@dvcol/svelte-utils/dist/resize.action.js

Svelte library for common utility functions and constants

const callbacks = new WeakMap();
let observer;
export const resize = (target, parameters) => {
    if (!observer) {
        observer = new ResizeObserver(entries => entries.forEach((entry, i) => {
            const callback = callbacks.get(entry.target);
            callback?.(entry, i, entries);
        }));
    }
    function destroy() {
        observer.unobserve(target);
        callbacks.delete(target);
    }
    function update(options) {
        destroy();
        const cb = typeof options === 'function' ? options : options.callback;
        const opt = typeof options === 'function' ? undefined : options.options;
        callbacks.set(target, cb);
        observer.observe(target, opt);
    }
    update(parameters);
    return {
        destroy,
        update,
    };
};