triStateBoolean.ts

function isNotNullOrUndefined<ValueType>(
    value: ValueType | null | undefined
): value is ValueType {
    if (value === null || value === undefined) {
        return false;
    }

    return true;
}


const triStateBooleanAnd = (...params: (boolean | undefined)[]) => {
    const filtered = params.filter(isNotNullOrUndefined);
    if (filtered.length) {
        return filtered.every(Boolean);
    } else {
        return undefined;
    }
};

const triStateBooleanOr = (...params: (boolean | undefined)[]) => {
    const filtered = params.filter(isNotNullOrUndefined);
    if (filtered.length) {
        return filtered.some(Boolean);
    } else {
        return undefined;
    }
};