Lint CSS files?

[pdehaan]

Currently, our CSS files aren't very complex, but it may be worth considering adding something like stylelint to the tool belt.

Possible solution:

// .stylelintrc
{
  "extends": "stylelint-config-standard",
  "ignoreFiles": [
    "public/css/vendor/*.css"
  ]
}

diff --git a/package.json b/package.json
index 9c75c03..0e4ff85 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,8 @@
     "npm-run-all": "^4.1.2",
     "nsp": "^3.2.1",
     "nyc": "^11.5.0",
+    "stylelint": "^9.2.0",
+    "stylelint-config-standard": "^18.2.0",
     "tape": "^4.9.0"
   },
   "engines": {
@@ -49,6 +51,7 @@
   },
   "scripts": {
     "lint": "npm-run-all lint:*",
+    "lint:css": "stylelint 'public/css/**/*.css'",
     "lint:js": "eslint .",
     "lint:nsp": "nsp check",
     "pretest": "npm run lint",

That should lint all the CSS files (except the files in the ./public/css/vendor/ directory).