# 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
Split from https://github.com/twentyhq/twenty/pull/4518
- Upgrades dependencies and applies automatic config migrations with the
command: `npx nx migrate nx` (see
https://nx.dev/nx-api/nx/documents/migrate)
- Fixes lint errors after upgrading `@typescript-eslint`
Note: it was not possible (for now) to migrate Nx to the latest stable
version (v18.2.1) because it upgrades Typescript to v5.4.3, which seems
to cause a bug on install when Yarn tries to apply its native patches.
Might be a bug on the Yarn side.
