Allow guards to work with undefined variables

.guard () when (@variable) {
  a {
    color: red;
  }
}

Variable isn’t defined, therefore no output.

@variable: true;

.guard () when (@variable) {
  a {
    color: red;
  }
}

Variable is definied, therefore output:

a {
  color: red;
}

[ashenden]

Has there been any movement on this request? I’ve been anxious for an undefined variable check for some time now. At the moment, I have a work around that is far from ideal…

p {
  & when not (@body-text-color = null) {
    color: @body-text-color;
  }
}

but, for this to work, the variable must exist and be defined as null by default. This would be far more effective/flexible if I could just instead check if the variable even exists in the first place.

[matthew-dean]

What’s also happened since this was open is the if() function. So you can do color: if((@variable), green, red);