🛠️ [Eslint] Flat config (#54)

.changeset/odd-goats-deliver.md

@@ -0,0 +1,5 @@
+---
+'emitten': patch
+---
+
+Switch to eslint flat config.

.nvmrc

@@ -1 +1 @@
-20.12
+20.13

.vscode/settings.json

@@ -5,7 +5,8 @@
   "editor.formatOnSave": true,
   "editor.defaultFormatter": "esbenp.prettier-vscode",
   "eslint.validate": ["javascript", "typescript"],
-  "stylelint.enable": true,
+  "eslint.experimental.useFlatConfig": true,
+  "eslint.useFlatConfig": true,
   "typescript.tsdk": "./node_modules/typescript/lib",
   "typescript.enablePromptUseWorkspaceTsdk": true,
   "files.exclude": {

eslint.config.mjs

@@ -0,0 +1,33 @@
+import globals from 'globals';
+import configLove from 'eslint-config-love';
+// Includes both `config` and `plugin`.
+import pluginPrettier from 'eslint-plugin-prettier/recommended';
+
+export default [
+  {
+    ignores: ['coverage/**', 'dist/**'],
+  },
+  configLove,
+  pluginPrettier,
+  {
+    name: 'custom-rules',
+    files: ['**/*.ts', '**/*.js', '**/*.mjs'],
+    languageOptions: {
+      ...configLove.languageOptions,
+      globals: {
+        ...globals.browser,
+      },
+      ecmaVersion: 2022,
+      sourceType: 'module',
+    },
+    rules: {
+      'no-console': 'warn',
+      '@typescript-eslint/explicit-function-return-type': 'off',
+      // '@typescript-eslint/strict-boolean-expressions': 'off',
+      '@typescript-eslint/consistent-indexed-object-style': [
+        'error',
+        'index-signature',
+      ],
+    },
+  },
+];