Enforce no default value in state.

features/template/src/main/kotlin/io/element/android/features/template/TemplateState.kt

@@ -17,6 +17,11 @@
 package io.element.android.features.template
 
 // TODO add your ui models. Remove the eventSink if you don't have events.
+// Do not use default value, so no member get forgotten in the presenters.
 data class TemplateState(
-    val eventSink: (TemplateEvents) -> Unit = {}
+    val eventSink: (TemplateEvents) -> Unit
+)
+
+fun aTemplateState() = TemplateState(
+    eventSink = {}
 )

features/template/src/main/kotlin/io/element/android/features/template/TemplateView.kt

@@ -50,6 +50,6 @@ fun TemplateViewDarkPreview() = ElementPreviewDark { ContentToPreview() }
 @Composable
 private fun ContentToPreview() {
     TemplateView(
-        state = TemplateState(),
+        state = aTemplateState(),
     )
 }