/**
 * Utility function to extract all keys starting with 'x-' (OpenAPI extensions) from an object.
 *
 * @param object - The object from which to extract extension keys.
 * @returns An object containing only the entries whose keys start with 'x-'.
 */
export declare const getXKeysFromObject: (object?: Record<string, unknown>) => {
    [k: string]: unknown;
};
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