From 23ecd3db29c86c597f9705d43b343a64173c3bac Mon Sep 17 00:00:00 2001
From: yuki0418 <keryuuki0418@gmail.com>
Date: Wed, 1 Oct 2025 09:24:17 +0900
Subject: [PATCH] show an extra bind checked error when a radio type

---
 documentation/docs/03-template-syntax/12-bind.md   |  2 +-
 .../phases/2-analyze/visitors/BindDirective.js     |  2 +-
 .../samples/binding-input-checked/errors.json      |  2 +-
 .../binding-radio-input-checked/errors.json        | 14 ++++++++++++++
 .../binding-radio-input-checked/input.svelte       |  5 +++++
 5 files changed, 22 insertions(+), 3 deletions(-)
 create mode 100644 packages/svelte/tests/validator/samples/binding-radio-input-checked/errors.json
 create mode 100644 packages/svelte/tests/validator/samples/binding-radio-input-checked/input.svelte

diff --git a/documentation/docs/03-template-syntax/12-bind.md b/documentation/docs/03-template-syntax/12-bind.md
index 50e543be66..91bd59665b 100644
--- a/documentation/docs/03-template-syntax/12-bind.md
+++ b/documentation/docs/03-template-syntax/12-bind.md
@@ -95,7 +95,7 @@ Since 5.6.0, if an `<input>` has a `defaultValue` and is part of a form, it will
 
 ## `<input bind:checked>`
 
-Checkbox can be bound with `bind:checked`:
+Checkbox inputs can be bound with `bind:checked`:
 
 ```svelte
 <label>
diff --git a/packages/svelte/src/compiler/phases/2-analyze/visitors/BindDirective.js b/packages/svelte/src/compiler/phases/2-analyze/visitors/BindDirective.js
index 497c4c226d..47aa79c77d 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/visitors/BindDirective.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/visitors/BindDirective.js
@@ -70,7 +70,7 @@ export function BindDirective(node, context) {
 						e.bind_invalid_target(
 							node,
 							node.name,
-							`<input type="checkbox"> - for <input type="radio">, use 'group' binding`
+							`<input type="checkbox">${type?.value[0].data === 'radio' ? ` — for <input type="radio">, use 'group' binding` : ''}`
 						);
 					}
 
diff --git a/packages/svelte/tests/validator/samples/binding-input-checked/errors.json b/packages/svelte/tests/validator/samples/binding-input-checked/errors.json
index ec6437030f..574b25e06f 100644
--- a/packages/svelte/tests/validator/samples/binding-input-checked/errors.json
+++ b/packages/svelte/tests/validator/samples/binding-input-checked/errors.json
@@ -1,7 +1,7 @@
 [
 	{
 		"code": "bind_invalid_target",
-		"message": "`bind:checked` can only be used with <input type=\"checkbox\"> - for <input type=\"radio\">, use 'group' binding",
+		"message": "`bind:checked` can only be used with <input type=\"checkbox\">",
 		"start": {
 			"line": 5,
 			"column": 7
diff --git a/packages/svelte/tests/validator/samples/binding-radio-input-checked/errors.json b/packages/svelte/tests/validator/samples/binding-radio-input-checked/errors.json
new file mode 100644
index 0000000000..53629ce300
--- /dev/null
+++ b/packages/svelte/tests/validator/samples/binding-radio-input-checked/errors.json
@@ -0,0 +1,14 @@
+[
+	{
+		"code": "bind_invalid_target",
+		"message": "`bind:checked` can only be used with <input type=\"checkbox\"> — for <input type=\"radio\">, use 'group' binding",
+		"start": {
+			"line": 5,
+			"column": 20
+		},
+		"end": {
+			"line": 5,
+			"column": 38
+		}
+	}
+]
diff --git a/packages/svelte/tests/validator/samples/binding-radio-input-checked/input.svelte b/packages/svelte/tests/validator/samples/binding-radio-input-checked/input.svelte
new file mode 100644
index 0000000000..67e7b77a3a
--- /dev/null
+++ b/packages/svelte/tests/validator/samples/binding-radio-input-checked/input.svelte
@@ -0,0 +1,5 @@
+<script>
+	let foo;
+</script>
+
+<input type="radio" bind:checked={foo}>
\ No newline at end of file