Sync svelte docs (sveltejs#959)

sync svelte docs

Co-authored-by: Rich-Harris <[email protected]>

Author: github-actions[bot]

apps/svelte.dev/content/docs/svelte/03-template-syntax/11-bind.md

@@ -12,10 +12,34 @@ The general syntax is `bind:property={expression}`, where `expression` is an _lv
 <input bind:value />
 ```
 
+
 Svelte creates an event listener that updates the bound value. If an element already has a listener for the same event, that listener will be fired before the bound value is updated.
 
 Most bindings are _two-way_, meaning that changes to the value will affect the element and vice versa. A few bindings are _readonly_, meaning that changing their value will have no effect on the element.
 
+## Function bindings
+
+You can also use `bind:property={get, set}`, where `get` and `set` are functions, allowing you to perform validation and transformation:
+
+```svelte
+<input bind:value={
+	() => value,
+	(v) => value = v.toLowerCase()}
+/>
+```
+
+In the case of readonly bindings like [dimension bindings](#Dimensions), the `get` value should be `null`:
+
+```svelte
+<div
+	bind:clientWidth={null, redraw}
+	bind:clientHeight={null, redraw}
+>...</div>
+```
+
+> [!NOTE]
+> Function bindings are available in Svelte 5.9.0 and newer.
+
 ## `<input bind:value>`
 
 A `bind:value` directive on an `<input>` element binds the input's `value` property:

apps/svelte.dev/content/docs/svelte/98-reference/.generated/compile-errors.md

@@ -78,10 +78,16 @@ Sequence expressions are not allowed as attribute/directive values in runes mode
 Attribute values containing `{...}` must be enclosed in quote marks, unless the value only contains the expression
 ```
 
+### bind_group_invalid_expression
+
+```
+`bind:group` can only bind to an Identifier or MemberExpression
+```
+
 ### bind_invalid_expression
 
 ```
-Can only bind to an Identifier or MemberExpression
+Can only bind to an Identifier or MemberExpression or a `{get, set}` pair
 ```
 
 ### bind_invalid_name
@@ -94,6 +100,12 @@ Can only bind to an Identifier or MemberExpression
 `bind:%name%` is not a valid binding. %explanation%
 ```
 
+### bind_invalid_parens
+
+```
+`bind:%name%={get, set}` must not have surrounding parentheses
+```
+
 ### bind_invalid_target
 
 ```

apps/svelte.dev/content/docs/svelte/98-reference/21-svelte-compiler.md

@@ -320,7 +320,10 @@ namespace AST {
 		/** The 'x' in `bind:x` */
 		name: string;
 		/** The y in `bind:x={y}` */
-		expression: Identifier | MemberExpression;
+		expression:
+			| Identifier
+			| MemberExpression
+			| SequenceExpression;
 	}
 
 	/** A `class:` directive */

apps/svelte.dev/content/docs/svelte/98-reference/30-compiler-errors.md

@@ -82,10 +82,16 @@ Sequence expressions are not allowed as attribute/directive values in runes mode
 Attribute values containing `{...}` must be enclosed in quote marks, unless the value only contains the expression
 ```
 
+### bind_group_invalid_expression
+
+```
+`bind:group` can only bind to an Identifier or MemberExpression
+```
+
 ### bind_invalid_expression
 
 ```
-Can only bind to an Identifier or MemberExpression
+Can only bind to an Identifier or MemberExpression or a `{get, set}` pair
 ```
 
 ### bind_invalid_name
@@ -98,6 +104,12 @@ Can only bind to an Identifier or MemberExpression
 `bind:%name%` is not a valid binding. %explanation%
 ```
 
+### bind_invalid_parens
+
+```
+`bind:%name%={get, set}` must not have surrounding parentheses
+```
+
 ### bind_invalid_target
 
 ```