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SassMeister-input.scss

// ----
// Sass (v3.3.9)
// Compass (v1.0.0.alpha.20)
// ----

// This is an example to define private mixin(s)/function(s).
// by https://twitter.com/phize

// If this is not a bug, it is a bit useful
// although there are no way to export private mixin(s)/function(s).

// Dependency Injection: mixin injection
// http://sassmeister.com/gist/5122325c0c29889b91c3
 
// More simple way: @content injection
// http://sassmeister.com/gist/3686b8eb3462fef52013
 
// Polymorphic components:
// http://sassmeister.com/gist/1a10ec1c1556dfd3d6b5
 
// Type hinting:
// http://sassmeister.com/gist/28a2665ab30142df49b0

// Building decoupled components:
// https://sassmeister.com/gist/2ecf14567d1132c265e3

@mixin my-mixin() {
  content: 'This is the global-mixin';
}

.class {
  // A private variable.
  $private-var: (
    my-key: 'private'
  );
  
  // You may import private mixin(s)/function(s) by @import.
  // @import 'default-private-mixins';
  // @import 'default-private-functions';

  // A private mixin: You may override global/default private mixin.
  @mixin my-mixin() {
    content: 'This is a private mixin';
  }

  // A private function: You may override global/default private function.
  @function my-map-get($map, $key) {
    @return map-get($map, 'my-' + $key);
  }
 
  // However, this doesn't work.
  // @function map-get($map, $key) {
  //   @return map-get($map, 'my-' + $key);
  // }

  @include my-mixin();

  map-value: my-map-get($private-var, 'key');
}

.another-class {
    @include my-mixin();
}

SassMeister-output.css

.class {
  content: 'This is a private mixin';
  map-value: "private";
}

.another-class {
  content: 'This is the global-mixin';
}