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typeof React.Component stopped working #18946

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typeof React.Component stopped working#18946
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Working as IntendedThe behavior described is the intended behavior; this is not a bugThe behavior described is the intended behavior; this is not a bug
@mikew

Description

@mikew
mikew
opened on Oct 4, 2017
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TypeScript Version: 2.5.3

Code

class MyComponent extends React.Component<{}, {}> {
  render () {
    return null
  }
}

function thisTakesAComponent (component: typeof React.Component) {

}

thisTakesAComponent(MyComponent)

Expected behavior:
Should compile fine.

Actual behavior:

Argument of type 'typeof MyComponent' is not assignable to parameter of type 'typeof Component'.
  Type 'MyComponent' is not assignable to type 'Component<P, S>'.
    Types of property 'setState' are incompatible.
      Type '{ <K extends never>(f: (prevState: {}, props: {}) => Pick<{}, K>, callback?: (() => any) | undefi...' is not assignable to type '{ <K extends keyof S>(f: (prevState: S, props: P) => Pick<S, K>, callback?: (() => any) | undefin...'.
        Types of parameters 'f' and 'f' are incompatible.
          Types of parameters 'prevState' and 'prevState' are incompatible.
            Type '{}' is not assignable to type 'S'.
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    Working as IntendedThe behavior described is the intended behavior; this is not a bugThe behavior described is the intended behavior; this is not a bug

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