Compile time checks for `ChannelOutApi` interface implementation

op-e2e/actions/garbage_channel_out.go

@@ -50,6 +50,9 @@ type WriterApi interface {
 	Write([]byte) (int, error)
 }
 
+// Compile-time check for derive.ChannelOutApi interface implementation for the GarbageChannelOut type.
+var _ derive.ChannelOutApi = (*GarbageChannelOut)(nil)
+
 // GarbageChannelOut is a modified `derive.ChannelOut` that can be configured to behave differently
 // than the original
 type GarbageChannelOut struct {

op-node/rollup/derive/channel_out.go

@@ -28,6 +28,9 @@ type ChannelOutApi interface {
 	OutputFrame(w *bytes.Buffer, maxSize uint64) error
 }
 
+// Compile-time check for ChannelOutApi interface implementation for the ChannelOut type.
+var _ ChannelOutApi = (*ChannelOut)(nil)
+
 type ChannelOut struct {
 	id ChannelID
 	// Frame ID of the next frame to emit. Increment after emitting