Integrate coffeelint into the project.

Known issues:

- Currently a dummy transform is needed to apply a different syntax parser (iced-coffee-script-3 in our case) which is situated in `util/dummy-transform`. It's installed as a devDependency.

.coffeelintignore

@@ -0,0 +1,8 @@
+.git*
+.docker*
+
+etc
+node_modules
+
+dist
+src.js

coffeelint.json

@@ -0,0 +1,141 @@
+{
+  "arrow_spacing": {
+    "level": "ignore"
+  },
+  "braces_spacing": {
+    "level": "ignore",
+    "spaces": 0,
+    "empty_object_spaces": 0
+  },
+  "camel_case_classes": {
+    "level": "error"
+  },
+	"coffeelint": {
+		"coffeescript": "iced-coffee-script-3",
+		"transforms": [
+			"dummy-transform"
+		]
+	},
+  "coffeescript_error": {
+    "level": "error"
+  },
+  "colon_assignment_spacing": {
+    "level": "ignore",
+    "spacing": {
+      "left": 0,
+      "right": 0
+    }
+  },
+  "cyclomatic_complexity": {
+    "level": "ignore",
+    "value": 10
+  },
+  "duplicate_key": {
+    "level": "error"
+  },
+  "empty_constructor_needs_parens": {
+    "level": "ignore"
+  },
+  "ensure_comprehensions": {
+    "level": "warn"
+  },
+  "eol_last": {
+    "level": "ignore"
+  },
+  "indentation": {
+    "value": 1,
+    "level": "warn"
+  },
+  "line_endings": {
+    "level": "ignore",
+    "value": "unix"
+  },
+  "max_line_length": {
+    "value": 80,
+    "level": "error",
+    "limitComments": true
+  },
+  "missing_fat_arrows": {
+    "level": "ignore",
+    "is_strict": false
+  },
+  "newlines_after_classes": {
+    "value": 3,
+    "level": "ignore"
+  },
+  "no_backticks": {
+    "level": "error"
+  },
+  "no_debugger": {
+    "level": "warn",
+    "console": false
+  },
+  "no_empty_functions": {
+    "level": "ignore"
+  },
+  "no_empty_param_list": {
+    "level": "ignore"
+  },
+  "no_implicit_braces": {
+    "level": "ignore",
+    "strict": true
+  },
+  "no_implicit_parens": {
+    "level": "ignore",
+    "strict": true
+  },
+  "no_interpolation_in_single_quotes": {
+    "level": "ignore"
+  },
+  "no_nested_string_interpolation": {
+    "level": "warn"
+  },
+  "no_plusplus": {
+    "level": "ignore"
+  },
+  "no_private_function_fat_arrows": {
+    "level": "warn"
+  },
+  "no_stand_alone_at": {
+    "level": "ignore"
+  },
+  "no_tabs": {
+    "level": "ignore"
+  },
+  "no_this": {
+    "level": "ignore"
+  },
+  "no_throwing_strings": {
+    "level": "error"
+  },
+  "no_trailing_semicolons": {
+    "level": "error"
+  },
+  "no_trailing_whitespace": {
+    "level": "error",
+    "allowed_in_comments": false,
+    "allowed_in_empty_lines": true
+  },
+  "no_unnecessary_double_quotes": {
+    "level": "ignore"
+  },
+  "no_unnecessary_fat_arrows": {
+    "level": "warn"
+  },
+  "non_empty_constructor_needs_parens": {
+    "level": "ignore"
+  },
+  "prefer_english_operator": {
+    "level": "ignore",
+    "doubleNotLevel": "ignore"
+  },
+  "space_operators": {
+    "level": "ignore"
+  },
+  "spacing_after_comma": {
+    "level": "ignore"
+  },
+  "transform_messes_up_line_numbers": {
+    "level": "warn"
+  }
+}

package.json

@@ -63,6 +63,13 @@
   "devDependencies": {
     "babel-cli": "^6.24.1",
     "babel-preset-es2017-node7": "^0.5.2",
+    "coffeelint": "^1.16.0",
+    "coffeelint-config-groupon": "^4.1.0",
+    "coffeelint-forbidden-keywords": "~0.1.1",
+    "coffeelint-no-mocha-only": "^1.0.0",
+    "coffeelint-use-strict": "^1.0.0",
+    "coffeescope2": "~0.4.2",
+    "dummy-transform": "file:./util/dummy-transform",
     "eslint": "^3.19.0",
     "eslint-config-airbnb": "^15.0.1",
     "eslint-plugin-import": "^2.2.0",

util/dummy-transform/index.js

@@ -0,0 +1,5 @@
+function transform(code) {
+  return code;
+}
+
+module.exports = { transform };

util/dummy-transform/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "dummy-transform",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "MIT"
+}