PropertyUnits rule in SCSS Lint

Feeling proud about my latest open source contribution. This time, it’ to SCSS Lint.

I added a rule that enforces the units used on element(s).

From the docs:

PropertyUnits

Configure which units are allowed for property values.

By default a value may have any kind of unit. You can adjust which units are allowed globally by setting the global option. Alternately, you can specify a list of units for a single property by adding it to the properties option, e.g.

PropertyUnits:
global: ['em', 'rem', '%'] # Allow relative units globally
properties:
border: ['px'] # Only pixels
line-height: [] # No units allowed
margin: ['em', 'rem']

With the above configuration, the following issues would be reported:

p {
  border: 1rem solid blue; // rem not in `border` list
  line-height: 55px; // px not in `line-height` list
  padding: 10px; // px not in `global` list
  margin: 10%; // % not in `margin` list
}