added eslint with rules from metamask-extension

.eslintrc

@@ -0,0 +1,154 @@
+{
+  "parser": "babel-eslint",
+  "parserOptions": {
+    "sourceType": "module",
+    "ecmaVersion": 2017,
+    "ecmaFeatures": {
+      "experimentalObjectRestSpread": true,
+      "impliedStrict": true,
+      "modules": true,
+      "blockBindings": true,
+      "arrowFunctions": true,
+      "objectLiteralShorthandMethods": true,
+      "objectLiteralShorthandProperties": true,
+      "templateStrings": true,
+      "classes": true,
+      "jsx": true
+    },
+  },
+
+  "env": {
+    "es6": true,
+    "node": true,
+    "browser": true,
+    "mocha" : true
+  },
+
+  "plugins": [
+    "mocha",
+    "chai",
+    "json"
+  ],
+
+  "globals": {},
+
+  "rules": {
+    "no-restricted-globals": ["error", "event"],
+    "accessor-pairs": 2,
+    "arrow-spacing": [2, { "before": true, "after": true }],
+    "block-spacing": [2, "always"],
+    "brace-style": [2, "1tbs", { "allowSingleLine": true }],
+    "camelcase": [2, { "properties": "never" }],
+    "comma-dangle": [2, "always-multiline"],
+    "comma-spacing": [2, { "before": false, "after": true }],
+    "comma-style": [2, "last"],
+    "constructor-super": 2,
+    "curly": [2, "multi-line"],
+    "dot-location": [2, "property"],
+    "eol-last": 1,
+    "eqeqeq": [2, "allow-null"],
+    "generator-star-spacing": [2, { "before": true, "after": true }],
+    "handle-callback-err": [1, "^(err|error)$" ],
+    "indent": "off",
+    "jsx-quotes": [2, "prefer-double"],
+    "key-spacing": 1,
+    "keyword-spacing": [2, { "before": true, "after": true }],
+    "new-cap": [2, { "newIsCap": true, "capIsNew": false }],
+    "new-parens": 2,
+    "no-array-constructor": 2,
+    "no-caller": 2,
+    "no-class-assign": 2,
+    "no-cond-assign": 2,
+    "no-const-assign": 2,
+    "no-control-regex": 2,
+    "no-debugger": 2,
+    "no-delete-var": 2,
+    "no-dupe-args": 2,
+    "no-dupe-class-members": 2,
+    "no-dupe-keys": 2,
+    "no-duplicate-case": 2,
+    "no-duplicate-imports": 2,
+    "no-empty-character-class": 2,
+    "no-empty-pattern": 2,
+    "no-eval": 2,
+    "no-ex-assign": 2,
+    "no-extend-native": 2,
+    "no-extra-bind": 2,
+    "no-extra-boolean-cast": 2,
+    "no-extra-parens": [2, "functions"],
+    "no-fallthrough": 2,
+    "no-floating-decimal": 2,
+    "no-func-assign": 2,
+    "no-implied-eval": 2,
+    "no-inner-declarations": [2, "functions"],
+    "no-invalid-regexp": 2,
+    "no-irregular-whitespace": 2,
+    "no-iterator": 2,
+    "no-label-var": 2,
+    "no-labels": [2, { "allowLoop": false, "allowSwitch": false }],
+    "no-lone-blocks": 2,
+    "no-mixed-spaces-and-tabs": 2,
+    "no-multi-spaces": 2,
+    "no-multi-str": 2,
+    "no-multiple-empty-lines": [1, { "max": 2 }],
+    "no-native-reassign": 2,
+    "no-negated-in-lhs": 2,
+    "no-new": 2,
+    "no-new-func": 2,
+    "no-new-object": 2,
+    "no-new-require": 2,
+    "no-new-symbol": 2,
+    "no-new-wrappers": 2,
+    "no-obj-calls": 2,
+    "no-octal": 2,
+    "no-octal-escape": 2,
+    "no-path-concat": 1,
+    "no-proto": 2,
+    "no-redeclare": 2,
+    "no-regex-spaces": 2,
+    "no-return-assign": [2, "except-parens"],
+    "no-self-assign": 2,
+    "no-self-compare": 2,
+    "no-sequences": 2,
+    "no-shadow-restricted-names": 2,
+    "no-spaced-func": 2,
+    "no-sparse-arrays": 2,
+    "no-this-before-super": 2,
+    "no-throw-literal": 2,
+    "no-trailing-spaces": 1,
+    "no-undef": 2,
+    "no-undef-init": 2,
+    "no-unexpected-multiline": 2,
+    "no-unmodified-loop-condition": 2,
+    "no-unneeded-ternary": [2, { "defaultAssignment": false }],
+    "no-unreachable": 2,
+    "no-unsafe-finally": 2,
+    "no-unused-vars": [2, { "vars": "all", "args": "none" }],
+    "no-useless-call": 2,
+    "no-useless-computed-key": 2,
+    "no-useless-constructor": 2,
+    "no-useless-escape": 2,
+    "no-whitespace-before-property": 2,
+    "no-with": 2,
+    "one-var": [2, { "initialized": "never" }],
+    "operator-linebreak": [1, "after", { "overrides": { "?": "ignore", ":": "ignore" } }],
+    "padded-blocks": "off",
+    "quotes": [2, "single", {"avoidEscape": true, "allowTemplateLiterals": true}],
+    "semi": [2, "never"],
+    "semi-spacing": [2, { "before": false, "after": true }],
+    "space-before-blocks": [1, "always"],
+    "space-before-function-paren": [1, "always"],
+    "space-in-parens": [1, "never"],
+    "space-infix-ops": 2,
+    "space-unary-ops": [2, { "words": true, "nonwords": false }],
+    "spaced-comment": [2, "always", { "markers": ["global", "globals", "eslint", "eslint-disable", "*package", "!", ","], "exceptions": ["=", "-"] } ],
+    "strict": 0,
+    "template-curly-spacing": [2, "never"],
+    "use-isnan": 2,
+    "valid-typeof": 2,
+    "wrap-iife": [2, "any"],
+    "yield-star-spacing": [2, "both"],
+    "yoda": [2, "never"],
+    "prefer-const": 1,
+  }
+}

package.json

@@ -4,7 +4,9 @@
   "description": "A MetaMask compatible keyring, for trezor hardware wallets",
   "main": "index.js",
   "scripts": {
-    "test": "mocha"
+    "test": "mocha",
+    "lint": "./node_modules/.bin/eslint . --ext .js",
+    "lint::fix": "./node_modules/.bin/eslint --fix . --ext .js"
   },
   "repository": {
     "type": "git",
@@ -25,9 +27,14 @@
   },
   "devDependencies": {
     "assert": "^1.4.1",
+    "babel-eslint": "^8.0.0",
     "babel-runtime": "^6.26.0",
     "chai": "^4.1.2",
     "chai-spies": "^1.0.0",
+    "eslint": "^5.0.0",
+    "eslint-plugin-chai": "0.0.1",
+    "eslint-plugin-json": "^1.2.0",
+    "eslint-plugin-mocha": "^5.0.0",
     "mocha": "^5.0.4"
   }
 }