import { State } from "../reducers";
/**
 * Copyright (C) 2019-present, Rimeto, LLC.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
/**
 * A generic type that cannot be `undefined`.
 */
declare type Defined<T> = Exclude<T, undefined>;
/**
 * `SelectorChainObjectWrapper` gives TypeScript visibility into the properties of
 * an `SelectorChainType` object at compile-time.
 */
declare type SelectorChainObjectWrapper<S extends State<string>, T> = {
    [K in keyof T]-?: SelectorChainType<S, T[K]>;
};
/**
 * Data accessor interface to dereference the value of the `TSOCType`.
 */
export interface SelectorChainDataAccessor<S extends State<string>, T> {
    /**
     * Data accessor without a default value. If no data exists,
     * `undefined` is returned.
     */
    (noDefaultValue?: undefined): Defined<T> | undefined;
    /**
     * Data accessor with default value.
     */
    (defaultValue: NonNullable<T>): NonNullable<T>;
    (nullDefaultValue: T extends null ? null : never): Defined<T>;
}
/**
 * `SelectorChainArrayWrapper` gives TypeScript visibility into the `SelectorChainType` values of an array
 * without exposing Array methods (it is problematic to attempt to invoke methods during
 * the course of an optional chain traversal).
 */
export interface SelectorChainArrayWrapper<S extends State<string>, T> {
    length: SelectorChainType<S, number>;
    [K: number]: SelectorChainType<S, T>;
}
/**
 * Data accessor interface to dereference the value of an `any` type.
 * @extends SelectorChainDataAccessor<any>
 */
export interface SelectorChainAny extends SelectorChainDataAccessor<any, any> {
    [K: string]: SelectorChainAny;
}
/**
 * `SelectorChainDataWrapper` selects between `SelectorChainArrayWrapper`, `SelectorChainObjectWrapper`, and `SelectorChainDataAccessor`
 * to wrap Arrays, Objects and all other types respectively.
 */
export declare type SelectorChainDataWrapper<S extends State<string>, T> = 0 extends (1 & T) ? SelectorChainAny : T extends any[] ? SelectorChainArrayWrapper<S, T[number]> : T extends object ? SelectorChainObjectWrapper<S, T> : SelectorChainDataAccessor<S, T>;
/**
 * An object that supports optional chaining
 */
export declare type SelectorChainType<S extends State<string>, T> = SelectorChainDataAccessor<S, T> & SelectorChainDataWrapper<S, NonNullable<T>>;
/**
 * Optional chaining with default values. To inspect a property value in
 * a tree-like structure, invoke it as a function, optionally passing a default value.
 *
 * @example
 *   // Given:
 *   const x = oc<T>({
 *     a: 'hello',
 *     b: { d: 'world' },
 *     c: [-100, 200, -300],
 *   });
 *
 *   // Then:
 *   x.a() === 'hello'
 *   x.b.d() === 'world'
 *   x.c[0]() === -100
 *   x.c[100]() === undefined
 *   x.c[100](1234) === 1234
 *   x.c.map((e) => e()) === [-100, 200, -300]
 *   x.d.e() === undefined
 *   x.d.e('optional default value') === 'optional default value'
 *   (x as any).y.z.a.b.c.d.e.f.g.h.i.j.k() === undefined
 */
export declare function selector<S extends State<string>, T>(data?: T): SelectorChainType<S, T>;
export {};