# 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
As a follow-up of https://github.com/twentyhq/twenty/pull/9304, we are
here creating a migration to run at the next release, aiming at adding
the new aggregate operation options (CountEmpty, CountNotEmpty, ...,
PercentEmpty, PercentNotEmpty) to the enums on View and ViewField's
aggregateOperations fields.
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Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>
