feat!: upgrade eslint v8 (fixes #61) (#99)

* feat!: upgrade eslint v8 (fixes #61)

the main change is to replace eslint.CliEngine to eslint.ESLint, as CLIEngine
has been removed.

refs: https://eslint.org/docs/8.0.0/user-guide/migrating-to-8.0.0#remove-cliengine

* fix: upgrade eslint-config-react-app

forked eslint-config-react-app v7.0.0, as it was breaking `dts lint`

.eslintignore

@@ -1,3 +1,5 @@
 /node_modules/
 dist/
 /docs
+# fixtures/
+/conf/eslint-config-react-app/

.vscode/launch.json

@@ -0,0 +1,33 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch via NPM",
+            "request": "launch",
+            "runtimeArgs": [
+                "run-script",
+                "lint:post-build"
+            ],
+            "runtimeExecutable": "npm",
+            "skipFiles": [
+                "<node_internals>/**"
+            ],
+            "type": "pwa-node"
+        },
+        {
+            "type": "pwa-node",
+            "request": "launch",
+            "name": "Launch Program",
+            "skipFiles": [
+                "<node_internals>/**"
+            ],
+            "program": "${workspaceFolder}/node_modules/@rushstack/eslint-patch/lib/modern-module-resolution.js",
+            "outFiles": [
+                "${workspaceFolder}/**/*.js"
+            ]
+        }
+    ]
+}

README.md

@@ -24,6 +24,7 @@ Despite all the recent hype, setting up a new TypeScript (x React) library can b
 <!-- START doctoc generated TOC please keep comment here to allow auto update -->
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
 
+
 - [Features](#features)
 - [Quick Start](#quick-start)
   - [`npm start` or `yarn start`](#npm-start-or-yarn-start)

conf/eslint-config-react-app/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2013-present, Facebook, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

conf/eslint-config-react-app/README.md

@@ -0,0 +1,6 @@
+# eslint-config-react-app
+
+forked from eslint-config-react-app. the main changes:
+
+* removed @rushstack/eslint-patch, as it was breaking `dts lint`.
+* removed @babel/eslint-parser.

conf/eslint-config-react-app/base.js

@@ -0,0 +1,51 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+'use strict';
+
+// removed it as it was breaking `dts lint`
+// Fix eslint shareable config (https://github.com/eslint/eslint/issues/3458)
+// require('@rushstack/eslint-patch/modern-module-resolution');
+
+// This file contains the minimum ESLint configuration required for Create
+// React App support, and is used as the `baseConfig` for `eslint-loader`
+// to ensure that user-provided configs don't need this boilerplate.
+
+module.exports = {
+  root: true,
+
+  // parser: '@babel/eslint-parser',
+
+  plugins: ['react'],
+
+  env: {
+    browser: true,
+    commonjs: true,
+    es6: true,
+    jest: true,
+    node: true,
+  },
+
+  parserOptions: {
+    sourceType: 'module',
+    ecmaVersion: 'latest',
+    ecmaFeatures: {
+      jsx: true
+    }
+  },
+
+  settings: {
+    react: {
+      version: 'detect',
+    },
+  },
+
+  rules: {
+    'react/jsx-uses-vars': 'warn',
+    'react/jsx-uses-react': 'warn',
+  },
+};