fix(template-require-input-type): flag valueless type attribute per HTML missing-value default (Copilot review)

Author: johanrd

lib/rules/template-require-input-type.js

@@ -96,7 +96,25 @@ module.exports = {
         }
 
         const value = typeAttr.value;
-        if (value && value.type === 'GlimmerTextNode') {
+
+        // Valueless attribute form (`<input type />`) — per HTML spec, a
+        // present-but-empty type attribute resolves to the missing-value
+        // default ("Text state"). That's the same runtime result as
+        // `type=""`, which we already flag. Treat them consistently:
+        // flag as invalid('') and autofix to `type="text"`.
+        if (!value) {
+          context.report({
+            node: typeAttr,
+            messageId: 'invalid',
+            data: { value: '' },
+            fix(fixer) {
+              return fixer.replaceText(typeAttr, 'type="text"');
+            },
+          });
+          return;
+        }
+
+        if (value.type === 'GlimmerTextNode') {
           const typeValue = value.chars.toLowerCase();
           if (typeValue === '') {
             context.report({

tests/lib/rules/template-require-input-type.js

@@ -36,6 +36,15 @@ const invalidHbs = [
     output: '<input type="text" />',
     errors: [{ message: errInvalid('TEXTY') }],
   },
+  // Valueless type attribute — per HTML spec resolves to the missing-value
+  // default (Text state), same runtime result as `type=""`. Flag and autofix
+  // to `type="text"`. (Output loses the pre-slash space because the
+  // valueless attr range ends at `type`; prettier will re-insert if needed.)
+  {
+    code: '<input type />',
+    output: '<input type="text"/>',
+    errors: [{ message: errInvalid('') }],
+  },
 ];
 
 const requireExplicitInvalid = [