Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.5)
// Compass (v1.0.1)
// ----

/// Constants map
/// @type Map
$CONSTANTS: ();

/// Constant getter
/// @param {String} $name - Name of constant to get
/// @return {*} Constant value
/// @require $CONSTANTS
/// @throw 'Unknown constant `#{$name}`.'
@function const($name) {
  @if not map-has-key($CONSTANTS, $name) {
    @error 'Unknown constant `#{$name}`.'; 
  }
  
  @return map-get($CONSTANTS, $name);
}

/// Constant setter
/// @param {String} $name - Name of constant to get
/// @param {*} $value - Constant value
/// @return {*} Constant value
/// @require $CONSTANTS
/// @throw 'Constant `#{$name}` already defined.'
/// @output Nothing
@mixin const($name, $value) {
  @if map-has-key($CONSTANTS, $name) {
    @error 'Constant `#{$name}` already defined.'; 
  } 
    
  $CONSTANTS: map-merge($CONSTANTS, ($name: $value)) !global;
}

@include const('MAX_Z_INDEX', 2147483647);
@include const('PI', 3.1415926535897932384626433832795028841971693993751);
@include const('E', 2.71828182845904523536028747135266249775724709369995);

test {
  z-index: const('MAX_Z_INDEX');
}

SassMeister-output.css

test {
  z-index: 2147483647;
}