Release react 5.1.0

[aaronlademann-wf]

This Dart 2 only, stable release of react includes:

Full React JS 16.x Component Lifecycle Support

• The new Component2 class replaces the now deprecated Component class.

  • Faster

  • Initial renders ~10% faster

  • Re-renders ~7 - 30% faster

  • Improved developer experience

    • Props and state values now show up in the React DevTools just as they would if you were using React JS, and primitive values (strings, numbers, booleans) can be edited live, just like in React JS!

    

  • Easier to maintain

  • Easier integration with JS libs

  • ReactJsComponentFactoryProxy makes it easy to use JS components with Dart!

    • Check out this example of MaterialUI components!

  • Supports new lifecycle methods, allowing us to use Concurrent Mode in the future

  • componentWillMount => componentDidMount

  • componentWillReceiveProps => getDerivedStateFromProps (new)

  • componentWillUpdate => getSnapshotBeforeUpdate (new)

  • componentDidCatch / getDerivedStateFromError (new)

    • Adds support for error boundaries.

Portals

• "Portals provide a first-class way to render children into a DOM node that exists outside the DOM hierarchy of the parent component."

Improved, stable Context API

• "Context provides a way to pass data through the component tree without having to pass props down manually at every level. … Context is primarily used when some data needs to be accessible by many components at different nesting levels. Apply it sparingly because it makes component reuse more difficult."

Fragments

• "A common pattern in React is for a component to return multiple elements. Fragments let you group a list of children without adding extra nodes to the DOM."
• Component.render can now return Fragments (multiple children) or other values like strings and lists instead of just a single ReactElement

New and improved ref API: React.createRef

React Redux is now included in the JS bundles and exposed via window.ReactRedux.

No more Dart 1 SDK support

Full list of 5.1.0 Changes

[joebingham-wk]

+1