@river-build/sdk/dist/observable/observable.js

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export class Observable {
    _nextId = 0;
    subscribers = [];
    _value;
    constructor(value) {
        this._value = value;
    }
    get value() {
        return this._value;
    }
    setValue(newValue) {
        this._value = newValue;
        this.notify();
    }
    subscribe(subscriber, opts = {}) {
        const sub = {
            id: this._nextId++,
            fn: subscriber,
            once: opts?.once ?? false,
            condition: opts?.condition ?? (() => true),
        };
        this.subscribers.push(sub);
        if (opts.fireImediately) {
            this._notify(sub, this.value);
        }
        return () => this.unsubscribe(subscriber);
    }
    when(condition, opts = { timeoutMs: 5000 }) {
        const logId = opts.description ? ` ${opts.description}` : '';
        const timeoutError = new Error(`Timeout waiting for condition${logId}`);
        return new Promise((resolve, reject) => {
            const timeoutHandle = setTimeout(() => {
                reject(timeoutError);
            }, opts.timeoutMs);
            this.subscribe((value) => {
                clearTimeout(timeoutHandle);
                resolve(value);
            }, { fireImediately: true, condition: condition, once: true });
        });
    }
    unsubscribe(subscriber) {
        this.subscribers = this.subscribers.filter((sub) => sub.fn !== subscriber);
    }
    notify() {
        const subscriptions = this.subscribers;
        subscriptions.forEach((sub) => this._notify(sub, this.value));
    }
    _notify(sub, value) {
        if (sub.condition(value)) {
            sub.fn(value);
            if (sub.once) {
                this.subscribers = this.subscribers.filter((s) => s !== sub);
            }
        }
    }
}
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