## Problem
Syncing a `twenty-sdk` app against a server (`twenty dev`) **crashes the
server process**. The metadata migration completes, then the server-side
`GqlTypeGenerator` regenerates typed clients via the vendored genql
codegen in `twenty-client-sdk`, which throws and exits node:
```
ConfigError: Couldn't find plugin for AST format "estree".
Plugins must be explicitly added to the standalone bundle.
at .../packages/twenty-client-sdk/dist/generate.cjs
Node.js v24.5.0 ← process exits
```
The CLI sees `ECONNRESET`; the app row still persists because the crash
happens after the metadata commit. Any app sync takes the server down.
## Root cause
The genql codegen formatter
[`prettify.ts`](https://github.com/twentyhq/twenty/blob/main/packages/twenty-client-sdk/src/generate/genql/helpers/prettify.ts)
was vendored (in #21339) targeting **prettier 2.8**: a synchronous
`format()` and `prettier/parser-typescript`, which in 2.8 bundles the
estree printer. `package.json` pins `prettier ^2.8.8`, but the monorepo
actually resolves/bundles **prettier 3.8.3** (`^2.8.8` is silently
unsatisfied — no 2.8.x is nested for this package, and the subpath
imports are bundled from the hoisted 3.8.3). Under prettier 3 the estree
printer must be added explicitly (`prettier/plugins/estree`) and
`format()` is async — so the codegen throws.
`prettier/parser-typescript` / `parser-graphql` don't even exist in
prettier 3 (only `prettier/plugins/*`), so the declared `^2.8.8` was
already inconsistent with what runs.
## Fix
- `prettify`: switch to the prettier-3 entrypoints
`prettier/plugins/{graphql,typescript,estree}`, `await` the async
`format()`, and fall back to the unformatted (still valid) code on any
failure so cosmetic formatting can never crash codegen again.
- `RenderContext.toCode` + `clientTasks`: propagate the now-async
`prettify` (await the four `toCode` call sites).
- Bump the declared `prettier` dependency `^2.8.8 → ^3.8.3` to match
what is actually used (only consumer; minimal lockfile diff).
## Verification (local, source server on :3000)
- `twenty dev --once` now completes: `Registering application → Syncing
manifest → Generating API client → ✓ Synced` with the **server staying
up**.
- The app integration test passes (full re-sync of 6 metadata objects +
`MetadataApiClient`/`CoreApiClient` CRUD through the generated genql
runtime).
- `nx build twenty-client-sdk` (incl. `tsgo` typecheck) passes.
Release note: this is a v2.11 blocker — without it, installing/syncing
any app crashes the server.
Charles Bochet
4305a7dc84