Update eslint

backend/eslint.config.mjs

@@ -0,0 +1,41 @@
+// @ts-check
+
+import eslint from '@eslint/js';
+import { defineConfig } from 'eslint/config';
+import tseslint from 'typescript-eslint';
+import globals from 'globals';
+import stylistic from '@stylistic/eslint-plugin';
+import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
+
+export default defineConfig(
+	{
+		languageOptions: {
+			globals: globals['shared-node-browser'],
+			parserOptions: {
+				projectService: true,
+				tsconfigRootDir: import.meta.dirname,
+			},
+		},
+	},
+	{
+		extends: [
+			eslint.configs.recommended,
+			...tseslint.configs.recommended,
+			...tseslint.configs.stylistic,
+		],
+		plugins: {
+			'@stylistic': stylistic,
+		},
+		rules: {
+			'quotes': [
+				'error',
+				'single'
+			],
+			'semi': [
+				'error',
+				'always'
+			]
+		},
+	},
+	eslintPluginPrettierRecommended,
+);