Add eslint target and rules.

Author: davidlehn

.eslintrc

@@ -1,10 +1,55 @@
 {
   "env": {
-    "amd": true,
-    "browser": true,
-    "jquery": true
+    "es6": true,
+    "node": true
+  },
+  "parserOptions": {
+    "ecmaVersion": 8,
+    "sourceType": "module"
   },
   "rules": {
-    "indent": ["error", 2, {"outerIIFEBody": 0}]
+    "arrow-spacing": "error",
+    "block-spacing": ["error", "never"],
+    "comma-dangle": ["error", "only-multiline"],
+    "comma-spacing": "error",
+    "curly": "error",
+    "eol-last": "error",
+    "key-spacing": ["error", {"beforeColon": false, "afterColon": true}],
+    "keyword-spacing": ["error", {"overrides": {
+      "catch": {"after": false},
+      "for": {"after": false},
+      "if": {"after": false},
+      "switch": {"after": false},
+      "while": {"after": false}
+      }}],
+    "indent": ["warn", 2, {
+      "SwitchCase": 1,
+      "FunctionExpression": {
+        "parameters": 1
+      },
+      "CallExpression": {"arguments": 1}
+    }],
+    "linebreak-style": ["error", "unix"],
+    "max-len": ["error", 80],
+    "no-const-assign": "error",
+    "no-extra-semi": "error",
+    "no-irregular-whitespace": "error",
+    "no-mixed-spaces-and-tabs": "error",
+    "no-multi-spaces": "error",
+    "no-multiple-empty-lines": ["error", {"max": 1}],
+    "no-spaced-func": "error",
+    "no-trailing-spaces": "error",
+    "no-undef": "error",
+    "no-unused-vars": "error",
+    "no-var": "error",
+    "object-curly-spacing": "error",
+    "prefer-const": "error",
+    "semi": ["error", "always"],
+    "semi-spacing": "error",
+    "space-before-blocks": "error",
+    "space-before-function-paren": ["error", "never"],
+    "space-infix-ops": "error",
+    "space-in-parens": ["error", "never"],
+    "spaced-comment": ["error", "always", {"block": {"markers": ["!"]}}]
   }
 }

package.json

@@ -48,6 +48,7 @@
     "core-js": "^2.5.3",
     "cors": "^2.7.1",
     "cross-env": "^5.1.3",
+    "eslint": "^4.15.0",
     "express": "^4.16.2",
     "fs-extra": "^5.0.0",
     "join-path-js": "0.0.0",
@@ -98,6 +99,7 @@
     "test-karma": "cross-env NODE_ENV=test karma start",
     "coverage": "nyc --reporter=lcov --reporter=text-summary npm test",
     "coverage-report": "nyc report",
+    "eslint": "eslint lib/*.js tests/*.js",
     "jscs": "jscs lib/*.js tests/*.js",
     "jshint": "jshint lib/*.js tests/*.js"
   },