upstream/emscripten/test/pthread/call_async_on_main_thread.js

addToLibrary({
  // Test asynchronously calling a function on the main thread.
  report_result__proxy: 'async',
  report_result__sig: 'viii',
  report_result: function(param1, param2, param3) {
    if (typeof ENVIRONMENT_IS_WORKER !== 'undefined' && ENVIRONMENT_IS_WORKER) {
      console.error('This function should be getting called on the main thread!');
    }
    console.log(`got ${param1} ${param2} ${param3}`);
    reportResultToServer(param1 + param2 * param3);
  }
});