/**
 * @hidden
 */
export declare const isPresent: (value: any) => boolean;
/**
 * @hidden
 */
export declare const isBlank: Function;
/**
 * @hidden
 */
export declare const isArray: Function;
/**
 * @hidden
 */
export declare const isFunction: Function;
/**
 * @hidden
 */
export declare const isString: Function;
/**
 * @hidden
 */
export declare const isTruthy: Function;
/**
 * @hidden
 */
export declare const isNullOrEmptyString: (value: string) => boolean;
/**
 * @hidden
 */
export declare const isNotNullOrEmptyString: (value: string) => boolean;
/**
 * @hidden
 */
export declare const isNumeric: Function;
/**
 * @hidden
 */
export declare const isDate: Function;
/**
 * @hidden
 */
export declare type Pair<T, U> = [T, U];
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