I want to ad an eventListener for window resize inside my custom lightning web component but I don't know how to do it

Maybe something like this?

    window.addEventListener('resize', this.handleResize());
    //custom code

you need to pass the function by reference and not invoke it directly while declaration. Later it will be invoked when the event is triggered. PFB:

connectedCallback() {
    window.addEventListener('resize', this.myFunction);
@track count = 0;
myFunction = () => {
    this.count = this.count += 1;
    console.log('resized => ', this.count);

Here is the playground link

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