Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.1)
// Compass (v0.13.alpha.10)
// ----

adding unit to unitless numbers {
    test-1: type-of(   12 * 1em  );
    test-2: type-of(   12 +  em  );
    test-3: type-of(   12 + 'em' );
    test-4: type-of( #{12 + 'em'});
    test-5: type-of( #{12}em     );
}

SassMeister-output.css

adding unit to unitless numbers {
  test-1: number;
  test-2: string;
  test-3: string;
  test-4: string;
  test-5: string;
}