Material-ui: Error Cannot find module '@material-ui/lab/Skeleton' after upgrading from 4.4.0 to 4.4.1

[doberkofler]

• [x] The issue is present in the latest release.
• [x] I have searched the issues of this repository and believe that this is not a duplicate.

Current Behavior 😯

After upgrading from 4.4.0 to 4.4.1, I get the following error message: node_modules/@material-ui/core/Grid/Grid.d.ts:4:33 - error TS2307: Cannot find module '@material-ui/lab/Skeleton'.

Your Environment 🌎

| Tech | Version |
| ----------- | ------- |
| Material-UI | v4.4.1 |
| React | 16.9.0 |
| Browser | Chrome 76 |
| TypeScript | 3.5.3 |
| etc. | |

[wilfredlopez]

Installing the @material-ui/lab solved problem for me.
npm i @material-ui/lab
yarn add @material-ui/lab

[iulian-radu-at]

Confirmed. It was solved for me also (for v4.4.1) with:
"@material-ui/core": "^4.4.1",
"@material-ui/lab": "^4.0.0-alpha.26",

[sublimator]

Just to pull in a type that it doesn't use ...
Oops

[oliviertassinari]

I can confirm the issue, this import is not supposed to be present:
https://github.com/mui-org/material-ui/blob/3f5c86b9236ac3f4e9a1fc14c864d5e4b95d4ba0/packages/material-ui/src/Grid/Grid.d.ts#L4

We should remove it.

[nstepien]

Did b968c9a375d2d71745fa0165ac0d8d77bef74bc6 fix it? Can we expect a hotfix release soon?

[oliviertassinari]

@MayhemYDG Yes, it should fix the issue. You can expect the fix to be released, before next Monday.

[oliviertassinari]

Thanks for the patience, the fix was released under v4.4.2.