Revert changes except doc comments

Author: morganchen12

FirebaseAppCheck/Sources/DeviceCheckProvider/DCDevice+FIRDeviceCheckTokenGenerator.h

@@ -16,7 +16,8 @@
 
 #import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRAppCheckAvailability.h"
 
-#if __has_include(<DeviceCheck/DeviceCheck.h>)
+#if FIR_DEVICE_CHECK_SUPPORTED_TARGETS
+
 #import <DeviceCheck/DeviceCheck.h>
 
 #import "FirebaseAppCheck/Sources/DeviceCheckProvider/FIRDeviceCheckTokenGenerator.h"
@@ -29,4 +30,4 @@ NS_ASSUME_NONNULL_BEGIN
 
 NS_ASSUME_NONNULL_END
 
-#endif  // __has_include(<DeviceCheck/DeviceCheck.h>)
+#endif  // FIR_DEVICE_CHECK_SUPPORTED_TARGETS

FirebaseAppCheck/Sources/DeviceCheckProvider/FIRDeviceCheckProvider.m

@@ -16,11 +16,9 @@
 
 #import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRAppCheckAvailability.h"
 
-#import <Foundation/Foundation.h>
+#if FIR_DEVICE_CHECK_SUPPORTED_TARGETS
 
-#if __has_include(<DeviceCheck/DeviceCheck.h>)
-#import <DeviceCheck/DeviceCheck.h>
-#endif
+#import <Foundation/Foundation.h>
 
 #if __has_include(<FBLPromises/FBLPromises.h>)
 #import <FBLPromises/FBLPromises.h>
@@ -64,16 +62,7 @@ - (instancetype)initWithAPIService:(id<FIRDeviceCheckAPIServiceProtocol>)APIServ
 }
 
 - (instancetype)initWithAPIService:(id<FIRDeviceCheckAPIServiceProtocol>)APIService {
-#if __has_include(<DeviceCheck/DeviceCheck.h>)
   return [self initWithAPIService:APIService deviceTokenGenerator:[DCDevice currentDevice]];
-#else
-  NSException *exception = [NSException
-      exceptionWithName:NSInternalInconsistencyException
-                 reason:@"Unreachable code segment. Please file a bug at "
-                        @"https://github.com/firebase/firebase-ios-sdk/issues/new/choose."
-               userInfo:nil];
-  @throw exception;
-#endif
 }
 
 - (nullable instancetype)initWithApp:(FIRApp *)app {
@@ -134,3 +123,5 @@ - (void)getTokenWithCompletion:(void (^)(FIRAppCheckToken *_Nullable token,
 @end
 
 NS_ASSUME_NONNULL_END
+
+#endif  // FIR_DEVICE_CHECK_SUPPORTED_TARGETS

FirebaseAppCheck/Sources/DeviceCheckProvider/FIRDeviceCheckProviderFactory.m

@@ -14,6 +14,10 @@
  * limitations under the License.
  */
 
+#import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRAppCheckAvailability.h"
+
+#if FIR_DEVICE_CHECK_SUPPORTED_TARGETS
+
 #import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRDeviceCheckProviderFactory.h"
 
 #import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRAppCheck.h"
@@ -30,3 +34,5 @@ + (void)load {
 }
 
 @end
+
+#endif  // FIR_DEVICE_CHECK_SUPPORTED_TARGETS

FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRAppCheckAvailability.h

@@ -20,6 +20,9 @@
 
 #pragma mark - DeviceCheck
 
+// Targets where DeviceCheck framework is available to be used in preprocessor conditions.
+#define FIR_DEVICE_CHECK_SUPPORTED_TARGETS TARGET_OS_IOS || TARGET_OS_OSX || TARGET_OS_TV
+
 // `DeviceCheckProvider` availability.
 #define FIR_DEVICE_CHECK_PROVIDER_AVAILABILITY \
   API_AVAILABLE(ios(11.0), macos(10.15), tvos(11.0)) API_UNAVAILABLE(watchos)

FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRDeviceCheckProvider.h

@@ -19,6 +19,8 @@
 #import "FIRAppCheckAvailability.h"
 #import "FIRAppCheckProvider.h"
 
+#if FIR_DEVICE_CHECK_SUPPORTED_TARGETS
+
 @class FIRApp;
 @protocol FIRDeviceCheckAPIServiceProtocol;
 @protocol FIRDeviceCheckTokenGenerator;
@@ -43,3 +45,5 @@ NS_SWIFT_NAME(DeviceCheckProvider)
 @end
 
 NS_ASSUME_NONNULL_END
+
+#endif  // FIR_DEVICE_CHECK_SUPPORTED_TARGETS

FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRDeviceCheckProviderFactory.h

@@ -14,9 +14,12 @@
  * limitations under the License.
  */
 
+#import "FIRAppCheckAvailability.h"
+
+#if FIR_DEVICE_CHECK_SUPPORTED_TARGETS
+
 #import <Foundation/Foundation.h>
 
-#import "FIRAppCheckAvailability.h"
 #import "FIRAppCheckProviderFactory.h"
 
 NS_ASSUME_NONNULL_BEGIN
@@ -33,3 +36,5 @@ NS_SWIFT_NAME(DeviceCheckProviderFactory)
 @end
 
 NS_ASSUME_NONNULL_END
+
+#endif  // FIR_DEVICE_CHECK_SUPPORTED_TARGETS