export declare function isObject(item: unknown): item is Record<string, any>;
export declare function extendObject(target: Record<string, any>, source: Record<string, any>): Record<string, any>;
export declare function hasOwnProperty<X extends Record<string, any>, Y extends PropertyKey>(obj: X, prop: Y): obj is X & Record<Y, unknown>;
type Options = {
    transformer?: (input: unknown, output: Record<string, any>, key: string) => boolean | undefined;
    validator?: (input: unknown, key: string) => boolean | undefined;
    prefixParts?: string[];
};
export declare function toFlatObject(data: Record<string, any>, options?: Options): Record<string, any>;
export {};
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