[Autocomplete] Warn when mixing uncontrolled and controlled (mui#19060)

packages/material-ui-lab/src/useAutocomplete/useAutocomplete.js

@@ -192,6 +192,25 @@ export default function useAutocomplete(props) {
   });
   const value = isControlled ? valueProp : valueState;
 
+  if (process.env.NODE_ENV !== 'production') {
+    // eslint-disable-next-line react-hooks/rules-of-hooks
+    React.useEffect(() => {
+      if (isControlled !== (valueProp !== undefined)) {
+        console.error(
+          [
+            `Material-UI: A component is changing ${
+              isControlled ? 'a ' : 'an un'
+            }controlled useAutocomplete to be ${isControlled ? 'un' : ''}controlled.`,
+            'Elements should not switch from uncontrolled to controlled (or vice versa).',
+            'Decide between using a controlled or uncontrolled useAutocomplete ' +
+              'element for the lifetime of the component.',
+            'More info: https://fb.me/react-controlled-components',
+          ].join('\n'),
+        );
+      }
+    }, [valueProp, isControlled]);
+  }
+
   const { current: isInputValueControlled } = React.useRef(inputValueProp != null);
   const [inputValueState, setInputValue] = React.useState('');
   const inputValue = isInputValueControlled ? inputValueProp : inputValueState;