21 files declare their use of Variable in Business Rules 8

AutocompleteTags.php in src/Controller/AutocompleteTags.php

BusinessRulesItemPluginBase.php in src/Plugin/BusinessRulesItemPluginBase.php

BusinessRulesProcessor.php in src/Util/BusinessRulesProcessor.php

BusinessRulesUtil.php in src/Util/BusinessRulesUtil.php

BusinessRulesVariablePlugin.php in src/Plugin/BusinessRulesVariablePlugin.php

BusinessRulesVariablePluginInterface.php in src/Plugin/BusinessRulesVariablePluginInterface.php

ConfigEntityCalculateDependencyTest.php in tests/src/Unit/ConfigEntityCalculateDependencyTest.php

CustomValueVariable.php in src/Plugin/BusinessRulesVariable/CustomValueVariable.php

EntityEmptyVariable.php in src/Plugin/BusinessRulesVariable/EntityEmptyVariable.php

EntityFieldVariable.php in src/Plugin/BusinessRulesVariable/EntityFieldVariable.php

FetchEntityVariableAction.php in src/Plugin/BusinessRulesAction/FetchEntityVariableAction.php

FillEntityVariableFields.php in src/Plugin/BusinessRulesAction/FillEntityVariableFields.php

Flowchart.php in src/Util/Flowchart/Flowchart.php

ItemForm.php in src/Form/ItemForm.php

LoopThroughFieldVariable.php in src/Plugin/BusinessRulesAction/LoopThroughFieldVariable.php

LoopThroughViewResult.php in src/Plugin/BusinessRulesAction/LoopThroughViewResult.php

SaveEntityVariableAction.php in src/Plugin/BusinessRulesAction/SaveEntityVariableAction.php

UrlVariable.php in src/Plugin/BusinessRulesVariable/UrlVariable.php

UserVariable.php in src/Plugin/BusinessRulesVariable/UserVariable.php

UserVariableHasRole.php in src/Plugin/BusinessRulesCondition/UserVariableHasRole.php

ViewResultVariable.php in src/Plugin/BusinessRulesVariable/ViewResultVariable.php