/**
 * Type helper to extract nested property type
 */
type PropType<T, K extends keyof any> = K extends keyof T ? T[K] : K extends `${number}` ? T extends readonly (infer U)[] ? U : any : any;
/**
 * The stateRef relies on data immutability to determine changes.
 * The lens pattern is used as a core part of the stateRef because,
 * it makes it easy to locate and safely change data.
 */
export declare function lens<T extends object>(sceneList?: (string | number | symbol)[]): Lens<T, T>;
export declare class Lens<Root extends object, Focus = Root> {
    private sceneList;
    constructor(sceneList: (string | number | symbol)[]);
    chain<K extends keyof Focus>(prop: K): Lens<Root, PropType<Focus, K>>;
    chain<K extends string | number | symbol>(prop: K): Lens<Root, PropType<Focus, K>>;
    get(targetObject: Root): Focus;
    set(value: Focus): (targetObject: Root) => Root;
    private copyOnWrite;
    private shallowCopy;
}
export {};