Add linting

Author: dfcook

.eslintignore

@@ -0,0 +1,3 @@
+/node_modules/
+/npm/
+/coverage/

.eslintrc.js

@@ -0,0 +1,30 @@
+// http://eslint.org/docs/user-guide/configuring
+
+module.exports = {
+  root: true,
+  parserOptions: {
+    parser: 'babel-eslint',
+    ecmaVersion: 2017,
+    sourceType: "module"
+  },
+  env: {
+    browser: true,
+    jest: true
+  },
+  // https://github.com/feross/standard/blob/master/RULES.md#javascript-standard-style
+  extends: [
+    'standard',
+    'plugin:vue/recommended'
+  ],
+  // required to lint *.vue files
+  plugins: [
+    'vue'
+  ],
+  // add your custom rules here
+  rules: {
+    // allow paren-less arrow functions
+    'arrow-parens': 0,
+    // allow async-await
+    'generator-star-spacing': 0
+  }
+}