export declare const UNSAFE_KEYS: Set<string>;
export declare function deepCloneNullPrototype(obj: object): object;
export declare function ensure(condition: boolean, message: string): void;
export declare function hasOwnKey(obj: object, key: string): boolean;
export declare function isLookupObject(value: any): value is Record<string, any>;
export declare function lookupOwnValue(obj: any, key: string): any;