Property 'a' must be of type 'DetailedHTMLProps<AnchorHTMLAttributes<HTMLAnchorElement>, HTMLAnchorElement>'

[jeffarese]

Is this a bug report?

Yes

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

Yes. I first tried with 5.6.0, then with 4.2.0, then with 6.2.0

Which terms did you search for in User Guide?

Initial build, Failed to compile

Environment

1. npm ls react-scripts-ts (if you haven’t ejected): [email protected]
2. node -v: v8.10.0
3. npm -v: 5.6.0
4. yarn --version (if you use Yarn): 1.7.0
5. npm ls react-scripts-ts (if you haven’t ejected): [email protected] (again)

Then, specify:

1. Operating system:

• Antergos

• Kernel: x86_64 Linux 4.16.13-1-ARC

2. Browser and version (if relevant):
   Chrome Version 68.0.3440.15 (Official Build) dev (64-bit), but it's not relevant.

Steps to Reproduce

(Write your steps here:)

1. create-react-app project-name --scripts-version=react-scripts-ts
2. cd project-name
3. yarn start or npm run start

Expected Behavior

It should compile the app.

Actual Behavior

(2248,13): Subsequent property declarations must have the same type.  Property 'a' must be of type 'DetailedHTMLProps<AnchorHTMLAttributes<HTMLAnchorElement>, HTMLAnchorElement>', but here has type 'DetailedHTMLProps<AnchorHTMLAttributes<HTMLAnchorElement>, HTMLAnchorElement>'.nchorElement>', but here has type 'DetailedHTMLProps<AnchorHTMLAttributes<HTMLAnchorElement>, HTMLAnchorElement>'.

Reproducible Demo

[alex-ketch]

@jeffarese I've encountered the same warning before, and it was due to conflicting versions of @types/react or @types/react-dom.
You can check if that's the case by running yarn list @types/react* inside your project

[jeffarese]

So what was happening is that I don't know why but there was a package.json and a node_modules folder in my home folder, and the npm run start was trying to use that (hence the /home/user/node_modules) instead of home/user/path-ro-repo/node_modules.

Deleting this package.json and node_modules (even them being outside the project folder) solved the issue.