Top react issues

React doesn't provide an API witch is doing some side affects from top to bottom.

Make stateless components “Pure” by default in React 17

Context Consumer forcing the first child to always re-render on state change

componentDidCatch doesn't catch some invariants

Reconciler Needs Investigation Regression

Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined

Warning if React.forwardRef render function doesn't take exactly two arguments is confusing when more than 2 arguments

Enhancement

passing React.createContext() mistakenly as if it were an element causes confusing error

Stale Enhancement

Consider keeping legacy context API for non-state usages

Question

Avoid reconciliation, alternative component interface

Question

React 16 className reconciliation problem - classNames not updated on render despite changing.