addEventListener

Registers an event listener in the global scope, which will be called synchronously whenever the event type is dispatched.

addEventListener('unload', () => { console.log('All finished!'); });
...
dispatchEvent(new Event('unload'));
function addEventListener(
type: string,
options?: boolean | AddEventListenerOptions | undefined,
): void;
§
addEventListener(type: string, callback: EventListenerOrEventListenerObject | null, options?: boolean | AddEventListenerOptions | undefined): void
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§Parameters

§
type: string
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§
options?: boolean | AddEventListenerOptions | undefined optional
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§Return Type