title: Why is Flutter not generating the internationalization files?
body: <p>I'm trying to follow the internationalization documentation in <a href="https://flutter.dev/docs/development/accessibility-and-localization/internationalization#dart-tools" rel="noreferrer">https://flutter.dev/docs/development/accessibility-and-localization/internationalization#dart-tools</a> and <a href="https://docs.google.com/document/d/10e0saTfAv32OZLRmONy866vnaw0I2jwL8zukykpgWBc/edit#heading=h.upcu5w85cvc2" rel="noreferrer">https://docs.google.com/document/d/10e0saTfAv32OZLRmONy866vnaw0I2jwL8zukykpgWBc/edit#heading=h.upcu5w85cvc2</a> but it's not generating any files.</p>
  <p>Basically it says to make these mods to the pub <code>spec.yaml</code> file:</p>
  <pre><code>dependencies:
    flutter:
      sdk: flutter
    flutter_localizations:
      sdk: flutter
    intl: ^0.17.0-nullsafety.2
  flutter:
    generate: true
  </code></pre>
  <p>Then create a <code>&lt;project-root&gt;/l10n.yaml</code> file containing:</p>
  <pre><code>arb-dir: lib/l10n
  template-arb-file: app_en.arb
  output-localization-file: app_localizations.dart
  </code></pre>
  <p>And finally to create the <code>app_en.arb</code> with something like this:</p>
  <pre><code>{
    &quot;@@locale&quot;: &quot;en&quot;,
  
    &quot;helloWorld&quot;: &quot;Hello World!&quot;,
    &quot;@helloWorld&quot;: {
      &quot;description&quot;: &quot;The conventional newborn programmer greeting&quot;
    }
  }
  </code></pre>
  <p>And from there the guides say that a <code>flutter_gen/gen_l10n/app_localizations.dart</code> file will be automatically generated.</p>
  <p>Except that nothing happens. I'm working in Android Studio and did a <code>pub get</code>, and tried a <code>flutter clean</code> and <code>flutter build ios</code> and everything else I can't think of but nothing is building that file.</p>
  <p>Any ideas?</p>