Sass: print to terminal

Question

Is there a way to have Sass print out a variable to the terminal?

Answer 1

Sass 3.3 and older

There are 2 error related directives:

@debug

The @debug directive prints the value of a SassScript expression to the standard error output stream.

@debug 10em + 12em;

outputs:

Line 1 DEBUG: 22em

@warn

The @warn directive prints the value of a SassScript expression to the standard error output stream. It's useful for libraries that need to warn users of deprecations or recovering from minor mixin usage mistakes.

@warn 'This is a warning';

Sass 3.4 and newer

@error

The @error directive throws the value of a SassScript expression as a fatal error, including a nice stack trace. It’s useful for validating arguments to mixins and functions. For example:

@error 'This is an error';

.foo {
  background: red;
}