Function extractType

packages/browser/src/eventbuilder.ts:182–194

(ex: Error & { message: { error?: Error } })

 * Usually, this is the `name` property on Error objects but WASM errors need to be treated differently.
 */
export function extractType(ex: Error & { message: { error?: Error } }): string | undefined {
  const name = ex?.name;

  // The name for WebAssembly.Exception Errors needs to be extracted differently.
  // Context: https://github.com/getsentry/sentry-javascript/issues/13787
  if (!name && isWebAssemblyException(ex)) {
    // Emscripten sets array[type, message] to the "message" property on the WebAssembly.Exception object
    const hasTypeInMessage = ex.message && Array.isArray(ex.message) && ex.message.length == 2;
    return hasTypeInMessage ? ex.message[0] : 'WebAssembly.Exception';
  }

  return name;
}

/**
 * There are cases where stacktrace.message is an Event object