Excessive number of pending callbacks: 501. some pending callbacks that might have leaked by never being called from native code

Excessive Number of Pending Callbacks: 501

An excessive number of pending callbacks usually occurs when there is a large number of asynchronous tasks or callbacks waiting to be executed in your code. This can be problematic, as it may lead to performance issues or memory leaks if these callbacks are not properly handled and released.

When a callback is created in native code but never called or properly released, it is considered a leaking callback. Leaking callbacks can accumulate over time and result in the “excessive number of pending callbacks” warning or error messages.

To fix this issue, you need to ensure that all your callbacks are properly handled and released when they are no longer needed. Here is an example of how you can manage and clean up callbacks:

      
// Example code demonstrating callback management

// Create an object to hold your callbacks
var callbackHolder = {};

// Function to add a callback to the holder
function addCallback(callbackName, callback) {
  callbackHolder[callbackName] = callback;
}

// Function to execute and release a specific callback
function executeCallback(callbackName) {
  if (callbackHolder.hasOwnProperty(callbackName)) {
    var callback = callbackHolder[callbackName];
    delete callbackHolder[callbackName];
    callback(); //  calling the callback function
  }
}

// Usage example
function myAsyncFunction() {
  // Simulating an asynchronous task
  setTimeout(function() {
    console.log("Async task completed!");
    executeCallback("myAsyncCallback"); // releasing the callback
  }, 1000);
}

// Adding a callback to the holder
addCallback("myAsyncCallback", function() {
  console.log("Callback executed!");
});
      
    

In this example, we create an object (callbackHolder) to store our callbacks. The addCallback function adds a callback to the holder using a unique name. When the asynchronous task is completed, we call the executeCallback function, passing the callback name as an argument. This function then checks if the callback exists in the holder, deletes it from the holder, and finally executes the callback.

By following this approach, you can ensure that all your callbacks are properly managed and released, thus avoiding an excessive number of pending callbacks and potential memory leaks.