Is this a bug report?

yes

Can you also reproduce the problem with npm 4.x?

yes

Which terms did you search for in User Guide?

Environment

react-scripts-ts@2.15.1
node@v9.11.1
npm@5.6.0
yarn@1.3.2

mac os X High Sierra

Steps to Reproduce

1. create-creact-app example ---scripts-version=react-scripts-ts
2. cd example/
3. yarn start

Expected Behavior

Compile and show example page

Actual Behavior

(2236,19): Interface 'Element' cannot simultaneously extend types 'ReactElement<any>' and 'ReactElement<any>'.                         
Named property 'type' of types 'ReactElement<any>' and 'ReactElement<any>' are not identical. ```