Function unlink

src/system.ts:93–116

(link: Link, sub = link.sub)

	}

	function unlink(link: Link, sub = link.sub): Link | undefined {
		const { dep, prevDep, nextDep, nextSub, prevSub } = link;
		if (nextDep !== undefined) {
			nextDep.prevDep = prevDep;
		} else {
			sub.depsTail = prevDep;
		}
		if (prevDep !== undefined) {
			prevDep.nextDep = nextDep;
		} else {
			sub.deps = nextDep;
		}
		if (nextSub !== undefined) {
			nextSub.prevSub = prevSub;
		} else {
			dep.subsTail = prevSub;
		}
		if (prevSub !== undefined) {
			prevSub.nextSub = nextSub;
		} else if ((dep.subs = nextSub) === undefined) {
			unwatched(dep);
		}
		return nextDep;
	}

	function propagate(link: Link, innerWrite: boolean): void {
		let next = link.nextSub;