---

name: ampel-i18n description: Internationalize and localize applications using ampel-i18n-builder. Use when the user wants to (1) extract translatable strings from source code, (2) refactor code to automatically replace hardcoded strings with i18n calls, (3) add multi-language support to a project, (4) translate an app into multiple languages, (5) generate i18n translation files, (6) check translation coverage or find missing translations, (7) sync translations across locales, or when user types /ampel-i18n:localize. Supports React/TypeScript (JSON), Rust (YAML), and Java/Spring (.properties).

ampel-i18n

Automate internationalization (i18n) and localization (l10n) for any application using ampel-i18n-builder.

⚠️ PRE-FLIGHT CHECK (CRITICAL)

Before doing ANYTHING else, verify the tool is installed:

Copyampel-i18n --version
# OR
ampel-i18n --version

If Command Not Found:

STOP and redirect the user:

"You need to install ampel-i18n-builder first. I've created a step-by-step installation guide at references/install-guide.md.

Would you like me to help you install it now? It takes about 5 minutes and I can guide you through each step."

Then offer to help install:

1. Check if Rust/Cargo is installed (cargo --version)
2. If missing, guide Rust installation (OS-specific commands)
3. Run cargo install ampel-i18n-builder
4. Verify with ampel-i18n --version

DO NOT proceed with commands if tool is not installed.

---

Quick Start (Tool Already Installed)

1. Check if configuration exists:

   • Look for .ampel-i18n.yaml in project root
   • Look for .env file with translation provider credentials

2. If no config exists, create one using the template in references/config-template.yaml

3. Run the appropriate command based on user needs

Essential Documentation:

• First-time install: references/install-guide.md ⬅️ Start here if new
• Quick start: references/getting-started.md
• Sample prompts: references/sample-prompts.md
• Full config reference: references/config-template.yaml

Commands

Workflow

For New Projects (With String Extraction)

Recommended automated workflow:

Copy# 1. Initialize configuration
ampel-i18n init

# 2. Extract translatable strings from your code
ampel-i18n extract \
  --source frontend/src \
  --patterns "*.tsx" "*.ts" \
  --format json \
  --output frontend/public/locales/en/extracted.json \
  --merge

# 3. Refactor code to use i18n calls
ampel-i18n refactor \
  --target frontend/src \
  --mapping frontend/public/locales/en/extracted.json \
  --namespace common

# 4. Translate to all languages
ampel-i18n sync

Or manual setup (without extraction):

1. Identify the i18n framework in use (i18next, react-intl, rust-i18n, etc.)
2. Locate existing translation files or create initial structure
3. Create .ampel-i18n.yaml configuration (see references/config-template.yaml)
4. Set up provider credentials in .env (see references/env-template.txt)
5. Run ampel-i18n sync to generate translations

For Existing Projects

1. Health check: Run ampel-i18n doctor to validate setup
2. Run ampel-i18n coverage to assess current state
3. Run ampel-i18n missing to identify gaps
4. Run ampel-i18n sync to fill in missing translations

Provider Setup

The tool uses a 4-tier fallback system. Configure at least one provider in .env:

Only one provider is required. The system falls through tiers as needed.

Supported Languages (27 total)

Simple codes (21): en, fr, de, it, ru, ja, ko, ar, he, hi, nl, pl, sr, th, tr, sv, da, fi, vi, no, cs

Regional variants (6): en-GB, pt-BR, zh-CN, zh-TW, es-ES, es-MX

RTL support: Arabic (ar), Hebrew (he) — handled automatically

Common Patterns

React/i18next project:

Copysource_locale: en
locales_dir: src/locales
file_format: json
namespaces: [common, auth, dashboard]

Rust project with rust-i18n:

Copysource_locale: en
locales_dir: locales
file_format: yaml
namespaces: [errors, validation, providers]

Vue/vue-i18n project:

Copysource_locale: en
locales_dir: src/i18n/locales
file_format: json

Type Generation

After syncing translations, generate type definitions for compile-time safety:

Copy# TypeScript
ampel-i18n generate-types --lang typescript --output src/types/i18n.d.ts

# Rust
ampel-i18n generate-types --lang rust --output src/i18n_types.rs