/**
 * @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 { Auth, PhoneInfoOptions, ApplicationVerifier, UserCredential } from '../../model/public_types';
import { PhoneAuthCredential } from '../../core/credentials/phone';
import { AuthCredential } from '../../core';
import { FirebaseError } from '@firebase/util';
/**
 * Provider for generating an {@link PhoneAuthCredential}.
 *
 * @example
 * ```javascript
 * // 'recaptcha-container' is the ID of an element in the DOM.
 * const applicationVerifier = new RecaptchaVerifier('recaptcha-container');
 * const provider = new PhoneAuthProvider(auth);
 * const verificationId = await provider.verifyPhoneNumber('+16505550101', applicationVerifier);
 * // Obtain the verificationCode from the user.
 * const phoneCredential = PhoneAuthProvider.credential(verificationId, verificationCode);
 * const userCredential = await signInWithCredential(auth, phoneCredential);
 * ```
 *
 * @public
 */
export declare class PhoneAuthProvider {
    /** Always set to {@link ProviderId}.PHONE. */
    static readonly PROVIDER_ID: 'phone';
    /** Always set to {@link SignInMethod}.PHONE. */
    static readonly PHONE_SIGN_IN_METHOD: 'phone';
    /** Always set to {@link ProviderId}.PHONE. */
    readonly providerId: "phone";
    private readonly auth;
    /**
     * @param auth - The Firebase {@link Auth} instance in which sign-ins should occur.
     *
     */
    constructor(auth: Auth);
    /**
     *
     * Starts a phone number authentication flow by sending a verification code to the given phone
     * number.
     *
     * @example
     * ```javascript
     * const provider = new PhoneAuthProvider(auth);
     * const verificationId = await provider.verifyPhoneNumber(phoneNumber, applicationVerifier);
     * // Obtain verificationCode from the user.
     * const authCredential = PhoneAuthProvider.credential(verificationId, verificationCode);
     * const userCredential = await signInWithCredential(auth, authCredential);
     * ```
     *
     * @example
     * An alternative flow is provided using the `signInWithPhoneNumber` method.
     * ```javascript
     * const confirmationResult = signInWithPhoneNumber(auth, phoneNumber, applicationVerifier);
     * // Obtain verificationCode from the user.
     * const userCredential = confirmationResult.confirm(verificationCode);
     * ```
     *
     * @param phoneInfoOptions - The user's {@link PhoneInfoOptions}. The phone number should be in
     * E.164 format (e.g. +16505550101).
     * @param applicationVerifier - For abuse prevention, this method also requires a
     * {@link ApplicationVerifier}. This SDK includes a reCAPTCHA-based implementation,
     * {@link RecaptchaVerifier}.
     *
     * @returns A Promise for a verification ID that can be passed to
     * {@link PhoneAuthProvider.credential} to identify this flow..
     */
    verifyPhoneNumber(phoneOptions: PhoneInfoOptions | string, applicationVerifier: ApplicationVerifier): Promise<string>;
    /**
     * Creates a phone auth credential, given the verification ID from
     * {@link PhoneAuthProvider.verifyPhoneNumber} and the code that was sent to the user's
     * mobile device.
     *
     * @example
     * ```javascript
     * const provider = new PhoneAuthProvider(auth);
     * const verificationId = provider.verifyPhoneNumber(phoneNumber, applicationVerifier);
     * // Obtain verificationCode from the user.
     * const authCredential = PhoneAuthProvider.credential(verificationId, verificationCode);
     * const userCredential = signInWithCredential(auth, authCredential);
     * ```
     *
     * @example
     * An alternative flow is provided using the `signInWithPhoneNumber` method.
     * ```javascript
     * const confirmationResult = await signInWithPhoneNumber(auth, phoneNumber, applicationVerifier);
     * // Obtain verificationCode from the user.
     * const userCredential = await confirmationResult.confirm(verificationCode);
     * ```
     *
     * @param verificationId - The verification ID returned from {@link PhoneAuthProvider.verifyPhoneNumber}.
     * @param verificationCode - The verification code sent to the user's mobile device.
     *
     * @returns The auth provider credential.
     */
    static credential(verificationId: string, verificationCode: string): PhoneAuthCredential;
    /**
     * Generates an {@link AuthCredential} from a {@link UserCredential}.
     * @param userCredential - The user credential.
     */
    static credentialFromResult(userCredential: UserCredential): AuthCredential | null;
    /**
     * Returns an {@link AuthCredential} when passed an error.
     *
     * @remarks
     *
     * This method works for errors like
     * `auth/account-exists-with-different-credentials`. This is useful for
     * recovering when attempting to set a user's phone number but the number
     * in question is already tied to another account. For example, the following
     * code tries to update the current user's phone number, and if that
     * fails, links the user with the account associated with that number:
     *
     * ```js
     * const provider = new PhoneAuthProvider(auth);
     * const verificationId = await provider.verifyPhoneNumber(number, verifier);
     * try {
     *   const code = ''; // Prompt the user for the verification code
     *   await updatePhoneNumber(
     *       auth.currentUser,
     *       PhoneAuthProvider.credential(verificationId, code));
     * } catch (e) {
     *   if (e.code === 'auth/account-exists-with-different-credential') {
     *     const cred = PhoneAuthProvider.credentialFromError(e);
     *     await linkWithCredential(auth.currentUser, cred);
     *   }
     * }
     *
     * // At this point, auth.currentUser.phoneNumber === number.
     * ```
     *
     * @param error - The error to generate a credential from.
     */
    static credentialFromError(error: FirebaseError): AuthCredential | null;
    private static credentialFromTaggedObject;
}