type Calleable<T> = Undefined<(...args: any) => T>;
export declare function valueIsDefined<T = any>(value: T): value is NonNullable<T>;
export declare function valueIsUndefined(value: any): value is undefined | null;
export declare function parseBoolean(value: any): boolean;
export declare function parse<T>(value: string): T;
export declare function evalValueOrFunction<T>(value: ValueOrFunction<T>): T;
export declare function freeze<T>(value: T): Readonly<T>;
export declare function seal<O>(value: O): Readonly<O>;
export declare function callback<T = any>(call: Calleable<T>, ...args: any): Undefined<T>;
export declare function normalizeJson(payload: LiteralObject): LiteralObject;
export {};