trying to make race/all combinators for AbortController signals that aren't leaky

1.js

class cancelToken {
	constructor(controller = new AbortController()) {
		this.controller = controller;
		this.signal = controller.signal;
		({
			pr: this.signal.pr,
			rej: this.rej,
		} = signalPromise(this.signal));
		this.signal.pr.catch(() => {
			this.controller.abort();
			this.rej = this.signal = this.signal.pr = this.controller = null;
		});
	}
	
	abort() {
		this.rej();
	}
}

function signalPromise(signal) {
	if (signal.pr) {
		return {
			pr: signal.pr,
		};
	}
	var ret = {};
	ret.pr = new Promise((res,rej) => {
		signal.addEventListener("abort",rej,false);
		ret.rej = rej;
	});
	ret.pr.cleanup = () => {
		if (signal) {
			signal.removeEventListener("abort",ret.rej,false);
			signal = null;
		}
		if (ret) {
			ret = ret.pr = ret.pr.cleanup = ret.rej = null;
		}
	};
	ret.pr.catch(ret.pr.cleanup);
	return ret;
}

function signalRace(signals) {
	var token = new cancelToken();
	var prs = signals.map(signal => signalPromise(signal).pr);
	var cleanups = prs.map(pr => pr.cleanup);
	Promise.race(prs).catch(() => {
		if (token) {
			token.abort();
			token = null;
		}
		if (cleanups) {
			cleanups.forEach(fn => fn());
			cleanups = null;
		}
	});
	prs = null;
	return token.signal;
}

function signalAll(signals) {
	var token = new cancelToken();
	var prs = signals.map(signal => signalPromise(signal).pr);
	var cleanups = prs.map(pr => pr.cleanup);
	Promise.all(
		prs.map(pr => pr.catch(e => e))
	).then(() => {
		if (token) {
			token.abort();
			token = null;
		}
		if (cleanups) {
			cleanups.forEach(fn => fn());
			cleanups = null;
		}
	});
	prs = null;
	return token.signal;
}

2.js

var a = new cancelToken();
var b = new AbortController();
var c = new AbortController();
var d = new AbortController();
var e = signalAll([a.signal,b.signal,c.signal,d.signal]);

e.pr.catch(() => { console.log("aborted!"); });

c.abort();
a.abort();
b.abort();
d.abort();
// aborted!

3.js

var a = new cancelToken();
var b = new AbortController();
var c = new AbortController();
var d = new AbortController();
var e = signalAll([a.signal,b.signal,c.signal,d.signal]);

e.pr.catch(() => { console.log("aborted!"); });

b.abort();
// aborted!