Upgrade ESLint and Prettier

ESLint is a major update which required a new configuration file format as well as using an 8.0.0 alpha version of @typescript-eslint.

Also fixed all violations reported by updated ESLint and Prettier.

eslint.config.mjs

@@ -0,0 +1,54 @@
+import tsParser from '@typescript-eslint/parser';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import js from '@eslint/js';
+import { FlatCompat } from '@eslint/eslintrc';
+
+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 [
+  {
+    ignores: [
+      'dist/*',
+      'coverage/*',
+      'build*/*',
+      '**/*.d.ts',
+      'src/public/',
+      'src/types/',
+      'regression/output*',
+      '**/generated'
+    ]
+  },
+  ...compat.extends('plugin:@typescript-eslint/recommended', 'prettier'),
+  {
+    languageOptions: {
+      parser: tsParser,
+      ecmaVersion: 2018,
+      sourceType: 'module'
+    },
+
+    rules: {
+      semi: ['error', 'always'],
+
+      quotes: [
+        'error',
+        'single',
+        {
+          avoidEscape: true
+        }
+      ],
+
+      '@typescript-eslint/ban-ts-comment': 'off',
+      '@typescript-eslint/explicit-function-return-type': 'off',
+      '@typescript-eslint/no-empty-function': 'off',
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-unsafe-declaration-merging': 'off'
+    }
+  }
+];