Setup eslint, prettier & husky (#72)

.eslintrc.js

@@ -0,0 +1,16 @@
+module.exports = {
+  env: {
+    browser: true,
+    commonjs: true,
+    es6: true
+  },
+  extends: "standard",
+  globals: {
+    Atomics: "readonly",
+    SharedArrayBuffer: "readonly"
+  },
+  parserOptions: {
+    ecmaVersion: 2018
+  },
+  rules: {}
+};

.prettierrc

@@ -0,0 +1,4 @@
+{
+  "semi": false,
+  "singleQuote": true
+}

package.json

@@ -22,6 +22,14 @@
     "url": "https://github.com/danmindru/responsive-html-email-signature/issues"
   },
   "homepage": "https://github.com/danmindru/responsive-html-email-signature#readme",
+  "scripts": {
+    "start": "gulp",
+    "once": "gulp run-pipeline",
+    "deploy": "npm run test && cp -r dist demo && git push origin `git subtree split --prefix demo develop`:gh-pages --force",
+    "test": "npm run once && node ./node_modules/.bin/ava",
+    "format": "prettier {tasks,tests}/**/*.js gulpfile.js .eslintrc.js --write",
+    "lint": "eslint ./**/*.js gulpfile.js --fix"
+  },
   "dependencies": {
     "autoprefixer": "^9.6.1",
     "del": "^5.1.0",
@@ -46,16 +54,25 @@
   "resolutions": {
     "graceful-fs": "^4.1.15"
   },
-  "scripts": {
-    "start": "gulp",
-    "once": "gulp run-pipeline",
-    "deploy": "npm run test && cp -r dist demo && git push origin `git subtree split --prefix demo develop`:gh-pages --force",
-    "test": "npm run once && node ./node_modules/.bin/ava"
-  },
   "devDependencies": {
-    "ava": "^2.3.0"
+    "ava": "^2.3.0",
+    "eslint": "^6.3.0",
+    "eslint-config-standard": "^14.1.0",
+    "eslint-plugin-import": "^2.18.2",
+    "eslint-plugin-node": "^9.2.0",
+    "eslint-plugin-promise": "^4.2.1",
+    "eslint-plugin-standard": "^4.0.1",
+    "husky": "^3.0.5",
+    "prettier": "^1.18.2",
+    "pretty-quick": "^1.11.1"
   },
   "browserslist": [
     "last 5 versions"
-  ]
+  ],
+  "husky": {
+    "hooks": {
+      "pre-push": "npm test",
+      "pre-commit": "npm run lint && pretty-quick --staged"
+    }
+  }
 }