Update eslint config

eslint.config.js

@@ -0,0 +1,35 @@
+import js from '@eslint/js';
+import stylistic from '@stylistic/eslint-plugin';
+import globals from 'globals';
+
+export default [
+  {
+    name: 'jonnybarnes-uk-config',
+    languageOptions: {
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+      globals: {
+        ...globals.browser
+      }
+    },
+    linterOptions: {
+      reportUnusedDisableDirectives: 'error'
+    },
+    plugins: {
+      '@stylistic': stylistic
+    },
+    rules: {
+      ...js.configs.recommended.rules,
+      '@stylistic/indent': ['error', 2],
+      '@stylistic/linebreak-style': ['error', 'unix'],
+      '@stylistic/quotes': ['error', 'single'],
+      '@stylistic/semi': ['error', 'always'],
+      'no-console': ['error', { allow: ['warn', 'error'] }],
+      'no-await-in-loop': 'error',
+      'no-promise-executor-return': 'error',
+      'require-atomic-updates': 'error',
+      'max-nested-callbacks': ['error', 3],
+      'prefer-promise-reject-errors': 'error',
+    },
+  }
+];