# Introduction
Avoid having multiple `isDefined` definition across our pacakges
Also avoid importing `isDefined` from `twenty-ui` which exposes a huge
barrel for a such little util function
## In a nutshell
Removed own `isDefined.ts` definition from `twenty-ui` `twenty-front`
and `twenty-server` to move it to `twenty-shared`.
Updated imports for each packages, and added explicit dependencies to
`twenty-shared` if not already in place
Related PR https://github.com/twentyhq/twenty/pull/9941
In this PR I'm optimizing a whole RecordTableCell in real conditions
with a complex RelationFieldDisplay component :
- Broke down getObjectRecordIdentifier into multiple utils
- Precompute memoized function for getting chip data per field with
useRecordChipDataGenerator()
- Refactored RelationFieldDisplay
- Use CSS modules where performance is needed instead of styled
components
- Create a CSS theme with global CSS variables to be used by CSS modules
