export declare function deepFreeze<T>(obj: T): T;
export declare function cloneAndChange(obj: any, changer: (orig: any) => any): any;
export declare function deepClone<T>(obj: T): T;
export declare function isPlainObject(obj: object): boolean;
export declare function removeUndefined<T extends object = any>(obj: T): T;
export declare function cloneAndChangeByKV(obj: any, changer: (key: string, orig: any) => any): any;
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