Cannot read property 'type' of undefined - upgrade react-scripts v3 to v4

[sagedemdreisbusch]

Hi,
we are currently facing a problem while upgrading react script from version 3.4.4 to 4.0.3. When starting the build or start-process of react-scripts, we see an compilation error like that:

Cannot read property 'type' of undefined
Occurred while linting <**>/src/components/shared/Grid/Grid.tsx:302

Our source code does not contain a .type in this part of the code. We already tried to install babel-eslint, @babel/eslint-parser as babel-eslint and updating typescript.

Has anyone got a solution for this problem?

Thx