media-feature-value-dollar-variable

Require a media feature value be a $-variable or disallow $-variables in media feature values.

@media (max-width: $var) { a { color: red; } }
//                 ↑
// Require or disallow this
}

Options

string: "always"|"never"

A media feature value must consist of just a single $-variable (possibly with inteprolation).

The following patterns are considered warnings:

@media (max-width: 300px) { b { color: red; } }

@media (max-width: $var + 10px) { b { color: red; } }

@media screen and (max-width: $var), or (min-width: 100px){ b { color: red; } }

@media screen and (max-width: #{$val} + 10px) { a { display: none; } }

@media screen and (max-width: #{$val + $x} ) { a { display: none; } }

@media screen and (min-width: funcName($p)){ b { color: red; } }

The following patterns are not considered warnings:

@media ( max-width: $var ) {b { color: red; }}

@media ( max-width: #{$var}) {b { color: red; }}

There must never be a $-variable in a media feature value. Even as a parameter to a function call.

The following patterns are considered warnings:

@media screen and (min-width: $var){ b { color: red; } }

@media screen and (min-width: 100px + $var){ b { color: red; } }

@media screen and (min-width: funcName($var)){ b { color: red; } }

The following patterns are not considered warnings:

@media screen and (min-width: 100px){ b { color: red; } }

@media screen and (min-width: 100px + 10px){ b { color: red; } }

@media screen and (min-width: funcName(10px)){ b { color: red; } }

Ignore keyword values like none, dark, fine, srgb.

For example, with "always":

The following patterns are not considered warnings:

@media screen and (max-width: $var) and (pointer: fine) {
  a { display: none; }
}