import { DynamicValue, Listener, Unsubscriber } from "./DynamicValue";
/**
 * A [[DynamicValue]] reducer returning the value at an index
 *
 * @example
 * ```javascript
 * new IndexValue(new SplitValue(new TextValue("a,b,c"),","),0).onValue(val=>
 *  val === "a" //true
 * )
 * ```
 */
export declare class IndexValue<V> implements DynamicValue<V> {
    __variant__: string;
    input: DynamicValue<object>;
    name: string | void;
    index: string | number;
    constructor(input: DynamicValue<object>, index: string | number, name?: string);
    onValue(listener: Listener<V>): Unsubscriber;
    getValue(): Promise<any>;
    static fromJSON(json: {
        input: any;
        index: string | number;
        name?: string;
    }): any;
}