# 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
Fix all the broken CIs :p
This includes an ongoing effort to simplify test maintenance by having 1
unique source of truth about metadata and data mocks (that will later be
generated from a unique source of seeds: dev = demo = test)
Regressions:
- Unit line coverage: 60 > 55
- Storybook Pages branch coverage: 40 > 35
We will need to write tests to increase those coverage
- RelationFieldDisplay perf: 0.2ms to 0.22ms > We might have a
regression here
- Removed perf story about RawJSON > We will need to re-add it
