Function applyRef

src/diff/index.js:617–636

(ref, value, vnode)

 * @param {VNode} vnode
 */
export function applyRef(ref, value, vnode) {
	try {
		if (typeof ref == 'function') {
			let hasRefUnmount = typeof ref._unmount == 'function';
			if (hasRefUnmount) {
				// @ts-ignore TS doesn't like moving narrowing checks into variables
				ref._unmount();
			}

			if (!hasRefUnmount || value != NULL) {
				// Store the cleanup function on the function
				// instance object itself to avoid shape
				// transitioning vnode
				ref._unmount = ref(value);
			}
		} else ref.current = value;
	} catch (e) {
		options._catchError(e, vnode);
	}
}

/**
 * Unmount a virtual node from the tree and apply DOM changes