--- /dev/null
+/*
+ * Copyright 2018 Google
+ *
+ * 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.
+ */
+
+#ifndef FIRCoreConfigurable_h
+#define FIRCoreConfigurable_h
+
+#import <Foundation/Foundation.h>
+
+@class FIRApp;
+
+NS_ASSUME_NONNULL_BEGIN
+
+/// Provides an interface to set up an SDK once a `FIRApp` is configured.
+NS_SWIFT_NAME(CoreConfigurable)
+@protocol FIRCoreConfigurable
+
+/// Configure the SDK if needed ahead of time. This method is called when the developer calls
+/// `FirebaseApp.configure()`.
++ (void)configureWithApp:(FIRApp *)app;
+
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif /* FIRCoreConfigurable_h */