function handleMessage()

in packages/relay-devtools-core/src/backend.js [143:172]

• 27 lines of code
• 5 McCabe index (conditional complexity)

  function handleMessage(event) {
    let data;
    try {
      if (typeof event.data === 'string') {
        data = JSON.parse(event.data);
        if (__DEBUG__) {
          debug('WebSocket.onmessage', data);
        }
      } else {
        throw Error();
      }
    } catch (e) {
      console.error(
        '[Relay DevTools] Failed to parse JSON: ' + String(event.data)
      );
      return;
    }
    messageListeners.forEach(fn => {
      try {
        fn(data);
      } catch (error) {
        // jsc doesn't play so well with tracebacks that go into eval'd code,
        // so the stack trace here will stop at the `eval()` call. Getting the
        // message that caused the error is the best we can do for now.
        console.log('[Relay DevTools] Error calling listener', data);
        console.log('error:', error);
        throw error;
      }
    });
  }