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diff --git a/javascript/videojs/src/js/mixins/stateful.js b/javascript/videojs/src/js/mixins/stateful.js
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--- a/javascript/videojs/src/js/mixins/stateful.js
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@@ -1,120 +0,0 @@
-/**
- * @file mixins/stateful.js
- * @module stateful
- */
-import {isEvented} from './evented';
-import * as Obj from '../utils/obj';
-
-/**
- * Contains methods that provide statefulness to an object which is passed
- * to {@link module:stateful}.
- *
- * @mixin StatefulMixin
- */
-const StatefulMixin = {
-
-  /**
-   * A hash containing arbitrary keys and values representing the state of
-   * the object.
-   *
-   * @type {Object}
-   */
-  state: {},
-
-  /**
-   * Set the state of an object by mutating its
-   * {@link module:stateful~StatefulMixin.state|state} object in place.
-   *
-   * @fires   module:stateful~StatefulMixin#statechanged
-   * @param   {Object|Function} stateUpdates
-   *          A new set of properties to shallow-merge into the plugin state.
-   *          Can be a plain object or a function returning a plain object.
-   *
-   * @return {Object|undefined}
-   *          An object containing changes that occurred. If no changes
-   *          occurred, returns `undefined`.
-   */
-  setState(stateUpdates) {
-
-    // Support providing the `stateUpdates` state as a function.
-    if (typeof stateUpdates === 'function') {
-      stateUpdates = stateUpdates();
-    }
-
-    let changes;
-
-    Obj.each(stateUpdates, (value, key) => {
-
-      // Record the change if the value is different from what's in the
-      // current state.
-      if (this.state[key] !== value) {
-        changes = changes || {};
-        changes[key] = {
-          from: this.state[key],
-          to: value
-        };
-      }
-
-      this.state[key] = value;
-    });
-
-    // Only trigger "statechange" if there were changes AND we have a trigger
-    // function. This allows us to not require that the target object be an
-    // evented object.
-    if (changes && isEvented(this)) {
-
-      /**
-       * An event triggered on an object that is both
-       * {@link module:stateful|stateful} and {@link module:evented|evented}
-       * indicating that its state has changed.
-       *
-       * @event    module:stateful~StatefulMixin#statechanged
-       * @type     {Object}
-       * @property {Object} changes
-       *           A hash containing the properties that were changed and
-       *           the values they were changed `from` and `to`.
-       */
-      this.trigger({
-        changes,
-        type: 'statechanged'
-      });
-    }
-
-    return changes;
-  }
-};
-
-/**
- * Applies {@link module:stateful~StatefulMixin|StatefulMixin} to a target
- * object.
- *
- * If the target object is {@link module:evented|evented} and has a
- * `handleStateChanged` method, that method will be automatically bound to the
- * `statechanged` event on itself.
- *
- * @param   {Object} target
- *          The object to be made stateful.
- *
- * @param   {Object} [defaultState]
- *          A default set of properties to populate the newly-stateful object's
- *          `state` property.
- *
- * @return {Object}
- *          Returns the `target`.
- */
-function stateful(target, defaultState) {
-  Object.assign(target, StatefulMixin);
-
-  // This happens after the mixing-in because we need to replace the `state`
-  // added in that step.
-  target.state = Object.assign({}, target.state, defaultState);
-
-  // Auto-bind the `handleStateChanged` method of the target object if it exists.
-  if (typeof target.handleStateChanged === 'function' && isEvented(target)) {
-    target.on('statechanged', target.handleStateChanged);
-  }
-
-  return target;
-}
-
-export default stateful;