Upgrade ESLint and Prettier

DEPENDENCY-NOTES.md

@@ -3,7 +3,6 @@ As of 2024 June 17:
 The `npm outdated` command reports some dependencies as outdated. They are not being updated at this time for the reasons given below:
 
 - `chalk`: major version 5 causes problems for jest. Keep updated to latest 4.x release.
-- `eslint`: version 8.57.0 is the newest version supported by `@typescript-eslint` packages. Update this package when the `@typescript-eslint` packages' support is updated.
 - `html-minifier-terser`: major version 6 changes the functions we use to become async, which would require changing more or less the entirety of SUSHI's export functions to async.
 - `junk`: major version 4 is an esmodule.
 - `title-case`: major version 4 is an esmodule.

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'
+    }
+  }
+];