/**
 * Tiny Validator utility.
 */
export declare type Validator = (d: any) => string | false;
export declare const Validate: {
    /** Checks a series of rules, returns the first error (or false if none) */
    many: (rules: Validator[]) => (d: any) => string | false;
    truthy: (d: any) => false | "Expected value to be truthy";
    object: (d: any) => false | "Expected value to be an object";
    array: (d: any) => false | "Expected value to be an array";
    string: (d: any) => false | "Expected value to be a string";
    hasKey: (key: string) => (d: any) => string | false;
    arrayWithEach: (validate: Validator) => (d: any) => string | false;
    atKey: (key: string, validate: Validator) => (d: any) => string | false;
};