chore: fix type

Author: philippfromme

lib/base/VariableResolver.js

@@ -16,6 +16,7 @@ import { getParents, getScope } from './util/scopeUtil';
  * @typedef {AdditionalVariable} ProcessVariable
  * @property {Array<ModdleElement>} origin
  * @property {ModdleElement} scope
+ * @property {Array<Function>} provider
  */
 
 /**