Function update_prop

packages/svelte/src/internal/client/reactivity/props.js:32–36

(fn, d = 1)

 * @returns {number}
 */
export function update_prop(fn, d = 1) {
	const value = fn();
	fn(value + d);
	return value;
}

/**
 * @param {((value?: number) => number)} fn