/**
 * Flattens an object to a list of its keys, traversing deeply into nested objects and arrays of objects.
 *
 * @note By default Nested array values are flattened to `arrayKey.${index}.subKey`.
 * This can be changed to `arrayKey[${index}].subKey` by setting `options.arrayKeysIndexStyle` to `'braces-with-dot'`.
 * Or it can also be changed to `arrayKey[${index}]subKey` by setting `options.arrayKeysIndexStyle` to `'braces'`.
 *
 * @param obj The object of which to deeply retrieve its keys
 * @param options The options with which to customize the output of this function
 * @returns An array of strings holding the keys of the object
 */
declare function getDeepObjectKeys(obj: object, options?: GetDeepObjectKeysOptions): string[];
/**
 * The options for {@link getDeepObjectKeys}
 */
interface GetDeepObjectKeysOptions {
    /**
     * Whether to use `.${index}.` (`'dotted'`), `[${index}].`, (`'braces-with-dot'`) or `[${index}]` (`'braces'`) to separate array keys
     * @default 'dotted'
     */
    arrayKeysIndexStyle?: 'dotted' | 'braces-with-dot' | 'braces';
}

export { type GetDeepObjectKeysOptions, getDeepObjectKeys };