Take persistence from dashPersistence on element

Author: T4rk1n

components/dash-core-components/src/components/Textarea.react.js

@@ -42,8 +42,8 @@ const Textarea = ({
     n_blur_timestamp = -1,
     n_clicks,
     n_clicks_timestamp = -1,
-    persisted_props = ['value'],
-    persistence_type = 'local',
+    persisted_props,
+    persistence_type,
     ...props
 }) => {
     const ctx = window.dash_component_api.useDashContext();
@@ -73,6 +73,11 @@ const Textarea = ({
     );
 };
 
+Textarea.dashPersistence = {
+    persisted_props: ['value'],
+    persistence_type: 'local',
+};
+
 Textarea.propTypes = {
     /**
      * The ID of this component, used to identify dash components

dash/dash-renderer/src/persistence.js

@@ -290,7 +290,9 @@ const getProps = layout => {
     const {id, persistence} = props;
 
     const element = Registry.resolve(layout);
-    const getVal = prop => props[prop] || (element.defaultProps || {})[prop];
+    const getVal = prop =>
+        props[prop] ||
+        (element.defaultProps || element.dashPersistence || {})[prop];
     const persisted_props = getVal('persisted_props');
     const persistence_type = getVal('persistence_type');
     const canPersist = id && persisted_props && persistence_type;