Electron and React: Alert - Exceeded MaxListenersWarning: Potential memory leak detected in EventEmitter. [EventEmitter] has 21 updateDeviceList listeners added to it

Question

Electron and React: Alert - Exceeded MaxListenersWarning: Potential memory leak detected in EventEmitter. [EventEmitter] has 21 updateDeviceList listeners added to it

I've been tirelessly searching to understand the root cause of this issue, and I believe I'm getting closer to unraveling the mystery. My method involves using USB detection to track the connection of USB devices:

usbDetect.on('add', () => sendDeviceListToGUI(1));

Within this function, I perform the following actions:

const sendDeviceListToGUI= async (status: number) => {
  mainWindow?.webContents.send('updatingDeviceList', status);
  const list = await getConnectedDeviceArray();
  mainWindow?.webContents.send('updateDeviceList', list);
};

I suspect that the events may be stacking up every time a device is connected or disconnected:

(node:41276) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 21 updateDeviceList listeners added to [EventEmitter]. Use emitter.setMaxListeners() to increase limit
(Use `TestApp --trace-warnings ...` to show where the warning was created)
(node:41276) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 21 updatingDeviceList listeners added to [EventEmitter]. Use emitter.setMaxListeners() to increase limit

I attempted to raise the limit without success, leading me to believe that resolving the event with promises might be the solution. Any insights on why '--trace-warnings ...' isn't working would be greatly appreciated.

javascript node.js reactjs typescript electron

Answer 1

Answer №1

After investigating, I discovered the issue in my react file. Due to using functional components, every time the component is re-rendered, a new listener is registered.

window.myapiAPI.updateDeviceList()

I believe there may be a solution using hooks to ensure the hook only runs once. For now, in my preload file, I remove all listeners before adding a new one.

ipcRenderer.removeAllListeners('updateDeviceList');

UPDATE 2

To address this issue, I encapsulated all functions within a useEffect hook that executes on the initial render.

useEffect(() => {
    window.myAPI.message((message: string) => {
      AppToaster.show({
        message,
        intent: Intent.WARNING,
      });
    });
  }, []);

Answer 2

After investigating, I discovered the issue in my react file. Due to using functional components, every time the component is re-rendered, a new listener is registered.

window.myapiAPI.updateDeviceList()

I believe there may be a solution using hooks to ensure the hook only runs once. For now, in my preload file, I remove all listeners before adding a new one.

ipcRenderer.removeAllListeners('updateDeviceList');

UPDATE 2

To address this issue, I encapsulated all functions within a useEffect hook that executes on the initial render.

useEffect(() => {
    window.myAPI.message((message: string) => {
      AppToaster.show({
        message,
        intent: Intent.WARNING,
      });
    });
  }, []);

Answer 3

Answer №2

To register the IPC listener without dependencies and only run it when mounting, utilize an useEffect hook. You can use the useEffect cleanup function to remove the listener upon unmounting the component, following Hồng Phúc's suggestion.

Here's an example:

useEffect(() => {
  window.myAPI.message((message: string) => {
    AppToaster.show({
      message,
      intent: Intent.WARNING
    });
  });
  return function cleanup() {
    ipcRenderer.removeAllListeners('updateDeviceList');
  }
}, []);

Answer 4

To register the IPC listener without dependencies and only run it when mounting, utilize an useEffect hook. You can use the useEffect cleanup function to remove the listener upon unmounting the component, following Hồng Phúc's suggestion.

Here's an example:

useEffect(() => {
  window.myAPI.message((message: string) => {
    AppToaster.show({
      message,
      intent: Intent.WARNING
    });
  });
  return function cleanup() {
    ipcRenderer.removeAllListeners('updateDeviceList');
  }
}, []);

Answer 5

Answer №3

When the "Max listeners exceeded Warning" error message pops up, it's a sign that your app is about to slow down significantly. Trying to use setMaxListeners() to fix this issue will only result in temporary relief, as the error will most likely persist.

To tackle this problem effectively, it's best to minimize the frequency of event emitter usage to no more than 10 times. This not only enhances code readability but also boosts overall performance.

In electron, opt for the send() method instead of emit(), which is commonly used in frameworks like expressjs and nextjs in Node.js. Keep an eye on how often this method is being utilized to prevent further issues.

Answer 6

When the "Max listeners exceeded Warning" error message pops up, it's a sign that your app is about to slow down significantly. Trying to use setMaxListeners() to fix this issue will only result in temporary relief, as the error will most likely persist.

To tackle this problem effectively, it's best to minimize the frequency of event emitter usage to no more than 10 times. This not only enhances code readability but also boosts overall performance.

In electron, opt for the send() method instead of emit(), which is commonly used in frameworks like expressjs and nextjs in Node.js. Keep an eye on how often this method is being utilized to prevent further issues.

Electron and React: Alert - Exceeded MaxListenersWarning: Potential memory leak detected in EventEmitter. [EventEmitter] has 21 updateDeviceList listeners added to it

Answer №1

UPDATE 2

Answer №2

Answer №3

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