fix: compatibility with eslint-plugin-prettier (#612)

Author: ota-meshi

.changeset/perfect-goats-exercise.md

@@ -0,0 +1,5 @@
+---
+"svelte-eslint-parser": patch
+---
+
+fix: compatibility with eslint-plugin-prettier

src/main.ts

@@ -10,8 +10,13 @@ export {
   type StyleContextSuccess,
   type StyleContextUnknownLang,
 } from "./parser/index.js";
-export * as meta from "./meta.js";
 export { name } from "./meta.js";
+// If we use `export * as meta from "./meta.js"`,
+// the structuredClone performed by eslint-plugin-prettier will fail,
+// so we will need to re-export it as a plain object.
+// https://github.com/prettier/eslint-plugin-prettier/blob/b307125faeb58b6dbfd5d8812b2dffcfdc8358df/eslint-plugin-prettier.js#L199
+import * as metaModule from "./meta.js";
+export const meta = { ...metaModule };
 export type { SvelteConfig } from "./svelte-config/index.js";
 
 export { AST, ParseError };

tests/fixtures/integrations/prettier-plugin/prettier.config.cjs

@@ -0,0 +1,3 @@
+module.exports = {
+  plugins: ["prettier-plugin-svelte"],
+};

tests/fixtures/integrations/prettier-plugin/x-input.svelte

@@ -0,0 +1,5 @@
+<script>
+  let value = "Hello";
+</script>
+
+<div>{value}</div>

tests/fixtures/integrations/prettier-plugin/x-output.json

@@ -0,0 +1 @@
+[]

tests/fixtures/integrations/prettier-plugin/x-setup.ts

@@ -0,0 +1,24 @@
+import type { Linter } from "eslint";
+import { generateParserOptions } from "../../../src/parser/test-utils.js";
+import prettier from "eslint-plugin-prettier";
+import * as parser from "../../../../src/index.js";
+import globals from "globals";
+
+export function getConfig(): Linter.Config {
+  return {
+    plugins: {
+      prettier,
+    },
+    languageOptions: {
+      parser,
+      parserOptions: generateParserOptions(),
+      globals: {
+        ...globals.browser,
+        ...globals.es2021,
+      },
+    },
+    rules: {
+      "prettier/prettier": "error",
+    },
+  };
+}

tests/src/meta.ts

@@ -9,6 +9,6 @@ const expectedMeta = {
 
 describe("Test for meta object", () => {
   it("A parser should have a meta object.", () => {
-    assert.deepStrictEqual({ ...parser.meta }, expectedMeta);
+    assert.deepStrictEqual(parser.meta, expectedMeta);
   });
 });