/**
 * @license
 * Copyright 2020 Google LLC
 *
 * 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 { PhoneOrOauthTokenResponse } from '../../api/authentication/mfa';
import { AuthInternal } from '../../model/auth';
import { IdTokenResponse } from '../../model/id_token';
/**
 * Interface that represents the credentials returned by an {@link AuthProvider}.
 *
 * @remarks
 * Implementations specify the details about each auth provider's credential requirements.
 *
 * @public
 */
export declare class AuthCredential {
    /**
     * The authentication provider ID for the credential.
     *
     * @remarks
     * For example, 'facebook.com', or 'google.com'.
     */
    readonly providerId: string;
    /**
     * The authentication sign in method for the credential.
     *
     * @remarks
     * For example, {@link SignInMethod}.EMAIL_PASSWORD, or
     * {@link SignInMethod}.EMAIL_LINK. This corresponds to the sign-in method
     * identifier as returned in {@link fetchSignInMethodsForEmail}.
     */
    readonly signInMethod: string;
    /** @internal */
    protected constructor(
    /**
     * The authentication provider ID for the credential.
     *
     * @remarks
     * For example, 'facebook.com', or 'google.com'.
     */
    providerId: string, 
    /**
     * The authentication sign in method for the credential.
     *
     * @remarks
     * For example, {@link SignInMethod}.EMAIL_PASSWORD, or
     * {@link SignInMethod}.EMAIL_LINK. This corresponds to the sign-in method
     * identifier as returned in {@link fetchSignInMethodsForEmail}.
     */
    signInMethod: string);
    /**
     * Returns a JSON-serializable representation of this object.
     *
     * @returns a JSON-serializable representation of this object.
     */
    toJSON(): object;
    /** @internal */
    _getIdTokenResponse(_auth: AuthInternal): Promise<PhoneOrOauthTokenResponse>;
    /** @internal */
    _linkToIdToken(_auth: AuthInternal, _idToken: string): Promise<IdTokenResponse>;
    /** @internal */
    _getReauthenticationResolver(_auth: AuthInternal): Promise<IdTokenResponse>;
}