import { JWTPayload } from 'jose';
import { DecodedIdToken } from './types.js';
export declare function formatString(str: string, params?: object): string;
export declare function fetchJson(url: string, init: RequestInit): Promise<any>;
export declare function fetchText(url: string, init: RequestInit): Promise<string>;
export declare function fetchAny(url: string, init: RequestInit): Promise<Response>;
export declare function mapJwtPayloadToDecodedIdToken(payload: JWTPayload): DecodedIdToken;
export declare function addReadonlyGetter(obj: object, prop: string, value: unknown): void;
export declare function deepCopy<T>(value: T): T;
export declare function deepExtend<T>(target: T, source: T): T;
export declare function toUint8Array(key: string): Uint8Array;