grammy-guard/esm/guard.js

Guard middlewares for grammY

export function guard(predicate, errorHandler) {
    return async (ctx, next) => {
        const predicates = Array.isArray(predicate)
            ? predicate.map((predicate) => predicate(ctx))
            : [predicate(ctx)];
        const isPassed = (await Promise.all(predicates)).every(Boolean);
        if (isPassed) {
            return next();
        }
        if (typeof errorHandler === "function") {
            return errorHandler(ctx, next);
        }
    };
}