fix: mark accessors and immutable as deprecated

Author: Rich-Harris

.changeset/tiny-meals-deliver.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: mark `accessors` and `immutable` as deprecated

packages/svelte/src/compiler/types/index.d.ts

@@ -94,6 +94,7 @@ export interface CompileOptions extends ModuleCompileOptions {
 	 * If `true`, getters and setters will be created for the component's props. If `false`, they will only be created for readonly exported values (i.e. those declared with `const`, `class` and `function`). If compiling with `customElement: true` this option defaults to `true`.
 	 *
 	 * @default false
+	 * @deprecated This will have no effect in runes mode
 	 */
 	accessors?: boolean;
 	/**
@@ -107,6 +108,7 @@ export interface CompileOptions extends ModuleCompileOptions {
 	 * This allows it to be less conservative about checking whether values have changed.
 	 *
 	 * @default false
+	 * @deprecated This will have no effect in runes mode
 	 */
 	immutable?: boolean;
 	/**

packages/svelte/src/compiler/validate-options.js

@@ -40,7 +40,10 @@ export const validate_component_options =
 		object({
 			...common,
 
-			accessors: boolean(false),
+			accessors: deprecate(
+				'The accessors option has been deprecated. It will have no effect in runes mode.',
+				boolean(false)
+			),
 
 			css: validator('external', (input) => {
 				if (input === true || input === false) {
@@ -73,7 +76,7 @@ export const validate_component_options =
 			discloseVersion: boolean(true),
 
 			immutable: deprecate(
-				'The immutable option has been deprecated. It has no effect in runes mode.',
+				'The immutable option has been deprecated. It will have no effect in runes mode.',
 				boolean(false)
 			),
 

packages/svelte/types/index.d.ts

@@ -585,6 +585,7 @@ declare module 'svelte/compiler' {
 		 * If `true`, getters and setters will be created for the component's props. If `false`, they will only be created for readonly exported values (i.e. those declared with `const`, `class` and `function`). If compiling with `customElement: true` this option defaults to `true`.
 		 *
 		 * @default false
+		 * @deprecated This will have no effect in runes mode
 		 */
 		accessors?: boolean;
 		/**
@@ -598,6 +599,7 @@ declare module 'svelte/compiler' {
 		 * This allows it to be less conservative about checking whether values have changed.
 		 *
 		 * @default false
+		 * @deprecated This will have no effect in runes mode
 		 */
 		immutable?: boolean;
 		/**
@@ -2395,6 +2397,7 @@ declare module 'svelte/types/compiler/interfaces' {
 		 * If `true`, getters and setters will be created for the component's props. If `false`, they will only be created for readonly exported values (i.e. those declared with `const`, `class` and `function`). If compiling with `customElement: true` this option defaults to `true`.
 		 *
 		 * @default false
+		 * @deprecated This will have no effect in runes mode
 		 */
 		accessors?: boolean;
 		/**
@@ -2408,6 +2411,7 @@ declare module 'svelte/types/compiler/interfaces' {
 		 * This allows it to be less conservative about checking whether values have changed.
 		 *
 		 * @default false
+		 * @deprecated This will have no effect in runes mode
 		 */
 		immutable?: boolean;
 		/**