listening only to one event at a time in chrome extension background script

Question

i want the init() function to be called only one time even if the two events were triggered

chrome.tabs.onUpdated.addListener(function callback() {
  init();
});
chrome.tabs.onActivated.addListener(function callback() {
  init();
});

Answer 1

Use a named function for both events and unregister both events inside.

chrome.tabs.onUpdated.addListener(initOnce);
chrome.tabs.onActivated.addListener(initOnce);

function initOnce() {
  chrome.tabs.onUpdated.removeListener(initOnce);
  chrome.tabs.onActivated.removeListener(initOnce);
  init();
}

Answer 2

You can track it with a variable.

let initCalled = false;

Then in your init() function:

function init() {
    if (initCalled) return;
    //rest of init() code here
}