# 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
Closes#5062.
Refactoring tables list to avoid rendering all toggles on each sync or
schema update while using fresh data:
- introducing id for RemoteTables in apollo cache
- manually updating the cache for the record that was updated after a
sync or schema update instead of fetching all tables again
