/**
 * (C) Copyright IBM Corp. 2019, 2024.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { Authenticator } from './authenticator';
import { AuthenticateOptions } from './authenticator-interface';
/** Configuration options for basic authentication. */
export type Options = {
    /** The username to be used in basic authorization. */
    username: string;
    /** The password to be used in basic authorization. */
    password: string;
};
/**
 * The BasicAuthenticator is used to add basic authentication information to
 *   requests.
 *
 * Basic Authorization will be sent as an Authorization header in the form:
 *
 *     Authorization: Basic \<encoded username and password\>
 *
 */
export declare class BasicAuthenticator extends Authenticator {
    protected requiredOptions: string[];
    protected authHeader: {
        Authorization: string;
    };
    /**
     * Create a new BasicAuthenticator instance.
     *
     * @param options - Configuration options for basic authentication.
     * This should be an object containing these fields:
     * - username: the username portion of basic authentication
     * - password: the password portion of basic authentication
     *
     * @throws Error: the configuration options are not valid.
     */
    constructor(options: Options);
    /**
     * Add basic authentication information to `requestOptions`. The basic authentication information
     * will be set in the Authorization property of `requestOptions.headers` in the form:
     *
     *     Authorization: Basic \<encoded username and password\>
     *
     * @param requestOptions - The request to augment with authentication information.
     */
    authenticate(requestOptions: AuthenticateOptions): Promise<void>;
    /**
     * Returns the authenticator's type ('basic').
     *
     * @returns a string that indicates the authenticator's type
     */
    authenticationType(): string;
}