public override async Task FindByEmailAsync()

in src/Amazon.AspNetCore.Identity.Cognito/CognitoUserManager.cs [70:88]

• 19 lines of code
• 3 McCabe index (conditional complexity)

        public override async Task<TUser> FindByEmailAsync(string email)
        {
            ThrowIfDisposed();
            if (email == null)
            {
                throw new ArgumentNullException(nameof(email));
            }
#if NETSTANDARD2_0
            email = NormalizeKey(email);
#else
            email = NormalizeEmail(email);
#endif
            var user = await _userStore.FindByEmailAsync(email, CancellationToken).ConfigureAwait(false);
            if (user != null)
            {
                await PopulateTokens(user, ClaimTypes.Email, email).ConfigureAwait(false);
            }
            return user;
        }