/**
 * Determine if a value is undefined
 *
 * @param {Object} val The value to test
 * @returns {boolean} True if the value is undefined, otherwise false
 * @deprecated
 */
export declare function isUndefined(val: any): boolean;
/**
 * Determine if a value is a Buffer
 *
 * @param {Object} val The value to test
 * @returns {boolean} True if value is a Buffer, otherwise false
 * @deprecated
 */
export declare function isBuffer(val: any): any;
/**
 * Determine if a value is an ArrayBuffer
 *
 * @param {Object} val The value to test
 * @returns {boolean} True if value is an ArrayBuffer, otherwise false
 * @deprecated
 */
export declare function isArrayBuffer(val: any): boolean;
/**
 * Determine if a value is a FormData
 *
 * @param {Object} val The value to test
 * @returns {boolean} True if value is an FormData, otherwise false
 */
export declare function isFormData(obj: any): boolean;
export declare function isPlainObject(obj: any): boolean;
export declare function parseHeaders(headers: any): {};
/**
 * Determine if a value is a view on an ArrayBuffer
 *
 * @param {Object} val The value to test
 * @returns {boolean} True if value is a view on an ArrayBuffer, otherwise false
 */
export declare function isArrayBufferView(val: any): any;
/**
 * Determine if a value is an Object
 *
 * @param {Object} val The value to test
 * @returns {boolean} True if value is an Object, otherwise false
 * @deprecated
 */
export declare function isObject(val: any): boolean;
/**
 * Determine if a value is a Function
 *
 * @param {Object} val The value to test
 * @returns {boolean} True if value is a Function, otherwise false
 * @deprecated
 */
export declare function isFunction(val: any): boolean;
/**
 * Determine if a value is a Stream
 *
 * @param {Object} val The value to test
 * @returns {boolean} True if value is a Stream, otherwise false
 * @deprecated
 */
export declare function isStream(val: any): boolean;
/**
 * Determine if a value is a URLSearchParams object
 *
 * @param {Object} val The value to test
 * @returns {boolean} True if value is a URLSearchParams object, otherwise false
 */
export declare function isURLSearchParams(val: any): boolean;
/**
 * Determine if a value is a File
 *
 * @param {Object} val The value to test
 * @returns {boolean} True if value is a File, otherwise false
 * @deprecated
 */
export declare function isFile(val: any): boolean;
/**
 * Determine if a value is a Blob
 *
 * @param {Object} val The value to test
 * @returns {boolean} True if value is a Blob, otherwise false
 * @deprecated
 */
export declare function isBlob(val: any): boolean;