Repository: react-hook-form/react-hook-form
File: src/controller.tsx (TypeScript)

Code before:
    readFormStateRef,
    fieldsRef,
    fieldArrayNamesRef,
    shallowFieldsStateRef,
  } = control || methods.control;
  const isNotFieldArray = !isNameInFieldArray(fieldArrayNamesRef.current, name);
  const getInitialValue = () =>
    !isUndefined(get(shallowFieldsStateRef.current, name)) && isNotFieldArray
      ? get(shallowFieldsStateRef.current, name)
      : isUndefined(defaultValue)
      ? get(defaultValuesRef.current, name)
      : defaultValue;
  const [value, setInputStateValue] = React.useState(getInitialValue());
  const valueRef = React.useRef(value);
  const ref = React.useRef({
    focus: () => null,
  });
  const onFocusRef = React.useRef(
    onFocus ||
      (() => {
        if (isFunction(ref.current.focus)) {
          ref.current.focus();
        } else {
          console.warn(
            `📋 'ref' from Controller render prop must be attached to a React component or a DOM Element whose ref provides a 'focus()' method`,
          );
        }
      }),
  );

  const shouldValidate = React.useCallback(
    (isBlurEvent?: boolean) =>
      !skipValidation({
        isBlurEvent,
        isReValidateOnBlur,
        isReValidateOnChange,
        isSubmitted,
        isTouched: !!get(touched, name),
        ...mode,
      }),
    [
      isReValidateOnBlur,
      isReValidateOnChange,
      isSubmitted,
      touched,
      name,
      mode,
    ],
  );

  const commonTask = React.useCallback(([event]: any[]) => {

Review comment (suggestion):
```suggestion
          if (process.env.NODE_ENV !== 'production') {
            console.warn(
              `📋 'ref' from Controller render prop must be attached to a React component or a DOM Element whose ref provides a 'focus()' method`,
            );
          }
```

Code after:
    readFormStateRef,
    fieldsRef,
    fieldArrayNamesRef,
    shallowFieldsStateRef,
  } = control || methods.control;
  const isNotFieldArray = !isNameInFieldArray(fieldArrayNamesRef.current, name);
  const getInitialValue = () =>
    !isUndefined(get(shallowFieldsStateRef.current, name)) && isNotFieldArray
      ? get(shallowFieldsStateRef.current, name)
      : isUndefined(defaultValue)
      ? get(defaultValuesRef.current, name)
      : defaultValue;
  const [value, setInputStateValue] = React.useState(getInitialValue());
  const valueRef = React.useRef(value);
  const ref = React.useRef({
    focus: () => null,
  });
  const onFocusRef = React.useRef(
    onFocus ||
      (() => {
        if (isFunction(ref.current.focus)) {
          ref.current.focus();
        } else {
          if (process.env.NODE_ENV !== 'production') {
            console.warn(
              `📋 'ref' from Controller render prop must be attached to a React component or a DOM Element whose ref provides a 'focus()' method`,
            );
          }
        }
      }),
  );

  const shouldValidate = React.useCallback(
    (isBlurEvent?: boolean) =>
      !skipValidation({
        isBlurEvent,
        isReValidateOnBlur,
        isReValidateOnChange,
        isSubmitted,
        isTouched: !!get(touched, name),
        ...mode,
      }),
    [
      isReValidateOnBlur,
      isReValidateOnChange,
      isSubmitted,
      touched,
      name,
      mode,
    ],
  );