evnty/build/async.js

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

export class Disposer {
    #target;
    #abortSignal;
    constructor(target, abortSignal){
        if (abortSignal?.aborted) return;
        this.#target = target;
        if (abortSignal) {
            this.#abortSignal = abortSignal;
            abortSignal.addEventListener('abort', this);
        }
    }
    get disposed() {
        return !this.#target;
    }
    [Symbol.dispose]() {
        if (!this.#target) return false;
        this.#target = undefined;
        if (this.#abortSignal) {
            this.#abortSignal.removeEventListener('abort', this);
            this.#abortSignal = undefined;
        }
        return true;
    }
    handleEvent() {
        this.#target?.[Symbol.dispose]();
    }
}
export class Async {
    #sink;
    #disposer;
    constructor(abortSignal){
        this.#disposer = new Disposer(this, abortSignal);
    }
    get disposed() {
        return this.#disposer.disposed;
    }
    get sink() {
        return this.#sink ??= this.emit.bind(this);
    }
    handleEvent(event) {
        this.emit(event);
    }
    catch(onrejected) {
        return this.receive().catch(onrejected);
    }
    finally(onfinally) {
        return this.receive().finally(onfinally);
    }
    then(onfulfilled, onrejected) {
        return this.receive().then(onfulfilled, onrejected);
    }
    async next() {
        try {
            const value = await this.receive();
            return {
                value,
                done: false
            };
        } catch  {
            return {
                value: undefined,
                done: true
            };
        }
    }
    async return() {
        this.dispose?.();
        return {
            value: undefined,
            done: true
        };
    }
    [Symbol.asyncIterator]() {
        return this;
    }
    [Symbol.dispose]() {
        if (this.#disposer[Symbol.dispose]()) {
            this.dispose?.();
        }
    }
}

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