In production artifacts for `18.x.x` `getCurrentFiber` can actually be injected as `null`. Updated `getComponentStack` and `onErrorOrWarning` implementations to support this. 
This directory contains code shared between several DevTools packages:
- /packages/react-devtools-core
- /packages/react-devtools-extensions
- /packages/react-devtools-inline
It is not published or released anywhere directly.