/**
 * Returns true if a value is a string
 * @param {any} value value to be tested
 * @return {boolean} true or false
 */
declare function isString(value: any): value is string;
/**
 * Returns true if a value is a number
 * @param {any} value value to be tested
 * @return {boolean} true or false
 */
declare function isNumber(value: any): value is number;
/**
 * Returns true if a value is an object
 * @param {any} value value to be tested
 * @return {boolean} true or false
 */
declare function isObject<T>(value: T): boolean;
/**
 * Returns true if a value is an array
 * @param {any} value value to be tested
 * @return {boolean} true or false
 */
declare function isArray(value: any): value is any[];
/**
 * Returns true if a value is a function
 * @param {any} value value to be tested
 * @return {boolean} true or false
 */
declare function isFunction(value: any): value is Function;
/**
 * Returns true if a value is null
 * @param {any} value value to be tested
 * @return {boolean} true or false
 */
declare function isNull(value: any): value is null;
/**
 * Returns true if a value is undefined
 * @param {any} value value to be tested
 * @return {boolean} true or false
 */
declare function isUndefined(value: any): value is undefined;
export { isString, isNumber, isObject, isArray, isFunction, isNull, isUndefined };
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