chore: replace immutable with runes in examples to avoid using a deprecated option

Author: dominikg

docs/config.md

@@ -240,9 +240,9 @@ A [picomatch pattern](https://github.com/micromatch/picomatch), or array of patt
     plugins: [
       svelte({
         dynamicCompileOptions({ filename, compileOptions }) {
-          // Dynamically set immutable flag per Svelte file
-          if (compileWithImmutable(filename) && !compileOptions.immutable) {
-            return { immutable: true };
+          // Dynamically set runes mode per Svelte file
+          if (forceRunesMode(filename) && !compileOptions.runes) {
+            return { runes: true };
           }
         }
       })

packages/vite-plugin-svelte/src/public.d.ts

@@ -92,9 +92,9 @@ export interface PluginOptions {
 	 * @example
 	 * ```
 	 * ({ filename, compileOptions }) => {
-	 *   // Dynamically set immutable flag per Svelte file
-	 *   if (compileWithImmutable(filename) && !compileOptions.immutable) {
-	 *     return { immutable: true };
+	 *   // Dynamically set runes mode per Svelte file
+	 *   if (forceRunesMode(filename) && !compileOptions.runes) {
+	 *     return { runes: true };
 	 *   }
 	 * }
 	 * ```

packages/vite-plugin-svelte/types/index.d.ts

@@ -92,9 +92,9 @@ declare module '@sveltejs/vite-plugin-svelte' {
 		 * @example
 		 * ```
 		 * ({ filename, compileOptions }) => {
-		 *   // Dynamically set immutable flag per Svelte file
-		 *   if (compileWithImmutable(filename) && !compileOptions.immutable) {
-		 *     return { immutable: true };
+		 *   // Dynamically set runes mode per Svelte file
+		 *   if (forceRunesMode(filename) && !compileOptions.runes) {
+		 *     return { runes: true };
 		 *   }
 		 * }
 		 * ```