chore: migrate to flat config

packages/misskey-mahjong/.eslintignore

@@ -1,7 +0,0 @@
-node_modules
-/built
-/coverage
-/.eslintrc.js
-/jest.config.ts
-/test
-/test-d

packages/misskey-mahjong/.eslintrc.cjs

@@ -1,10 +0,0 @@
-module.exports = {
-	root: true,
-	parserOptions: {
-		tsconfigRootDir: __dirname,
-		project: ['./tsconfig.json'],
-	},
-	extends: [
-		'../shared/.eslintrc.js',
-	],
-};

packages/misskey-mahjong/eslint.config.js

@@ -0,0 +1,25 @@
+import tsParser from '@typescript-eslint/parser';
+import sharedConfig from '../shared/eslint.config.js';
+
+export default [
+	...sharedConfig,
+	{
+		ignores: [
+			'**/node_modules',
+			'built',
+			'coverage',
+			'jest.config.ts',
+		],
+	},
+	{
+		files: ['**/*.ts', '**/*.tsx'],
+		languageOptions: {
+			parserOptions: {
+				parser: tsParser,
+				project: ['./tsconfig.json'],
+				sourceType: 'module',
+				tsconfigRootDir: import.meta.dirname,
+			},
+		},
+	},
+];

packages/misskey-mahjong/package.json

@@ -32,7 +32,6 @@
 		"@types/jest": "29.5.12",
 		"@typescript-eslint/eslint-plugin": "6.18.1",
 		"@typescript-eslint/parser": "6.18.1",
-		"eslint": "8.56.0",
 		"nodemon": "3.0.2",
 		"typescript": "5.3.3",
 		"jest": "29.7.0",