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simple-react-app-kit/packages/i18n/docs/en-US/advanced/catalogs.mdx
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---
title: Production catalogs
description: Understand merging, compact message keys, asset generation, and SSR behavior.
order: 20
toc:
- id: merge-order
title: Merge order
- id: build-output
title: Build output
- id: server-rendering
title: Server rendering
---
## Merge order {#merge-order}
Package sources are merged in configured order, followed by the application catalog. An application therefore translates only its own messages unless it intentionally customizes package copy.
> Import only the locale sources used by the application. Block-specific entries do not import catalogs from unrelated features.
## Build output {#build-output}
During production builds, the plugin:
1. merges configured catalogs for every locale;
2. creates one shared schema from semantic message IDs;
3. replaces those IDs with deterministic compact keys;
4. emits one content-hashed JSON asset per locale.
The private schema is diagnostic build state and is not shipped to the browser.
## Server rendering {#server-rendering}
The SSR bundle embeds the matching compact catalog. Browser navigation loads only the selected locale asset, so adding languages does not duplicate every translation in the main application bundle.