feat: Support latest runes (#534)

Author: baseballyama

.changeset/polite-ears-move.md

@@ -0,0 +1,5 @@
+---
+"svelte-eslint-parser": minor
+---
+
+feat: support Svelte 5.0.0-next.155. (Add `$state.is` and replace `$effect.active` with `$effect.tracking`)

src/parser/typescript/analyze/index.ts

@@ -319,7 +319,7 @@ function analyzeRuneVariables(
       continue;
     }
     switch (globalName) {
-      // See https://github.com/sveltejs/svelte/blob/bda32edb1a4f2d383d96071750d6bfa9421b2175/packages/svelte/types/index.d.ts#L2585
+      // See https://github.com/sveltejs/svelte/blob/ccb3c90cd57ca9d764efab317ed1cb8e5282926e/packages/svelte/types/index.d.ts#L2646
       case "$state": {
         appendDeclareFunctionVirtualScripts(globalName, [
           "<T>(initial: T): T",
@@ -332,9 +332,12 @@ function analyzeRuneVariables(
         appendDeclareNamespaceVirtualScripts(globalName, [
           "export function snapshot<T>(state: T): T;",
         ]);
+        appendDeclareNamespaceVirtualScripts(globalName, [
+          "export function is(a: any, b: any): boolean;",
+        ]);
         break;
       }
-      // See https://github.com/sveltejs/svelte/blob/bda32edb1a4f2d383d96071750d6bfa9421b2175/packages/svelte/types/index.d.ts#L2648
+      // See https://github.com/sveltejs/svelte/blob/ccb3c90cd57ca9d764efab317ed1cb8e5282926e/packages/svelte/types/index.d.ts#L2751
       case "$derived": {
         appendDeclareFunctionVirtualScripts(globalName, [
           "<T>(expression: T): T",
@@ -344,36 +347,36 @@ function analyzeRuneVariables(
         ]);
         break;
       }
-      // See https://github.com/sveltejs/svelte/blob/bda32edb1a4f2d383d96071750d6bfa9421b2175/packages/svelte/types/index.d.ts#L2687
+      // See https://github.com/sveltejs/svelte/blob/ccb3c90cd57ca9d764efab317ed1cb8e5282926e/packages/svelte/types/index.d.ts#L2811
       case "$effect": {
         appendDeclareFunctionVirtualScripts(globalName, [
           "(fn: () => void | (() => void)): void",
         ]);
         appendDeclareNamespaceVirtualScripts(globalName, [
           "export function pre(fn: () => void | (() => void)): void;",
-          "export function active(): boolean;",
+          "export function tracking(): boolean;",
           "export function root(fn: () => void | (() => void)): () => void;",
         ]);
         break;
       }
-      // See https://github.com/sveltejs/svelte/blob/bda32edb1a4f2d383d96071750d6bfa9421b2175/packages/svelte/types/index.d.ts#L2768
+      // See https://github.com/sveltejs/svelte/blob/ccb3c90cd57ca9d764efab317ed1cb8e5282926e/packages/svelte/types/index.d.ts#L2913
       case "$props": {
         appendDeclareFunctionVirtualScripts(globalName, ["(): any"]);
         break;
       }
-      // See https://github.com/sveltejs/svelte/blob/bda32edb1a4f2d383d96071750d6bfa9421b2175/packages/svelte/types/index.d.ts#L2779
+      // See https://github.com/sveltejs/svelte/blob/ccb3c90cd57ca9d764efab317ed1cb8e5282926e/packages/svelte/types/index.d.ts#L2924
       case "$bindable": {
         appendDeclareFunctionVirtualScripts(globalName, ["<T>(t?: T): T"]);
         break;
       }
-      // See https://github.com/sveltejs/svelte/blob/bda32edb1a4f2d383d96071750d6bfa9421b2175/packages/svelte/types/index.d.ts#L2799
+      // See https://github.com/sveltejs/svelte/blob/ccb3c90cd57ca9d764efab317ed1cb8e5282926e/packages/svelte/types/index.d.ts#L2944
       case "$inspect": {
         appendDeclareFunctionVirtualScripts(globalName, [
           `<T extends any[]>(...values: T): { with: (fn: (type: 'init' | 'update', ...values: T) => void) => void }`,
         ]);
         break;
       }
-      // See https://github.com/sveltejs/svelte/blob/bda32edb1a4f2d383d96071750d6bfa9421b2175/packages/svelte/types/index.d.ts#L2822
+      // See https://github.com/sveltejs/svelte/blob/ccb3c90cd57ca9d764efab317ed1cb8e5282926e/packages/svelte/types/index.d.ts#L2967
       case "$host": {
         appendDeclareFunctionVirtualScripts(globalName, [
           `<El extends HTMLElement = HTMLElement>(): El`,

tests/fixtures/parser/ast/svelte5/docs/runes/01-$state-input.svelte

@@ -1,7 +1,7 @@
 <script>
-	let count = $state(0);
+  let count = $state(0);
 </script>
 
-<button on:click={() => count++}>
-	clicks: {count}
+<button on:click="{() => count++}">
+  clicks: {count}
 </button>

tests/fixtures/parser/ast/svelte5/docs/runes/01-$state-is-input.svelte

@@ -0,0 +1,9 @@
+<script>
+  let foo = $state({});
+  let bar = {};
+
+  foo.bar = bar;
+
+  console.log(foo.bar === bar); // false — `foo.bar` is a reactive proxy
+  console.log($state.is(foo.bar, bar)); // true
+</script>