chore(eslint): standardise on flat base + plugin-recommended spread

eslint.config.mjs

@@ -1,13 +1,46 @@
-import nextConfig from 'eslint-config-next/core-web-vitals';
-import nextTypescript from 'eslint-config-next/typescript';
-import prettierConfig from 'eslint-config-prettier';
+import js from '@eslint/js';
+import ts from 'typescript-eslint';
+import nextPlugin from '@next/eslint-plugin-next';
+import reactHooks from 'eslint-plugin-react-hooks';
+import prettier from 'eslint-config-prettier';
+import globals from 'globals';
 
-// eslint-disable-next-line import/no-anonymous-default-export
-export default [
+export default ts.config(
   {
-    ignores: ['.next/**', 'node_modules/**'],
+    ignores: [
+      'node_modules/**',
+      'dist/**',
+      'build/**',
+      'coverage/**',
+      '.next/**',
+    ],
   },
-  ...nextConfig,
-  ...nextTypescript,
-  prettierConfig,
-];
+  js.configs.recommended,
+  ...ts.configs.recommended,
+  {
+    files: ['**/*.{ts,tsx}'],
+    languageOptions: {
+      parser: ts.parser,
+      parserOptions: {
+        ecmaVersion: 'latest',
+        sourceType: 'module',
+        ecmaFeatures: { jsx: true },
+      },
+      globals: { ...globals.browser, ...globals.node, ...globals.es2021 },
+    },
+  },
+  {
+    files: ['**/*.{js,mjs}'],
+    languageOptions: {
+      globals: { ...globals.node, ...globals.es2021 },
+    },
+  },
+  {
+    files: ['**/*.{test,spec}.{ts,tsx,js,mjs}', 'test/**/*.{ts,tsx,js,mjs}'],
+    languageOptions: { globals: { ...globals.jest, ...globals.node } },
+  },
+  nextPlugin.configs.recommended,
+  nextPlugin.configs['core-web-vitals'],
+  reactHooks.configs.flat.recommended,
+  prettier,
+);