React v16.9.0 and the Roadmap Update

Renaming Unsafe Lifecycle Methods 

Over a year ago, we announced that unsafe lifecycle methods are getting renamed:

• componentWillMount → UNSAFE_componentWillMount
• componentWillReceiveProps → UNSAFE_componentWillReceiveProps
• componentWillUpdate → UNSAFE_componentWillUpdate

Deprecating javascript: URLs

URLs starting with javascript: are a dangerous attack surface because it’s easy to accidentally include unsanitized output in a tag like <a href> and create a security hole

Deprecating “Factory” Components 

Before compiling JavaScript classes with Babel became popular, React had support for a “factory” component that returns an object with a render method:

New Features 

Async act() for Testing

Performance Measurements with <React.Profiler>

Reference: Reactjs Blog