@typed/effects/esm/combinators/race.js

Generator-powered Effect management

import { Disposable } from '@typed/disposable';
import { provide, Resume, runPure } from '@typed/env';
import { runEffect } from '../run';
export function* race(...effects) {
    const env = (c) => Resume.create((cb) => {
        const disposable = Disposable.lazy();
        const ifNotResolved = createIfNotResolved(cb, disposable);
        for (const effect of effects) {
            const pure = provide(runEffect(effect), c);
            disposable.addDisposable(runPure(ifNotResolved, pure));
        }
        return disposable;
    });
    return yield env;
}
function createIfNotResolved(cb, disposable) {
    let resolved = false;
    return (value) => {
        if (!resolved) {
            resolved = true;
            disposable.dispose();
            return cb(value);
        }
        return Disposable.None;
    };
}
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