feat: bump to eslint v9 (#803)

Author: alcpereira

.eslintrc.cjs

@@ -62,7 +62,7 @@ tests/typings/dist
 
 build
 /*.js
-!.eslintrc.cjs
+!eslint.config.js
 .idea/
 .DS_Store
 *.tsbuildinfo

.gitignore

@@ -0,0 +1,52 @@
+// @ts-check
+import eslintPluginUnicorn from 'eslint-plugin-unicorn'
+import eslint from '@eslint/js'
+import tseslint from 'typescript-eslint'
+import globals from 'globals'
+import importPlugin from 'eslint-plugin-import'
+
+export default tseslint.config(
+    eslint.configs.recommended,
+    ...tseslint.configs.recommended,
+    importPlugin.flatConfigs.errors,
+    importPlugin.flatConfigs.warnings,
+    {
+        plugins: {
+            unicorn: eslintPluginUnicorn,
+        },
+        languageOptions: {
+            globals: {
+                ...globals.node,
+                ...globals.es5,
+                ...globals.jest,
+            },
+            ecmaVersion: 2019,
+            sourceType: 'module',
+        },
+        rules: {
+            semi: ['error', 'never'],
+            quotes: ['error', 'single'],
+            indent: [2, 4],
+
+            'no-constant-condition': 0,
+            // see https://stackoverflow.com/questions/55280555/typescript-eslint-eslint-plugin-error-route-is-defined-but-never-used-no-un
+            'no-unused-vars': 'off',
+            '@typescript-eslint/no-unused-vars': 'error',
+
+            'import/no-unresolved': 0,
+            'import/named': 2,
+            'import/namespace': 2,
+            'import/default': 2,
+            'import/export': 2,
+
+            'unicorn/prefer-node-protocol': 'error',
+        },
+        ignores: ['./build/*'],
+    },
+    {
+        files: ['*.ts'],
+        rules: {
+            'no-undef': 'off',
+        },
+    },
+)