Using UNSAFE_componentWillMount in strict mode is not recommended #80
Description
Warning: Using UNSAFE_componentWillMount in strict mode is not recommended and may indicate bugs in your code. See https://fb.me/react-unsafe-component-lifecycles for details.
* Move code with side effects to componentDidMount, and set initial state in the constructor.
Please update the following components: SideEffect(NullComponent)
Updating react-hemlet to version 6.0.1 does not solve the problem.
bbc/simorgh#3893 (comment)
But judging by the comments, the library react-helmet-async allows to solve the problems