import "../_dnt.polyfills.js";
import * as $ from "../deps/scale.js";
export declare function $storageKey<I, O>(palletName: string, entryName: string, $key: $.Codec<I, O>): $.Codec<I, O>;
export declare const $emptyKey: $.Codec<void, void>;
export declare const $partialEmptyKey: $.Codec<void | null, void | null>;
export declare function $partialSingleKey<I, O>($inner: $.Codec<I, O>): $.Codec<I | null, O | null>;
export type PartialMultiKey<T extends unknown[]> = T extends [...infer A, any] ? T | PartialMultiKey<A> : T | null;
export declare function $partialMultiKey<T extends $.AnyCodec[]>(...keys: [...T]): $.Codec<PartialMultiKey<$.OutputTuple<T>>>;