Function isValidLink

src/system.ts:252–261

(checkLink: Link, sub: ReactiveNode)

	}

	function isValidLink(checkLink: Link, sub: ReactiveNode): boolean {
		let link = sub.depsTail;
		while (link !== undefined) {
			if (link === checkLink) {
				return true;
			}
			link = link.prevDep;
		}
		return false;
	}
}