Method set

packages/svelte/src/motion/tweened.js:238–292

* Sets `tween.target` to `value` and returns a `Promise` that resolves if and when `tween.current` catches up to it. * * If `options` are provided, they will override the tween's defaults. * @param {T} value * @param {TweenOptions } [options] * @returns

(value, options)

	 * @returns
	 */
	set(value, options) {
		set(this.#target, value);

		let {
			delay = 0,
			duration = 400,
			easing = linear,
			interpolate = get_interpolator
		} = { ...this.#defaults, ...options };

		if (duration === 0) {
			this.#task?.abort();
			set(this.#current, value);
			return Promise.resolve();
		}

		const start = raf.now() + delay;

		/** @type {(t: number) => T} */
		let fn;
		let started = false;
		let previous_task = this.#task;

		this.#task = loop((now) => {
			if (now < start) {
				return true;
			}

			if (!started) {
				started = true;

				const prev = this.#current.v;

				fn = interpolate(prev, value);

				if (typeof duration === 'function') {
					duration = duration(prev, value);
				}

				previous_task?.abort();
			}

			const elapsed = now - start;

			if (elapsed > /** @type {number} */ (duration)) {
				set(this.#current, value);
				return false;
			}

			set(this.#current, fn(easing(elapsed / /** @type {number} */ (duration))));
			return true;
		});

		return this.#task.promise;
	}

	get current() {
		return get(this.#current);