疑似ローカリゼーション：実際の翻訳なしで i18n 対応をテスト

// Pseudo-localization transforms your source strings
// to simulate translation without real translators

// Original:
"Welcome to our application"

// Accented (simulates diacritics):
"[Ẁëľčöṁë ţö öüŕ àṗṗľïčàţïöñ]"

// Expanded (simulates text expansion ~30%):
"[Weeelcooomee tooo ouuur aaappliiicaaatiiioon]"

// Mirrored (simulates RTL layout):
"[noitacilppa ruo ot emocleW]"

// Brackets make untranslated strings immediately visible

// 1. Hardcoded strings (not wrapped in t())
// Pseudo strings have brackets/accents, so untranslated
// strings are immediately obvious in the UI

// 2. Text truncation
// Expanded text reveals buttons and labels that break
// when translations are longer than English

// 3. Layout issues
// Accented characters reveal font rendering problems
// RTL mode reveals directional layout bugs

// 4. Concatenation bugs
// "Hello " + name vs t('greeting', { name })
// Pseudo-localization breaks concatenated strings

// 5. Missing i18n wrappers
// Any string not going through the i18n system
// appears as plain English among pseudo text

// Strategy 1: Accented characters
// Replace ASCII with similar-looking Unicode
// a -> à, e -> ë, o -> ö, etc.
// Preserves readability while testing rendering

// Strategy 2: Text expansion
// Pad strings to simulate longer translations
// German is ~30% longer, Finnish ~40% longer
// Helps catch UI overflow early

// Strategy 3: Brackets/wrappers
// Wrap strings in [brackets] or «guillemets»
// Makes untranslated strings visually obvious

// Strategy 4: Bidi/RTL
// Mirror text for right-to-left testing
// Catches layout issues before Arabic/Hebrew testing

// Strategy 5: Combined
// Apply all strategies simultaneously
// Maximum coverage in one pass

// Using i18n-pseudo CLI
npx i18n-pseudo generate \
  --source locales/en.json \
  --output locales/pseudo.json \
  --preset accented

# Available presets:
# accented  - Ḣëľľö Ẁöŕľð (default)
# expanded  - Heeellooo Wooorld
# mirrored  - dlroW olleH
# brackets  - [Hello World]
# maximum   - [Ḣëëëľľľöööö Ẁöööŕŕŕľľľðððð]

// i18n-pseudo.config.json
{
  "source": "locales/en.json",
  "output": "locales/pseudo.json",
  "preset": "maximum",
  "expansion": 1.4,
  "wrapper": ["[", "]"],
  "exclude": [
    "*.url",
    "*.email",
    "branding.*"
  ]
}

# .github/workflows/pseudo-check.yml
name: Pseudo-Localization Check

on:
  pull_request:
    paths:
      - 'src/**'

jobs:
  pseudo-test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: 20

      - name: Install dependencies
        run: npm ci

      - name: Generate pseudo locale
        run: npx i18n-pseudo generate \
          --source locales/en.json \
          --output locales/pseudo.json \
          --preset maximum

      - name: Build with pseudo locale
        run: npm run build
        env:
          NEXT_PUBLIC_LOCALE: pseudo

      - name: Run visual regression tests
        run: npx playwright test --project=pseudo
        env:
          LOCALE: pseudo