### Description Bug ### Expected behavior ``` npm start ``` should not return a UnhandledPromiseRejectionWarning ### Actual behavior ``` cschroeter@pc:~/workspace/my-first-react-app$ npm start > test@0.1.0 start /home/cschroeter/workspace/my-first-react-app > react-scripts start (node:1863) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): TypeError: "listener" argument must be a function (node:1863) DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code. ``` ### Environment Run these commands in the project folder and fill in their results: 1. `npm ls react-scripts` (if you haven’t ejected): ``` cschroeter@pc:~/workspace/my-first-react-app$ npm ls react-scripts my-frist-react-app@0.1.0 /home/cschroeter/workspace/my-frist-react-app └── react-scripts@0.9.4 ``` 2. `node -v`: ``` v7.7.2 ``` 3. `npm -v`: ``` 4.3.0 ``` Then, specify: 1. Operating system: Windows 10 in Linux Bash Shell Build 15048 (Creator Update) ### To Reproduce ``` $ create-react-app my-first-react-app $ cd my-first-react-app $ npm start ```