@nesvet/n/dist/when.js

Various utilities

export function when(check, callback, options = {}) {
    if (typeof callback == "object") {
        options = callback;
        callback = undefined;
    }
    const { interval = 1, timeout = null, context } = options;
    let checkResolve;
    let checkInterval;
    let rejectionTimeout;
    async function checkFunc() {
        const result = await check();
        if (result) {
            checkResolve(result);
            return true;
        }
        return false;
    }
    return new Promise((resolve, reject) => {
        checkResolve = resolve;
        checkFunc().then(isPassed => {
            if (!isPassed) {
                checkInterval = setInterval(checkFunc, interval);
                if (timeout)
                    rejectionTimeout = setTimeout(reject, timeout);
            }
        });
    }).then(result => {
        clearInterval(checkInterval);
        clearTimeout(rejectionTimeout);
        callback?.call(context, result);
        return result;
    }, () => {
        clearInterval(checkInterval);
        throw new Error("timeout");
    });
}
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