## Summary
Fixes#21415.
Server-side `` t`…` `` macro calls (e.g. `FlatEntityMapsException`)
resolve against Lingui's global `i18n` singleton, which `I18nService`
never loads a catalog into and never registers a messages compiler on.
With no `_messageCompiler` set, every such lookup logs `Uncompiled
message detected!` and falls back to the raw string — flooding server
logs (enough to hit hosting log rate limits) and disabling ICU
interpolation on those messages. The warning is emitted unconditionally
by `@lingui/core` (not `NODE_ENV`-gated).
## Changes
Register `compileMessage` via `setMessagesCompiler` in
`I18nService.loadTranslations()`:
- on the global `i18n` singleton (used by the `t` macro), and
- on each per-locale instance.
`@lingui/message-utils` is already a transitive **runtime** dependency
of `@lingui/core` (`@lingui/core@5.1.2 → @lingui/message-utils@^5.1.2`),
so no new dependency is added.
## Testing
Deployed on a real instance: before, the server emitted hundreds of
`Uncompiled message detected` lines/sec (saturating the log rate limit);
after, steady-state shows `0`, and the worker (which shares the code
path) likewise shows `0`. App behaviour is unchanged — messages already
rendered via fallback; this silences the warning and enables ICU on the
affected messages.
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Félix Malfait <felix.malfait@gmail.com>
Co-authored-by: Félix Malfait <felix@twenty.com>
machinagod
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