when i exec `yarn start` , it will throw a error !!!

[littleLane]

Is this a bug report?

It can't be nice after i operate according to the steps, it will throw a error that

.../nervjs-typescript/node_modules/@types/react-dom/node_modules/@types/react/index.d.ts
(3631,13): 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>'.

Environment

1. node -v: 6.11.3
2. npm -v: 5.7.1
3. yarn --version : 1.2.0

Steps to Reproduce

1. create-react-app nervjs-typescript --scripts-version=react-scripts-ts
2. cd nervjs-typescript
3. yarn start

[tiagovtristao]

I was actually about to post this same issue!

I tried different environments, namely:

1. node / npm => 8.10.0 / 5.6.0
2. node / npm => 7.10.1 / 4.2.0
3. node / npm => 6.9.1 / 3.10.8

I've been noticing this problem in other projects too recently. And I come to think that the react types are the source of the problem. Basically, it seems that if your project depends on it and one of your dependencies does as well, it will throw this error.

[kigorw]

@littleLane, @tiagovtristao
yarn add @types/react-dom@16.0.4 fixes the problem

[ptommasi]

I had the same issue, for some odd reason, in the latest create-react-app script, in the generatedpackage.json the property @types/react-dom has been downgraded from ^16.0.3 to ^15.5.7 , which seems to cause the error.

[nottoseethesun]

For me, the only thing that worked (this is using npm not yarn), was this:

	rm -rf node_modules/@types/react-dom
	npm upgrade --save @types/react-dom

[robertmassaioli]

I just modified the react-dom dev dependency to be 16.0.4 from 15.5.7 as @kigorw said, performed a yarn install followed by a yarn start and everything started working. Nice suggestion! The project should be fixed to bump that dependency.

[littleLane]

Thanks，it started working as @kigorw said!
@tiagovtristao @ptommasi you can do that make it starts working!

[littleLane]

I pulled a request to resolve the error!!

[DorianGrey]

I'm afraid that fix won't fix anything - esp. since it only updates this project's development dependencies...
This problem seems to reside somewhere else. The init script of react-scripts-ts installs @types/react-dom without any version suffix. When doing this manually, I'm getting this... (checked on a project without any further react dependency, npm 5.6.0).

npm i -D @types/react-dom
+ @types/react-dom@15.5.7
removed 1 package and updated 2 packages in 10.079s

This is not the latest version, and is definitely an extremely curious behavior. However, it does not seem to be related to create-react-app-typescript.

[sebald]

Enabling skipLibCheck in your tsconfig.json should fix this.

[smitthakkar1]

@sebald it worked but can you please explain why it worked?

edit: I saw it skip type checking of all declaration files. Is it harmful or doesn't make any difference?