Skelton View Using React Concurrent Mode

[yuichkun]

Use concurrent mode to handle loading and errors in a declarative style.

• The page has several sections
  • The page component has an error boundary and loading fallback (is a skelton UI)
• The child components each have an error boundary and loading fallback
• The page has buttons to simulate each error/loading state

[yuichkun]

https://qiita.com/uhyo/items/edd51ca053ed0e7ae83d

[yuichkun]

https://github.com/react-spring/react-spring