component.js

import React from 'react'
import styled from 'styled-components';

class Blah extends React.Component {
  render() { return <div />; }
}

styled(Blah);

error.txt

21: styled(Blah);
     ^^^^^^^^^^^^ function call
 21: styled(Blah);
            ^^^^ class type: Blah. This type is incompatible with
 43:     (baseComponent: Component): StyledComponent,
                         ^^^^^^^^^ union: type application of identifier `React$Component` | function type. See lib: flow-typed/npm/styled-components_v1.4.x.js:43
  Member 1:
   20:   | React$Component<*, *, *>
           ^^^^^^^^^^^^^^^^^^^^^^^^ type application of identifier `React$Component`. See lib: flow-typed/npm/styled-components_v1.4.x.js:20
  Error:
   21: styled(Blah);
              ^^^^ class type: Blah. This type is incompatible with
   20:   | React$Component<*, *, *>
           ^^^^^^^^^^^^^^^^^^^^^^^^ React$Component. See lib: flow-typed/npm/styled-components_v1.4.x.js:20
  Member 2:
   21:   | (props: *) => React$Element<*>;
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function type. See lib: flow-typed/npm/styled-components_v1.4.x.js:21
  Error:
   21:   | (props: *) => React$Element<*>;
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function type. Callable signature not found in. See lib: flow-typed/npm/styled-components_v1.4.x.js:21
   21: styled(Blah);
              ^^^^ statics of Blah