import type { TourClassNames, TourControls } from "../types";
import type { DeepReadonly, ReadonlyStepProps, StepProps } from "./types";
/**
 * Creates a shallow clone of step properties with deep clones of nested objects.
 * @param props The properties to clone.
 * @returns A mutable copy of the properties.
 */
export declare function cloneStepProps<T>(props: ReadonlyStepProps<T>): StepProps<T>;
/** Copies `controls` into frozen records, with frozen copies of their `keys`. */
export declare function cloneControls(controls: DeepReadonly<TourControls> | undefined): TourControls | undefined;
/**
 * Copies `classNames` into a frozen record. Its class arrays are shared rather than copied: they are
 * typed readonly and nothing in the tour writes to them, and copying them costs bundle size.
 */
export declare function cloneClassNames(classNames: TourClassNames | undefined): TourClassNames | undefined;
/**
 * Creates a deep-frozen copy of step properties.
 * @param props The properties to freeze.
 * @returns An immutable copy of the properties.
 */
export declare function freezeStepProps<T>(props: ReadonlyStepProps<T>): ReadonlyStepProps<T>;