From 332d1a89f6224937043751d0ad6c7a90174ff9a8 Mon Sep 17 00:00:00 2001
From: Ian VanSchooten <ian.vanschooten@gmail.com>
Date: Tue, 19 Mar 2024 09:52:58 -0400
Subject: [PATCH] Convert eslint to flat config

---
 .eslintrc.js          | 24 ------------------------
 .vscode/settings.json |  3 +++
 eslint.config.mjs     | 28 ++++++++++++++++++++++++++++
 index.test.mjs        |  2 +-
 package.json          |  1 +
 pnpm-lock.yaml        |  3 +++
 6 files changed, 36 insertions(+), 25 deletions(-)
 delete mode 100644 .eslintrc.js
 create mode 100644 .vscode/settings.json
 create mode 100644 eslint.config.mjs

diff --git a/.eslintrc.js b/.eslintrc.js
deleted file mode 100644
index 1e4629f..0000000
--- a/.eslintrc.js
+++ /dev/null
@@ -1,24 +0,0 @@
-module.exports = {
-  parserOptions: {
-    ecmaVersion: 2022,
-  },
-  env: {
-    node: true,
-    es6: true,
-  },
-  plugins: ["no-only-tests"],
-  extends: ["eslint:recommended"],
-  overrides: [
-    {
-      files: "*.mjs",
-      parserOptions: {
-        sourceType: "module",
-      },
-    },
-    // Prevent .only in tests
-    {
-      files: ["src/**/*.test.{ts,tsx}"],
-      rules: { "no-only-tests/no-only-tests": "error" },
-    },
-  ],
-};
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..eb8204b
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+  "eslint.experimental.useFlatConfig": true
+}
diff --git a/eslint.config.mjs b/eslint.config.mjs
new file mode 100644
index 0000000..79c79ba
--- /dev/null
+++ b/eslint.config.mjs
@@ -0,0 +1,28 @@
+import noOnlyPlugin from "eslint-plugin-no-only-tests";
+import eslint from "@eslint/js";
+
+export default [
+  eslint.configs.recommended,
+  {
+    rules: {
+      semi: "error",
+      "prefer-const": "error",
+    },
+  },
+  {
+    files: ["**/*.js"],
+    languageOptions: {
+      globals: {
+        require: "readonly",
+        module: "readonly",
+      },
+    },
+  },
+  // Prevent .only in tests
+  {
+    plugins: {
+      "no-only-tests": noOnlyPlugin,
+    },
+    rules: { "no-only-tests/no-only-tests": "error" },
+  },
+];
diff --git a/index.test.mjs b/index.test.mjs
index 679915b..437517e 100644
--- a/index.test.mjs
+++ b/index.test.mjs
@@ -12,7 +12,7 @@ function format(css) {
 }
 
 async function run(input, output, opts, postcssOpts = {}) {
-  let result = await postcss([plugin(opts)]).process(input, postcssOpts);
+  const result = await postcss([plugin(opts)]).process(input, postcssOpts);
   expect(format(result.css)).toEqual(format(output));
   expect(result.warnings()).toHaveLength(0);
 }
diff --git a/package.json b/package.json
index f625264..a2c4a3f 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,7 @@
     "postcss": "^8.3.0"
   },
   "devDependencies": {
+    "@eslint/js": "^8.57.0",
     "c8": "^7.11.3",
     "clean-publish": "^3.4.2",
     "eslint": "^8.57.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index fe497dc..69f1bd6 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -10,6 +10,9 @@ dependencies:
     version: 4.2.1
 
 devDependencies:
+  '@eslint/js':
+    specifier: ^8.57.0
+    version: 8.57.0
   c8:
     specifier: ^7.11.3
     version: 7.14.0