yarnpkg start fails with two warnings

[foobarbecue]

If you are reporting a bug, please fill in below. Otherwise feel free to remove this template entirely.

Can you reproduce the problem with latest npm?

Yes.

Description

Note that this problem only happens with the latest npm, 7.7.2 . I have checked on 7.5.0 or 5.12.0 and the issue does not happen; create-react-app runs as expected on those older versions of node.

A freshly created create-react-app does not run in response to the yarnpkg start or npm start commands. Instead,

Expected behavior

Tell us what you think should happen.

Actual behavior

aaron@kubuntu1604:~/cratest$ npm start

> [email protected] start /home/aaron/cratest
> react-scripts start

(node:10728) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): TypeError: "listener" argument must be a function
(node:10728) 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.
aaron@kubuntu1604:~/cratest$

Then, pointing a browser to localhost:3000 gives ERR_CONNECTION_REFUSED.

If I downgrade my node version to 7.5.0, then I get a message saying "Compiled successfully!" and a browser opens.

Environment

Run these commands in the project folder and fill in their results:

1. npm ls react-scripts (if you haven’t ejected):

aaron@kubuntu1604:~/cratest$ npm ls react-scripts
[email protected] /home/aaron/cratest
└── [email protected] 

2. node -v: v7.7.2
3. npm -v: 4.3.0

Then, specify:

1. Operating system: Kubuntu 16.04, running on VMware on Windows 10
2. Browser and version: Chrome 58

[Timer]

Closing this in favor of #1776 since it has more information in the issue, they're duplicates. Thanks!

[gaearon]

0.9.5 is out with the fix.
https://github.com/facebookincubator/create-react-app/releases/tag/v0.9.5