@surface/custom-element/internal/aot/observe.js

Provides support of directives and data binding on custom elements.

import { getValue } from "@surface/core";
import AsyncObserver from "../reactivity/async-observer.js";
import { scheduler } from "../singletons.js";
export default function observe(target, observables, listener, lazy = false) {
    const subscriptions = [];
    for (const path of observables) {
        const observer = AsyncObserver.observe(target, path, scheduler);
        subscriptions.push(observer.subscribe(listener));
        if (!lazy) {
            listener(getValue(target, ...path));
        }
    }
    return { unsubscribe: () => subscriptions.splice(0).forEach(x => x.unsubscribe()) };
}