build: refine eslint and set up commitlint

.commitlintrc.js

+const fs = require('fs')
+const path = require('path')
+
+const VuepressPackages = fs.readdirSync(path.resolve(__dirname, 'packages/@vuepress'))
+
+module.exports = {
+  extends: [
+    '@commitlint/config-conventional'
+  ],
+  rules: {
+    'scope-enum': [
+      'cli',
+      ...VuepressPackages
+    ].map(name => `$${name}`)
+  }
+}

.eslintignore

 **/node_modules
+!.eslintrc.js
+!.commitlintrc.js
+!.vuepress
 packages/@vuepress/shared-utils/lib
+packages/@vuepress/shared-utils/types

.eslintrc.js

 module.exports = {
   root: true,
   extends: [
-    'plugin:vue-libs/recommended',
-    'plugin:jest/recommended'
+    'plugin:vue-libs/recommended'
   ],
   rules: {
     indent: ['error', 2, { MemberExpression: 'off' }],
-    "no-undef": ["error"],
-    'operator-linebreak': ["error", "before"]
-  }
+    'no-undef': ['error'],
+    'operator-linebreak': ['error', 'before']
+  },
+  overrides: [
+    {
+      files: ['**/__tests__/**/*.spec.js'],
+      extends: ['plugin:jest/recommended']
+    },
+    {
+      files: ['*.ts'],
+      extends: [
+        'plugin:@typescript-eslint/recommended'
+      ],
+      parser: 'vue-eslint-parser',
+      parserOptions: {
+        parser: '@typescript-eslint/parser'
+      }
+    }
+  ]
 }

.lintstagedrc

-{
-  "*.{js,vue}": ["eslint --fix", "git add"]
-}

package.json

 {
   "private": true,
+  "description": "Minimalistic doc generator with Vue component based layout system",
   "workspaces": [
     "packages/@vuepress/*",
     "packages/vuepress",
     "packages/docs"
   ],
-  "description": "Minimalistic doc generator with Vue component based layout system",
   "scripts": {
+    "boot": "node scripts/bootstrap.js",
     "bootstrap": "yarn && yarn tsc",
-    "lerna:bootstrap": "lerna bootstrap",
+    "build": "yarn tsc && yarn build:docs",
+    "build:docs": "yarn workspace docs build",
+    "changelog": "conventional-changelog -p angular -i CHANGELOG.md -s -r 2",
     "clean": "lerna clean && rm -rf node_modules",
-    "packages:list": "lerna ls -l",
-    "packages:diff": "lerna diff",
-    "packages:changed": "lerna changed",
-    "boot": "node scripts/bootstrap.js",
-    "remote-version": "node scripts/remote-version.js",
     "dev": "yarn tsc && yarn dev:docs",
     "dev:docs": "yarn workspace docs dev",
-    "build": "yarn tsc && yarn build:docs",
-    "build:docs": "yarn workspace docs build",
-    "view-info": "yarn tsc && yarn workspace docs view-info",
-    "show-help": "yarn workspace docs show-help",
-    "register-vuepress": "lerna exec --scope vuepress -- yarn link",
+    "lerna:bootstrap": "lerna bootstrap",
     "lint": "yarn lint:check --fix",
     "lint:check": "eslint packages --ext .js,.vue",
+    "packages:changed": "lerna changed",
+    "packages:diff": "lerna diff",
+    "packages:list": "lerna ls -l",
+    "register-vuepress": "lerna exec --scope vuepress -- yarn link",
     "release": "yarn --pure-lockfile && yarn tsc && node scripts/release.js",
-    "unregister-vuepress": "lerna exec --scope vuepress -- yarn unlink",
-    "changelog": "conventional-changelog -p angular -i CHANGELOG.md -s -r 2",
+    "remote-version": "node scripts/remote-version.js",
+    "show-help": "yarn workspace docs show-help",
     "test": "node scripts/test.js",
-    "tsc": "yarn workspace @vuepress/shared-utils tsc"
+    "tsc": "yarn workspace @vuepress/shared-utils tsc",
+    "unregister-vuepress": "lerna exec --scope vuepress -- yarn unlink",
+    "view-info": "yarn tsc && yarn workspace docs view-info"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged"
+    }
+  },
+  "lint-staged": {
+    "*.{js,vue}": [
+      "eslint --fix",
+      "git add"
+    ],
+    "package.json": [
+      "sort-package-json",
+      "git add"
+    ]
   },
   "devDependencies": {
+    "@commitlint/cli": "^8.2.0",
+    "@commitlint/config-conventional": "^8.2.0",
     "@types/escape-html": "^0.0.20",
     "@types/fs-extra": "^5.0.4",
     "@types/globby": "^9.1.0",
@@ -38,21 +55,19 @@
     "@types/lru-cache": "^5.1.0",
     "@types/node": "^12.7.5",
     "@types/semver": "^6.0.0",
-    "conventional-changelog-cli": "^2.0.23",
+    "@typescript-eslint/eslint-plugin": "^2.9.0",
+    "@typescript-eslint/parser": "^2.9.0",
     "all-contributors-cli": "^6.9.1",
-    "eslint": "5.11.1",
-    "eslint-plugin-jest": "^22.17.0",
+    "conventional-changelog-cli": "^2.0.23",
+    "eslint": "^6.7.1",
+    "eslint-plugin-jest": "^23.0.5",
     "eslint-plugin-vue-libs": "^4.0.0",
     "husky": "^3.0.5",
     "inquirer": "^7.0.0",
     "lerna": "3.16.4",
     "lint-staged": "^9.3.0",
     "minimist": "^1.2.0",
+    "sort-package-json": "^1.24.0",
     "typescript": "^3.6.3"
-  },
-  "husky": {
-    "hooks": {
-      "pre-commit": "lint-staged"
-    }
   }
 }

packages/docs/.lintstagedrc

-{
-  "docs/**/*.md": ["yarn lint-md", "git add"]
-}

packages/docs/package.json

 {
-  "private": true,
-  "version": "1.2.0",
   "name": "docs",
+  "version": "1.2.0",
+  "private": true,
   "description": "docs of VuePress",
-  "scripts": {
-    "precommit": "lint-staged",
-    "dev": "vuepress dev docs --temp .temp",
-    "build": "vuepress build docs --temp .temp",
-    "view-info": "vuepress view-info docs --temp .temp",
-    "show-help": "vuepress --help",
-    "lint-md:wording": "textlint ./docs/**/*.md",
-    "lint-md:style": "remark --quiet --frail .",
-    "lint-md": "yarn lint-md:style && yarn lint-md:wording"
+  "keywords": [
+    "documentation",
+    "generator",
+    "vue"
+  ],
+  "homepage": "https://github.com/vuejs/vuepress#readme",
+  "bugs": {
+    "url": "https://github.com/vuejs/vuepress/issues"
   },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/vuejs/vuepress.git"
   },
-  "keywords": [
-    "documentation",
-    "vue",
-    "generator"
-  ],
-  "author": "Evan You",
   "license": "MIT",
-  "bugs": {
-    "url": "https://github.com/vuejs/vuepress/issues"
+  "author": "Evan You",
+  "scripts": {
+    "build": "vuepress build docs --temp .temp",
+    "dev": "vuepress dev docs --temp .temp",
+    "lint-md": "yarn lint-md:style && yarn lint-md:wording",
+    "lint-md:style": "remark --quiet --frail .",
+    "lint-md:wording": "textlint ./docs/**/*.md",
+    "show-help": "vuepress --help",
+    "view-info": "vuepress view-info docs --temp .temp"
   },
-  "homepage": "https://github.com/vuejs/vuepress#readme",
   "devDependencies": {
     "@textlint-rule/textlint-rule-no-unmatched-pair": "^1.0.7",
     "@vuepress/plugin-back-to-top": "^1.2.0",
@@ -35,7 +34,6 @@
     "@vuepress/plugin-medium-zoom": "^1.2.0",
     "@vuepress/plugin-pwa": "^1.2.0",
     "@vuepress/theme-vue": "^1.2.0",
-    "lint-staged": "^8.1.5",
     "remark-cli": "^7.0.0",
     "remark-lint": "^6.0.5",
     "remark-preset-lint-consistent": "^2.0.3",