split UI interface into Renderer and Updater

renderer.go

@@ -0,0 +1,9 @@
+package jaws
+
+import "io"
+
+type Renderer interface {
+	// JawsRender is called once per Element when rendering the initial webpage.
+	// Do not call this yourself unless it's from within another JawsRender implementation.
+	JawsRender(e *Element, w io.Writer, params []any) error
+}

ui.go

@@ -1,17 +1,8 @@
 package jaws
 
-import (
-	"io"
-)
-
 // UI defines the required methods on JaWS UI objects.
 // In addition, all UI objects must be comparable so they can be used as map keys.
 type UI interface {
-	// JawsRender is called once per Element when rendering the initial webpage.
-	// Do not call this yourself unless it's from within another JawsRender implementation.
-	JawsRender(e *Element, w io.Writer, params []any) error
-
-	// JawsUpdate is called for an Element that has been marked dirty to update it's HTML.
-	// Do not call this yourself unless it's from within another JawsUpdate implementation.
-	JawsUpdate(e *Element)
+	Renderer
+	Updater
 }

updater.go

@@ -0,0 +1,7 @@
+package jaws
+
+type Updater interface {
+	// JawsUpdate is called for an Element that has been marked dirty to update it's HTML.
+	// Do not call this yourself unless it's from within another JawsUpdate implementation.
+	JawsUpdate(e *Element)
+}