import { IAuthenticationManager } from "@esri/arcgis-rest-request";
/**
 * Options for the `ApiKey` constructor.
 */
export interface IApiKeyOptions {
    key: string;
}
/**
 * ```js
 * import { ApiKey } from '@esri/arcgis-rest-auth';
 * const apiKey = new ApiKey("...");
 * ```
 * Used to authenticate with API Keys.
 */
export declare class ApiKey implements IAuthenticationManager {
    /**
     * The current portal the user is authenticated with.
     */
    readonly portal: string;
    private key;
    constructor(options: IApiKeyOptions);
    /**
     * Gets a token (the API Key).
     */
    getToken(url: string): Promise<string>;
}