feat: support for svelte 5.0.0-next.191 (#550)

Author: ota-meshi

.changeset/chilly-dolls-push.md

@@ -0,0 +1,5 @@
+---
+"svelte-eslint-parser": minor
+---
+
+feat: support for svelte 5.0.0-next.191

package.json

@@ -47,7 +47,7 @@
     "version:ci": "env-cmd -e version-ci pnpm run build:meta && changeset version"
   },
   "peerDependencies": {
-    "svelte": "^3.37.0 || ^4.0.0 || ^5.0.0-next.181"
+    "svelte": "^3.37.0 || ^4.0.0 || ^5.0.0-next.191"
   },
   "peerDependenciesMeta": {
     "svelte": {
@@ -73,11 +73,11 @@
     "@types/eslint-visitor-keys": "^3.3.0",
     "@types/estree": "^1.0.5",
     "@types/mocha": "^10.0.7",
-    "@types/node": "^20.14.10",
+    "@types/node": "^20.14.11",
     "@types/semver": "^7.5.8",
-    "@typescript-eslint/eslint-plugin": "^7.16.0",
-    "@typescript-eslint/parser": "~7.16.0",
-    "@typescript-eslint/types": "~7.16.0",
+    "@typescript-eslint/eslint-plugin": "^7.16.1",
+    "@typescript-eslint/parser": "~7.16.1",
+    "@typescript-eslint/types": "~7.16.1",
     "benchmark": "^2.1.4",
     "chai": "^4.4.1",
     "env-cmd": "^10.1.0",
@@ -90,22 +90,22 @@
     "eslint-plugin-jsonc": "^2.16.0",
     "eslint-plugin-n": "^17.9.0",
     "eslint-plugin-node-dependencies": "^0.12.0",
-    "eslint-plugin-prettier": "^5.1.3",
+    "eslint-plugin-prettier": "^5.2.1",
     "eslint-plugin-regexp": "^2.6.0",
-    "eslint-plugin-svelte": "^2.41.0",
+    "eslint-plugin-svelte": "^2.42.0",
     "eslint-plugin-yml": "^1.14.0",
     "estree-walker": "^3.0.3",
     "locate-character": "^3.0.0",
     "magic-string": "^0.30.10",
     "mocha": "^10.6.0",
     "mocha-chai-jest-snapshot": "^1.1.4",
     "nyc": "^17.0.0",
-    "prettier": "~3.3.2",
+    "prettier": "~3.3.3",
     "prettier-plugin-pkg": "^0.18.1",
-    "prettier-plugin-svelte": "^3.2.5",
-    "rimraf": "^6.0.0",
-    "semver": "^7.6.2",
-    "svelte": "^5.0.0-next.181",
+    "prettier-plugin-svelte": "^3.2.6",
+    "rimraf": "^6.0.1",
+    "semver": "^7.6.3",
+    "svelte": "^5.0.0-next.191",
     "svelte2tsx": "^0.7.13",
     "typescript": "~5.5.3",
     "typescript-eslint-parser-for-extra-files": "^0.7.0"

src/parser/converts/attr.ts

@@ -150,20 +150,10 @@ function convertAttribute(
     ctx.addToken("HTMLIdentifier", keyRange);
     return attribute;
   }
-  const value = node.value as (
-    | Compiler.Text
-    | Compiler.ExpressionTag
-    | SvAST.Text
-    | SvAST.MustacheTag
-    | SvAST.AttributeShorthand
-  )[];
+  const value = node.value;
   const shorthand =
-    value.find((v) => v.type === "AttributeShorthand") ||
-    // for Svelte v5
-    (value.length === 1 &&
-      value[0].type === "ExpressionTag" &&
-      ctx.code[node.start] === "{" &&
-      ctx.code[node.end - 1] === "}");
+    isAttributeShorthandForSvelteV4(value) ||
+    isAttributeShorthandForSvelteV5(value);
   if (shorthand) {
     const key: ESTree.Identifier = {
       ...attribute.key,
@@ -193,34 +183,46 @@ function convertAttribute(
   // Not required for shorthands. Therefore, register the token here.
   ctx.addToken("HTMLIdentifier", keyRange);
 
-  processAttributeValue(
-    node.value as (
-      | SvAST.Text
-      | SvAST.MustacheTag
-      | Compiler.Text
-      | Compiler.ExpressionTag
-    )[],
-    attribute,
-    parent,
-    ctx,
-  );
+  processAttributeValue(value, attribute, parent, ctx);
 
   return attribute;
+
+  function isAttributeShorthandForSvelteV4(
+    value: Exclude<(SvAST.Attribute | Compiler.Attribute)["value"], boolean>,
+  ): value is [SvAST.AttributeShorthand] {
+    return Array.isArray(value) && value[0]?.type === "AttributeShorthand";
+  }
+
+  function isAttributeShorthandForSvelteV5(
+    value: Exclude<
+      (SvAST.Attribute | Compiler.Attribute)["value"],
+      boolean | [SvAST.AttributeShorthand]
+    >,
+  ): boolean {
+    return (
+      !Array.isArray(value) &&
+      value.type === "ExpressionTag" &&
+      ctx.code[node.start] === "{" &&
+      ctx.code[node.end - 1] === "}"
+    );
+  }
 }
 
 /** Common process attribute value */
 function processAttributeValue(
-  nodeValue: (
-    | SvAST.Text
-    | SvAST.MustacheTag
-    | Compiler.Text
-    | Compiler.ExpressionTag
-  )[],
+  nodeValue:
+    | (
+        | SvAST.Text
+        | SvAST.MustacheTag
+        | Compiler.Text
+        | Compiler.ExpressionTag
+      )[]
+    | Compiler.ExpressionTag,
   attribute: SvelteAttribute | SvelteStyleDirectiveLongform,
   attributeParent: (SvelteAttribute | SvelteStyleDirectiveLongform)["parent"],
   ctx: Context,
 ) {
-  const nodes = nodeValue
+  const nodes = (Array.isArray(nodeValue) ? nodeValue : [nodeValue])
     .filter(
       (v) =>
         v.type !== "Text" ||

src/parser/svelte-ast-types.ts

@@ -192,7 +192,7 @@ export interface Comment extends BaseNode {
 export interface Attribute extends BaseNode {
   type: "Attribute";
   name: string;
-  value: (Text | AttributeShorthand | MustacheTag)[] | true;
+  value: (Text | MustacheTag)[] | [AttributeShorthand] | true;
 }
 export interface Spread extends BaseNode {
   type: "Spread";