import { Input, Output } from "../output";
/**
 * {@link toObject} takes an array of T values, and a selector that produces
 * key/value pairs from those inputs, and converts this array into an output
 * object with those keys and values.
 *
 * For instance, given an array as follows
 *
 *     [{ s: "a", n: 1 }, { s: "b", n: 2 }, { s: "c", n: 3 }]
 *
 * and whose selector is roughly `(e) => [e.s, e.n]`, the resulting object will be
 *
 *     { "a": 1, "b": 2, "c": 3 }
 *
 */
export declare function toObject<T, V>(iter: Input<Input<T>[]>, selector: (t: T) => Input<[Input<string>, Input<V>]>): Output<{
    [key: string]: V;
}>;
/**
 * {@link groupBy} takes an array of T values, and a selector that prduces
 * key/value pairs from those inputs, and converts this array into an output
 * object, with those keys, and where each property is an array of values, in
 * the case that the same key shows up multiple times in the input.
 *
 * For instance, given an array as follows
 *
 *     [{ s: "a", n: 1 }, { s: "a", n: 2 }, { s: "b", n: 1 }]
 *
 * and whose selector is roughly `(e) => [e.s, e.n]`, the resulting object will be
 *
 *     { "a": [1, 2], "b": [1] }
 *
 */
export declare function groupBy<T, V>(iter: Input<Input<T>[]>, selector: (t: T) => Input<[Input<string>, Input<V>]>): Output<{
    [key: string]: V[];
}>;