Add eslint

Author: pazams

.eslintrc

@@ -0,0 +1,28 @@
+{
+  "parser": "babel-eslint",
+  "extends": [
+    "prettier",
+    "prettier/standard"
+  ],
+  "plugins": ["prettier"],
+  "env": {
+    "browser": true,
+    "node": true,
+    "es6": true,
+    "mocha": true
+  },
+  "parserOptions": {
+    "ecmaVersion": 2017,
+    "sourceType": "module",
+    "ecmaFeatures": {
+      "modules": true
+    }
+  },
+  "rules": {
+    "prettier/prettier": 2,
+    "no-param-reassign": "error",
+    "no-shadow": 2,
+    "no-undef": 2,
+    "eqeqeq": ["error", "smart"]
+  }
+}

package.json

@@ -4,8 +4,9 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "test": "nyc mocha test/*",
-    "prettier:watch": "onchange '**/*.js' -- prettier --write {{changed}}"
+    "test": "npm run eslint && nyc mocha test/*",
+    "prettier:watch": "onchange '**/*.js' -- prettier --write {{changed}}",
+    "eslint": "eslint ./ --ext .js"
   },
   "author": "Pazams <[email protected]>",
   "license": "MIT",
@@ -14,6 +15,10 @@
     "web3": "^1.0.0-beta.36"
   },
   "devDependencies": {
+    "babel-eslint": "^8.0.1",
+    "eslint": "^4.8.0",
+    "eslint-plugin-prettier": "^2.6.0",
+    "eslint-config-prettier": "^2.9.0",
     "mocha": "^5.2.0",
     "nyc": "^13.1.0",
     "onchange": "^5.0.2",

test/test.js

@@ -6,9 +6,9 @@ const ProviderMock = require('./provider-mock');
 const ContractMock = require('./contract-mock');
 
 describe('dappauth', function() {
-  keyA = generateRandomKey();
-  keyB = generateRandomKey();
-  keyC = generateRandomKey();
+  const keyA = generateRandomKey();
+  const keyB = generateRandomKey();
+  const keyC = generateRandomKey();
 
   const testCases = [
     {