over_react_proptypes_do_not_throw

While any thrown errors/exceptions are caught by React and surfaced as prop warnings, throwing is not recommended.

Return the error instead.

GOOD:

class FooComponent extends UiComponent2<FooProps> {
  @override
  get propTypes => {
    keyForProp((p) => p.prop1): (props, info) {
      if (props.prop1 == null) {
        return PropError.required(info.propName);
      } else if (props.prop1 > 0) {
        return PropError.value(props.prop1, info.propName);
      }
      return null;
    },
  };
}

BAD:

class FooComponent extends UiComponent2<FooProps> {
  @override
  get propTypes => {
    keyForProp((p) => p.prop1): (props, info) {
      if (props.prop1 == null) {
        throw PropError.required(info.propName);
      } else if (props.prop1 > 0) {
        throw PropError.value(props.prop1, info.propName);
      }
      return null;
    },
  };
}