How to use the comlink.proxyValue function in comlink

public onUnload(lambda: Lambda) {
        this.subscribers.onUnload.push(lambda)
        return Comlink.proxyValue(() => pull(this.subscribers.onUnload, lambda))
    }

public async getOutlineShellProxy() {
        if (this.outlineShell) return Comlink.proxyValue(this.outlineShell)
        return null
    }

public onUpdate(lambda: Lambda) {
        this.subscribers.onUpdate.push(lambda)
        return Comlink.proxyValue(() => pull(this.subscribers.onUpdate, lambda))
    }

public onChange(subscriber: OutlineChangeSubscriber) {
        this.subscribers.push(subscriber)
        return Comlink.proxyValue(() => pull(this.subscribers, subscriber))
    }

public onLoad(lambda: Lambda) {
        this.subscribers.onLoad.push(lambda)
        if (this.outline) {
            this.invokeSubscribers("onLoad")
        }
        return Comlink.proxyValue(() => pull(this.subscribers.onLoad, lambda))
    }

public async getOutlineVisitState() {
        if (this.outlineVisitState) return Comlink.proxyValue(this.outlineVisitState)
        return null
    }