuffer !== 'undefined') {
    let channel = new MessageChannel();
    try {
      // Firefox might throw when sending the Buffer over a MessagePort
      channel.port1.postMessage(new SharedArrayBuffer(0));
      SharedBuffer = SharedArrayBuffer;
    } catch (_) {
      // NOOP
    }
    channel.port1.close();
    channel.port2.close();
  }
} else {
  SharedBuffer = SharedArrayBuffer;
}