Add some type annotations.

Author: gdotdesign

source/ActionSheet.mint

@@ -305,7 +305,7 @@ global component Ui.ActionSheet {
     href : String,
     target : String,
     onClick : Function(Html.Event, Promise(Void)) = Promise.never1
-  ) {
+  ) : Html {
     let contents =
       <>
         if Html.isNotEmpty(iconBefore) {

source/NavItem.mint

@@ -72,7 +72,11 @@ component Ui.NavItem {
   }
 
   /* Renders the contents of an item. */
-  fun renderContents (iconBefore : Html, iconAfter : Html, label : String) {
+  fun renderContents (
+    iconBefore : Html,
+    iconAfter : Html,
+    label : String
+  ) : Html {
     <>
       if Html.isNotEmpty(iconBefore) {
         <Ui.Icon icon={iconBefore}/>