export declare const isUndefined: (obj: any) => obj is undefined;
export declare const isNil: (val: any) => val is null | undefined;
export declare const isObject: (fn: any) => fn is object;
export declare function isEmptyObject(obj: any): boolean;
export declare function isPlainObject(fn: any): fn is object;
export declare function addLeadingSlash(path?: string): string;
export declare function normalizePath(path?: string): string;
export declare const stripEndSlash: (path: string) => string;
export declare const isFunction: (val: any) => val is Function;
export declare const isString: (val: any) => val is string;
export declare const isNumber: (val: any) => val is number;
export declare const isConstructor: (val: any) => boolean;
export declare const isEmpty: (array: any) => boolean;
export declare const isSymbol: (val: any) => val is symbol;
export declare function isClass(fn: any): boolean;
export declare function isClassStrict(fn: any): boolean;
export declare function isPromise(obj: any): obj is Promise<any>;
export declare function isNilOrEmptyString(str?: string | undefined | null): str is null | undefined | '';
export declare function checkMeta(meta?: {}, data?: {}): boolean;
export declare function safeBoolean(value?: undefined | null | boolean | string): boolean;