Adds copy auth state API (#1018)

* Adds copy auth state API

* improvements

* Addresses comments

1 files changed, 7 insertions, 0 deletions

diff --git a/Firebase/Auth/Source/FIRAuthErrorUtils.h b/Firebase/Auth/Source/FIRAuthErrorUtils.h
index c3fad0d..5b8205f 100644
--- a/Firebase/Auth/Source/FIRAuthErrorUtils.h
+++ b/Firebase/Auth/Source/FIRAuthErrorUtils.h
@@ -481,6 +481,13 @@ NS_ASSUME_NONNULL_BEGIN
  */
 + (NSError *)URLResponseErrorWithCode:(NSString *)code message:(nullable NSString *)message;
 
+/** @fn nullUserErrorWithMessage:
+    @brief Constructs an @c NSError with the code and message provided.
+    @param message Error message from the backend, if any.
+    @return The nullable NSError instance associated with the given error message, if one is found.
+ */
++ (NSError *)nullUserErrorWithMessage:(nullable NSString *)message;
+
 /** @fn keychainErrorWithFunction:status:
     @brief Constructs an @c NSError with the @c FIRAuthErrorCodeKeychainError code.
     @param keychainFunction The keychain function which was invoked and yielded an unexpected