How to use the @lwc/wire-service.register function in @lwc/wire-service

wiredEventTargets.forEach(wiredEventTarget => wiredEventTarget.dispatchEvent(new ValueChangedEvent({ data: undefined, error: err })));
        }
    };

    const getLastConfig = () => {
        return lastConfig;
    };

    const add = (arr, item) => {
        const idx = arr.indexOf(item);
        if (idx === -1) {
            arr.push(item);
        }
    };

    register(adapterId, (wiredEventTarget) => {
        done = false;
        add(wiredEventTargets, wiredEventTarget);
        wiredEventTarget.dispatchEvent(new ValueChangedEvent({ data: undefined, error: undefined }));

        wiredEventTarget.addEventListener('connect', () => {
            done = false;
            lastConfig = {};
            add(wiredEventTargets, wiredEventTarget);
        });

        wiredEventTarget.addEventListener('disconnect', () => {
            done = true;
            lastConfig = undefined;
            const idx = wiredEventTargets.indexOf(wiredEventTarget);
            if (idx > -1) {
                wiredEventTargets.splice(idx, 1);

import { register, ValueChangedEvent } from '@lwc/wire-service';

export function connectStore(store) {
    return store.getState();
}

register(connectStore, eventTarget => {
    let store;
    let subscription;

    const notifyStateChange = () => {
        const state = store.getState();
        eventTarget.dispatchEvent(new ValueChangedEvent(state));
    };

    eventTarget.addEventListener('connect', () => {
        subscription = store.subscribe(notifyStateChange);
        notifyStateChange();
    });

    eventTarget.addEventListener('disconnect', () => {
        if (subscription) {
            subscription();