/// Returns the value for a given key. If the value is empty or null,
/// it will throw an error during compilation.
///
/// @group helpers_utility
///
/// @parameter {string} $value
/// @parameter {string} $key - Use to show which key is required
/// @parameter {boolean} $required
///
/// @return {value} 1.42rem
///
/// @example scss - Usage
///   k-required(20px, 'font-size');
///   // 20px
///
///   k-required('', 'font-size');
///   // "font-size" is required "k-Button: $button"

@function k-required($value, $name) {
  @if not $value {
    $error-message: k-log('"#{$name}" is required in "#{$k-module}".');
  }

  @return $value;
}