export declare const isObject: (object: unknown) => object is object;
export declare const isKeyInObject: <Key extends string>(object: unknown, key: Key) => object is object & Record<Key, unknown>;
/**
 * A utility type that removes all keys with `undefined` values from an object.
 *
 * Note: Optional keys with `undefined` values are not removed.
 *
 * @example
 * ```ts
 * type Foo = { a: string; b: number | undefined; c?: boolean };
 * type Bar = RemoveUndefinedKeys<Foo>;
 * // Bar is { a: string; b: number; c?: boolean }
 * ```
 */
type RemoveUndefinedKeys<T> = {
    [Key in keyof T as T[Key] extends undefined ? never : Key]: Exclude<T[Key], undefined>;
};
/**
 * Remove all keys with `undefined` values from an object. This function only
 * performs a shallow removal, i.e. it does not remove `undefined` values nested
 * in objects.
 *
 * @param object The object to remove `undefined` keys from.
 * @returns A new object with all `undefined` keys removed.
 */
export declare const removeUndefinedKeys: <T extends object>(object: T) => RemoveUndefinedKeys<T>;
export {};