Function teardown

packages/svelte/src/internal/client/reactivity/effects.js:192–197

(fn)

 * @param {() => void} fn
 */
export function teardown(fn) {
	const effect = create_effect(RENDER_EFFECT, null);
	set_signal_status(effect, CLEAN);
	effect.teardown = fn;
	return effect;
}

/**
 * Internal representation of `$effect(...)`