@charset "UTF-8"; /// Checks for a valid number. /// /// @param {Number} $value /// /// @require {function} contains @function is-number($value) { @return contains("0" "1" "2" "3" "4" "5" "6" "7" "8" "9" 0 1 2 3 4 5 6 7 8 9, $value); }