chore: Upgrade to ESLint 9 (#482)

eslint.config.mjs

@@ -0,0 +1,47 @@
+import prettier from 'eslint-plugin-prettier';
+import _import from 'eslint-plugin-import';
+import globals from 'globals';
+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 [
+  ...compat.extends('eslint:recommended', 'prettier'),
+  {
+    plugins: {
+      prettier,
+      import: _import
+    },
+
+    languageOptions: {
+      globals: {
+        ...globals.node
+      },
+
+      ecmaVersion: 2022,
+      sourceType: 'module'
+    },
+
+    rules: {
+      'no-unused-vars': ['error', { caughtErrors: 'none' }],
+      'prettier/prettier': [
+        'error',
+        {
+          singleQuote: true,
+          printWidth: 120
+        }
+      ],
+
+      'import/no-unresolved': 2
+    }
+  }
+];

lib/featured-slide.js

@@ -1,4 +1,3 @@
-/* eslint-disable no-console */
 import _ from 'lodash';
 import createDebug from 'debug';
 import { getHost, getPort, getOptions, getPuppeteerLaunchConfig } from './config.js';

lib/print.js

@@ -1,4 +1,3 @@
-/* eslint-disable no-console */
 import path from 'node:path';
 import createDebug from 'debug';
 import { getPuppeteerLaunchConfig, getPageOptions, revealBasePath } from './config.js';

lib/server.js

@@ -58,7 +58,7 @@ export default async () => {
 
   const server = app.listen(port);
 
-  console.log(`Reveal-server started at http://${host}:${port}`); // eslint-disable-line no-console
+  console.log(`Reveal-server started at http://${host}:${port}`);
 
   return [server, `http://${host}:${port}/${initialPath}`];
 };

lib/static.js

@@ -1,4 +1,3 @@
-/* eslint-disable no-console */
 import fs from 'fs-extra';
 import path from 'node:path';
 import _ from 'lodash';