evnty/build/signal.js

Async-first, reactive event handling library for complex event flows in browser and Node.js

import { Async } from "./async.js";
export class Signal extends Async {
    #rx;
    [Symbol.toStringTag] = 'Signal';
    static merge(target, ...signals) {
        if (target.disposed) {
            return;
        }
        for (const source of signals){
            void (async ()=>{
                try {
                    const sink = target.sink;
                    for await (const value of source){
                        if (!sink(value) && target.disposed) {
                            return;
                        }
                    }
                } catch  {}
            })();
        }
    }
    constructor(abortSignal){
        super(abortSignal);
    }
    emit(value) {
        if (!this.#rx) return false;
        this.#rx.resolve(value);
        this.#rx = undefined;
        return true;
    }
    receive() {
        if (this.disposed) {
            return Promise.reject(new Error('Disposed'));
        }
        this.#rx ??= Promise.withResolvers();
        return this.#rx.promise;
    }
    dispose() {
        this.#rx?.reject(new Error('Disposed'));
        this.#rx = undefined;
    }
}

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