@virtualstate/union/lib/deferred.js

Concurrent union

export function deferred() {
    let resolve = undefined, reject = undefined;
    const promise = new Promise((resolveFn, rejectFn) => {
        resolve = resolveFn;
        reject = rejectFn;
    });
    ok(resolve);
    ok(reject);
    return {
        resolve,
        reject,
        promise
    };
}
function ok(value) {
    if (!value) {
        throw new Error("Value not provided");
    }
}
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