added support for typescript config files

CHANGELOG.md

@@ -13,6 +13,7 @@ All notable changes to the "prettier-vscode" extension will be documented in thi
 - Fixed parser detection for custom file extensions with config overrides
 - Fixed parser detection fallback when using plugins with Prettier v3
 - Added new Prettier v3 options: `objectWrap`, `experimentalOperatorPosition`
+- Added support for TypeScript config files (`.prettierrc.ts`, `.prettierrc.cts`, `.prettierrc.mts`, `prettier.config.ts`, etc.) introduced in Prettier 3.5.0 - Thanks to [@dr2009](https://github.com/dr2009)
 
 ## [11.0.0]
 

src/PrettierEditService.ts

@@ -47,10 +47,16 @@ const PRETTIER_CONFIG_FILES = [
   ".prettierrc.js",
   ".prettierrc.cjs",
   ".prettierrc.mjs",
+  ".prettierrc.ts",
+  ".prettierrc.cts",
+  ".prettierrc.mts",
   "package.json",
   "prettier.config.js",
   "prettier.config.cjs",
   "prettier.config.mjs",
+  "prettier.config.ts",
+  "prettier.config.cts",
+  "prettier.config.mts",
   ".editorconfig",
 ];
 

src/test/suite/ts-config.test.ts

@@ -0,0 +1,16 @@
+import * as assert from "node:assert";
+import { format, getText } from "./format.test";
+
+describe("TypeScript Config File Support", () => {
+  // This test validates TypeScript config file support added in Prettier 3.5.0
+  // Should use Prettier to read TypeScript config files like prettier.config.ts
+  it("it formats with TypeScript prettier.config.ts", async () => {
+    const { actual } = await format(
+      "ts-config",
+      "index.js",
+      /* shouldRetry */ true,
+    );
+    const expected = await getText("ts-config", "index.result.js");
+    assert.equal(actual, expected);
+  });
+});

test-fixtures/test.code-workspace

@@ -53,6 +53,9 @@
     },
     {
       "path": "esm-config"
+    },
+    {
+      "path": "ts-config"
     }
   ],
   "settings": {

test-fixtures/ts-config/index.js

@@ -0,0 +1,6 @@
+// Test file for TypeScript config
+const example = {foo: "bar", baz: 123, qux: true};
+
+function hello(name) {
+return "Hello, " + name + "!";
+}

test-fixtures/ts-config/index.result.js

@@ -0,0 +1,6 @@
+// Test file for TypeScript config
+const example = { foo: 'bar', baz: 123, qux: true };
+
+function hello(name) {
+    return 'Hello, ' + name + '!';
+}

test-fixtures/ts-config/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "ts-config",
+  "version": "1.0.0",
+  "description": "Test folder for TypeScript config files (Prettier 3.5.0+)",
+  "type": "module",
+  "private": true,
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Prettier",
+  "license": "MIT",
+  "devDependencies": {
+    "prettier": "^3.5.0"
+  },
+  "dependencies": {}
+}

test-fixtures/ts-config/prettier.config.ts

@@ -0,0 +1,10 @@
+// TypeScript config file - requires Prettier 3.5.0+ to parse
+import type { Config } from "prettier";
+
+const config: Config = {
+  tabWidth: 4,
+  singleQuote: true,
+  trailingComma: "es5",
+};
+
+export default config;