Migrate to eslint flat config

apps/legacy-importer/eslint.config.mjs

@@ -1,13 +1,3 @@
-import path from 'node:path';
-import { fileURLToPath } from 'node:url';
-import js from '@eslint/js';
-import { FlatCompat } from '@eslint/eslintrc';
+import config from '@gw2treasures/eslint-config';
 
-const __filename = fileURLToPath(import.meta.url);
-const __dirname = path.dirname(__filename);
-const compat = new FlatCompat({
-  baseDirectory: __dirname,
-  recommendedConfig: js.configs.recommended,
-  allConfig: js.configs.all
-});
-export default [...compat.extends('@gw2treasures/eslint-config')];
+export default config;

apps/legacy-importer/package.json

@@ -13,8 +13,6 @@
     "gw2-api-types": "0.0.8"
   },
   "devDependencies": {
-    "@eslint/eslintrc": "3.2.0",
-    "@eslint/js": "9.16.0",
     "@gw2treasures/eslint-config": "workspace:*",
     "@gw2treasures/tsconfig": "workspace:*",
     "@types/node": "22.10.1",

apps/web/eslint.config.mjs

@@ -1,4 +1,5 @@
 import nextJsPlugin from '@gw2treasures/eslint-plugin-nextjs';
+import reactConfig from '@gw2treasures/eslint-config/react';
 import reactCompiler from 'eslint-plugin-react-compiler';
 import js from '@eslint/js';
 import tseslint from 'typescript-eslint';
@@ -12,7 +13,8 @@ const compat = new FlatCompat({
 
 export default tseslint.config(
   { ignores: ['.next'] },
-  ...compat.extends('next/core-web-vitals', '@gw2treasures/eslint-config/react'),
+  ...compat.extends('next/core-web-vitals'),
+  ...reactConfig,
   {
     plugins: {
       '@gw2treasures/nextjs': nextJsPlugin,

apps/worker/eslint.config.mjs

@@ -1,13 +1,3 @@
-import path from 'node:path';
-import { fileURLToPath } from 'node:url';
-import js from '@eslint/js';
-import { FlatCompat } from '@eslint/eslintrc';
+import config from '@gw2treasures/eslint-config';
 
-const __filename = fileURLToPath(import.meta.url);
-const __dirname = path.dirname(__filename);
-const compat = new FlatCompat({
-  baseDirectory: __dirname,
-  recommendedConfig: js.configs.recommended,
-  allConfig: js.configs.all
-});
-export default [...compat.extends('@gw2treasures/eslint-config')];
+export default config;

apps/worker/package.json

@@ -24,14 +24,11 @@
     "sharp": "0.33.5"
   },
   "devDependencies": {
-    "@eslint/eslintrc": "3.2.0",
-    "@eslint/js": "9.16.0",
     "@gw2api/types": "0.0.22",
     "@gw2treasures/eslint-config": "workspace:*",
     "@gw2treasures/tsconfig": "workspace:*",
     "@types/jest": "29.5.14",
     "@types/node": "22.10.1",
-    "@typescript-eslint/parser": "8.17.0",
     "@vercel/ncc": "0.38.3",
     "eslint": "9.16.0",
     "jest": "29.7.0",

packages/eslint-config/configs/index.mjs

@@ -0,0 +1,85 @@
+import js from "@eslint/js";
+import ts from 'typescript-eslint';
+import importPlugin from 'eslint-plugin-import';
+import stylistic from '@stylistic/eslint-plugin'
+
+export default ts.config(
+  js.configs.recommended,
+  ts.configs.recommended,
+  importPlugin.flatConfigs.recommended,
+  importPlugin.flatConfigs.typescript,
+  {
+    languageOptions: {
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+    },
+    plugins: {
+      '@stylistic': stylistic
+    },
+    rules: {
+      // `"foo"` → `'foo'`
+      "@stylistic/quotes": ["warn", "single"],
+
+      // `a => a` → `(a) => a`
+      "@stylistic/arrow-parens": "warn",
+
+      // `(a)=>a` → `(a) => a`
+      "@stylistic/arrow-spacing": "warn",
+
+      // `foo( bar )` → `foo(bar)`
+      "@stylistic/space-in-parens": "warn",
+
+      // disallows multipe spaces
+      "@stylistic/no-multi-spaces": "warn",
+
+      // disallow multiple empty lines
+      "@stylistic/no-multiple-empty-lines": "warn",
+
+      // only 1 property per line for objects (enforced only for > 3 properties or multiline values)
+      "@stylistic/object-curly-newline": ["warn", { "multiline": true, "consistent": true }],
+
+      // `{foo: bar}` → `{ foo: bar }`
+      "@stylistic/object-curly-spacing": ["warn", "always", { "objectsInObjects": false }],
+
+      // `{ foo:bar }` → `{ foo: bar }`
+      "@stylistic/key-spacing": "warn",
+
+      // `{ x: x }` → `{ x }`
+      "object-shorthand": "warn",
+
+      // allows (but does not require) dangling commas in multiline
+      "@stylistic/comma-dangle": ["warn", "only-multiline"],
+
+      // `foo(bar,baz)` → `foo(bar, baz)`
+      "@stylistic/comma-spacing": "warn",
+
+      // `1+1` → `1 + 1`
+      "@stylistic/space-infix-ops": "warn",
+
+      // require semicolon
+      "@stylistic/semi": "warn",
+
+      // no unnecessary semicolon
+      "@stylistic/no-extra-semi": ["warn"],
+
+      // disallows async functions not using await
+      "require-await": "warn",
+
+      // require dependencies to be in package.json
+      "import/no-extraneous-dependencies": "error",
+
+      // disable import/no-unresolved, ts is already handling this
+      "import/no-unresolved": "off",
+
+      // `const foo:Bar` → `const foo: Bar`
+      "@stylistic/type-annotation-spacing": "warn",
+
+      // `class foo_bar` → `class FooBar`
+      "@typescript-eslint/naming-convention": [
+        "warn",
+        { "selector": "default", "format": null },
+        { "selector": "typeLike", "format": ["PascalCase"] }
+      ]
+    }
+  }
+);