react-obsidian/dist/src/observable/Observable.js

Dependency injection framework for React and React Native applications

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Observable = void 0;
class Observable {
    constructor(initialValue) {
        this.subscribers = new Set();
        this.currentValue = initialValue;
    }
    get value() {
        return this.currentValue;
    }
    set value(value) {
        this.currentValue = value;
        this.subscribers.forEach((subscriber) => subscriber(value));
    }
    async first() {
        if (this.currentValue)
            return this.currentValue;
        return new Promise((resolve) => {
            const unsubscribe = this.subscribe((value) => {
                unsubscribe();
                resolve(value);
            });
        });
    }
    subscribe(onNext) {
        if (this.subscribers.has(onNext)) {
            throw new Error('Subscriber already subscribed');
        }
        this.subscribers.add(onNext);
        return () => this.subscribers.delete(onNext);
    }
    unsubscribe(onNext) {
        if (!this.subscribers.has(onNext)) {
            throw new Error(`Can't unsubscribe, subscriber doesn't exist`);
        }
        this.subscribers.delete(onNext);
    }
}
exports.Observable = Observable;
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