type StripUndefined<T> = {
    [K in keyof T as T[K] extends undefined ? never : K]: T[K];
};
export declare function omitUndefined<T extends object>(obj: T | undefined): StripUndefined<T>;
export declare function mergeOptions<T extends object, U extends object, V extends object>(source1: T, source2?: U, source3?: V): StripUndefined<T> & StripUndefined<U> & StripUndefined<V>;
export {};
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