auth/phone-invisible.html [162:255]:
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      window.signingIn = true;
      updateSignInButtonUI();
      var phoneNumber = getPhoneNumberFromUserInput();
      var appVerifier = window.recaptchaVerifier;
      firebase.auth().signInWithPhoneNumber(phoneNumber, appVerifier)
          .then(function (confirmationResult) {
            // SMS sent. Prompt user to type the code from the message, then sign the
            // user in with confirmationResult.confirm(code).
            window.confirmationResult = confirmationResult;
            window.signingIn = false;
            updateSignInButtonUI();
            updateVerificationCodeFormUI();
            updateVerifyCodeButtonUI();
            updateSignInFormUI();
          }).catch(function (error) {
            // Error; SMS not sent
            console.error('Error during signInWithPhoneNumber', error);
            window.alert('Error during signInWithPhoneNumber:\n\n'
                + error.code + '\n\n' + error.message);
            window.signingIn = false;
            updateSignInFormUI();
            updateSignInButtonUI();
          });
    }
  }

  /**
   * Function called when clicking the "Verify Code" button.
   */
  function onVerifyCodeSubmit(e) {
    e.preventDefault();
    if (!!getCodeFromUserInput()) {
      window.verifyingCode = true;
      updateVerifyCodeButtonUI();
      var code = getCodeFromUserInput();
      confirmationResult.confirm(code).then(function (result) {
        // User signed in successfully.
        var user = result.user;
        window.verifyingCode = false;
        window.confirmationResult = null;
        updateVerificationCodeFormUI();
      }).catch(function (error) {
        // User couldn't sign in (bad verification code?)
        console.error('Error while checking the verification code', error);
        window.alert('Error while checking the verification code:\n\n'
            + error.code + '\n\n' + error.message);
        window.verifyingCode = false;
        updateSignInButtonUI();
        updateVerifyCodeButtonUI();
      });
    }
  }

  /**
   * Cancels the verification code input.
   */
  function cancelVerification(e) {
    e.preventDefault();
    window.confirmationResult = null;
    updateVerificationCodeFormUI();
    updateSignInFormUI();
  }

  /**
   * Signs out the user when the sign-out button is clicked.
   */
  function onSignOutClick() {
    firebase.auth().signOut();
  }

  /**
   * Reads the verification code from the user input.
   */
  function getCodeFromUserInput() {
    return document.getElementById('verification-code').value;
  }

  /**
   * Reads the phone number from the user input.
   */
  function getPhoneNumberFromUserInput() {
    return document.getElementById('phone-number').value;
  }

  /**
   * Returns true if the phone number is valid.
   */
  function isPhoneNumberValid() {
    var pattern = /^\+[0-9\s\-\(\)]+$/;
    var phoneNumber = getPhoneNumberFromUserInput();
    return phoneNumber.search(pattern) !== -1;
  }

  /**
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auth/phone-visible.html [170:263]:
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      window.signingIn = true;
      updateSignInButtonUI();
      var phoneNumber = getPhoneNumberFromUserInput();
      var appVerifier = window.recaptchaVerifier;
      firebase.auth().signInWithPhoneNumber(phoneNumber, appVerifier)
          .then(function (confirmationResult) {
            // SMS sent. Prompt user to type the code from the message, then sign the
            // user in with confirmationResult.confirm(code).
            window.confirmationResult = confirmationResult;
            window.signingIn = false;
            updateSignInButtonUI();
            updateVerificationCodeFormUI();
            updateVerifyCodeButtonUI();
            updateSignInFormUI();
          }).catch(function (error) {
            // Error; SMS not sent
            console.error('Error during signInWithPhoneNumber', error);
            window.alert('Error during signInWithPhoneNumber:\n\n'
                + error.code + '\n\n' + error.message);
            window.signingIn = false;
            updateSignInFormUI();
            updateSignInButtonUI();
          });
    }
  }

  /**
   * Function called when clicking the "Verify Code" button.
   */
  function onVerifyCodeSubmit(e) {
    e.preventDefault();
    if (!!getCodeFromUserInput()) {
      window.verifyingCode = true;
      updateVerifyCodeButtonUI();
      var code = getCodeFromUserInput();
      confirmationResult.confirm(code).then(function (result) {
        // User signed in successfully.
        var user = result.user;
        window.verifyingCode = false;
        window.confirmationResult = null;
        updateVerificationCodeFormUI();
      }).catch(function (error) {
        // User couldn't sign in (bad verification code?)
        console.error('Error while checking the verification code', error);
        window.alert('Error while checking the verification code:\n\n'
            + error.code + '\n\n' + error.message);
        window.verifyingCode = false;
        updateSignInButtonUI();
        updateVerifyCodeButtonUI();
      });
    }
  }

  /**
   * Cancels the verification code input.
   */
  function cancelVerification(e) {
    e.preventDefault();
    window.confirmationResult = null;
    updateVerificationCodeFormUI();
    updateSignInFormUI();
  }

  /**
   * Signs out the user when the sign-out button is clicked.
   */
  function onSignOutClick() {
    firebase.auth().signOut();
  }

  /**
   * Reads the verification code from the user input.
   */
  function getCodeFromUserInput() {
    return document.getElementById('verification-code').value;
  }

  /**
   * Reads the phone number from the user input.
   */
  function getPhoneNumberFromUserInput() {
    return document.getElementById('phone-number').value;
  }

  /**
   * Returns true if the phone number is valid.
   */
  function isPhoneNumberValid() {
    var pattern = /^\+[0-9\s\-\(\)]+$/;
    var phoneNumber = getPhoneNumberFromUserInput();
    return phoneNumber.search(pattern) !== -1;
  }

  /**
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