@grail-ui/svelte/dist/eventListener/eventListener.js

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/**
 * Adds an event listener to an element, and returns a function to remove it.
 */
export function addEventListener(target, event, handler, options) {
    const events = Array.isArray(event) ? [...event] : [event];
    events.forEach((_event) => target.addEventListener(_event, handler, options));
    return () => {
        events.forEach((_event) => target.removeEventListener(_event, handler, options));
    };
}