ember-source/types/stable/@ember/enumerable/index.d.ts

declare module '@ember/enumerable' {
  import Mixin from '@ember/object/mixin';
  /**
    @module @ember/enumerable
    @private
    */
  /**
      The methods in this mixin have been moved to [MutableArray](/ember/release/classes/MutableArray). This mixin has
      been intentionally preserved to avoid breaking Enumerable.detect checks
      until the community migrates away from them.

      @class Enumerable
      @private
    */
  interface Enumerable {}
  const Enumerable: Mixin;
  export default Enumerable;
}