Method of

packages/svelte/src/motion/tweened.js:220–228

* Create a tween whose value is bound to the return value of `fn`. This must be called * inside an effect root (for example, during component initialisation). * * ```svelte * * import { Tween } from 'svelte/motion'; * * let { number } = $props(); * * const tween = Tween

(fn, options)

	 * @param {TweenOptions<U>} [options]
	 */
	static of(fn, options) {
		const tween = new Tween(fn(), options);

		render_effect(() => {
			tween.set(fn());
		});

		return tween;
	}

	/**
	 * Sets `tween.target` to `value` and returns a `Promise` that resolves if and when `tween.current` catches up to it.