New: Add eslint-plugin-eslint-plugin to plugin generator (#79)

We want to encourage the adoption of [eslint-plugin-eslint-plugin](https://www.npmjs.com/package/eslint-plugin-eslint-plugin) to help ESLint plugin authors follow best practices including avoiding using deprecated APIs and producing rules with good usability.

plugin/index.js

@@ -79,6 +79,7 @@ ESLintPluginGenerator.prototype.generate = function generate() {
     mkdirp.sync("lib");
     mkdirp.sync("tests");
     mkdirp.sync("tests/lib");
+    this.template("_.eslintrc.js", ".eslintrc.js");
     this.template("_plugin.js", "lib/index.js");
     this.template("_package.json", "package.json");
     this.template("_README.md", "README.md");

plugin/templates/_.eslintrc.js

@@ -0,0 +1,18 @@
+'use strict';
+
+module.exports = {
+  root: true,
+  extends: [
+    'eslint:recommended',
+    'plugin:eslint-plugin/recommended',
+  ],
+  env: {
+    node: true,
+  },
+  overrides: [
+    {
+      files: ['tests/**/*.js'],
+      env: { mocha: true },
+    },
+  ]
+};

plugin/templates/_package.json

@@ -10,13 +10,15 @@
   "author": "<%- userName.replace(/"/g, '\\"') %>",
   "main": "lib/index.js",
   "scripts": {
+    "lint": "eslint .",
     "test": "mocha tests --recursive"
   },
   "dependencies": {
     "requireindex": "~1.1.0"
   },
   "devDependencies": {
     "eslint": "^7.1.0",
+    "eslint-plugin-eslint-plugin": "^3.2.0",
     "mocha": "^9.0.0"
   },
   "engines": {