diff --git a/core/modules/workflows/src/TransitionInterface.php b/core/modules/workflows/src/TransitionInterface.php
index 14f6d1487c..e87a538692 100644
--- a/core/modules/workflows/src/TransitionInterface.php
+++ b/core/modules/workflows/src/TransitionInterface.php
@@ -17,6 +17,16 @@
   const PLUGIN_FORM_KEY = 'transition';
 
   /**
+   * The transition direction from.
+   */
+  const DIRECTION_FROM = 'from';
+
+  /**
+   * The transition direction to.
+   */
+  const DIRECTION_TO = 'to';
+
+  /**
    * Gets the transition's ID.
    *
    * @return string
diff --git a/core/modules/workflows/src/WorkflowTypeInterface.php b/core/modules/workflows/src/WorkflowTypeInterface.php
index 0d9107104a..d3aba1c36f 100644
--- a/core/modules/workflows/src/WorkflowTypeInterface.php
+++ b/core/modules/workflows/src/WorkflowTypeInterface.php
@@ -262,7 +262,7 @@ public function getTransitions(array $transition_ids = NULL);
    * @return array
    *   The transition IDs for a state for the provided direction.
    */
-  public function getTransitionsForState($state_id, $direction = 'from');
+  public function getTransitionsForState($state_id, $direction = TransitionInterface::DIRECTION_FROM);
 
   /**
    * Gets a transition from state to state.