tests/cases/conformance/jsx/file.tsx(4,5): error TS2416: Property 'render' in type 'BigGreeter' is not assignable to the same property in base type 'Component<{}, {}>'.
  Type '() => JSX.Element' is not assignable to type '() => JSX.Element'. Two different types with this name exist, but they are unrelated.
    The 'this' types of each signature are incompatible.
      Property 'greeting' is missing in type 'Component<P, S>' but required in type 'BigGreeter'.
tests/cases/conformance/jsx/file.tsx(11,21): error TS2322: Type '{ prop1: string; }' is not assignable to type 'IntrinsicAttributes & IntrinsicClassAttributes<BigGreeter> & { children?: ReactNode; }'.
  Property 'prop1' does not exist on type 'IntrinsicAttributes & IntrinsicClassAttributes<BigGreeter> & { children?: ReactNode; }'.
tests/cases/conformance/jsx/file.tsx(14,39): error TS2532: Object is possibly 'undefined'.


==== tests/cases/conformance/jsx/file.tsx (3 errors) ====
    import React = require('react');
    
    class BigGreeter extends React.Component<{ }, {}> {
        render() {
        ~~~~~~
!!! error TS2416: Property 'render' in type 'BigGreeter' is not assignable to the same property in base type 'Component<{}, {}>'.
!!! error TS2416:   Type '() => JSX.Element' is not assignable to type '() => JSX.Element'. Two different types with this name exist, but they are unrelated.
!!! error TS2416:     The 'this' types of each signature are incompatible.
!!! error TS2416:       Property 'greeting' is missing in type 'Component<P, S>' but required in type 'BigGreeter'.
!!! related TS2728 tests/cases/conformance/jsx/file.tsx:7:5: 'greeting' is declared here.
            return <div>Default hi</div>;
        }
        greeting: string;
    }
    
    // Error
    let a = <BigGreeter prop1="hello" />
                        ~~~~~
!!! error TS2322: Type '{ prop1: string; }' is not assignable to type 'IntrinsicAttributes & IntrinsicClassAttributes<BigGreeter> & { children?: ReactNode; }'.
!!! error TS2322:   Property 'prop1' does not exist on type 'IntrinsicAttributes & IntrinsicClassAttributes<BigGreeter> & { children?: ReactNode; }'.
    
    // OK
    let b = <BigGreeter ref={(input) => { this.textInput = input; }} />
                                          ~~~~
!!! error TS2532: Object is possibly 'undefined'.
    let c = <BigGreeter data-extra="hi" />