Types Error when run yarn build or tsc commands

Issue

When I try build project or run yarn tsc command I get some types error. Why this can happen? It looks like it is installing them in the wrong place. But why this can happen. I can give more detail if you need. [![enter image description here][2]][2]

Solution

You have multiple versions of react type definitions installed. Notice the two different roots of node_modules highlighted in the image below:

Fix

You need to uninstall one of them otherwise the two definitions will conflict giving errors (as you have noticed).

Answered By - basarat