title: You are running the esm-bundler build of vue-i18n. It is recommended to configure your bundler to explicitly replace feature flag globals with
body: <p>I have created an ionic app and added vue-i18n.</p>
  <pre><code>npx ionic start myapp tabs --type vue
  npm install vue-i18n@next
  </code></pre>
  <p>I did the very first step of the VueI18n setup and added this to &quot;./src/main.ts&quot;:</p>
  <pre><code>import { createI18n } from 'vue-i18n';
  
  const i18n = createI18n({
    locale: 'de',
    fallbackLocale: 'en',
    messages: {en: {testMessage: 'Test message'}, de: {testMessage: 'Testnachricht'}}
  });
  </code></pre>
  <p>When looking at the result after <code>npx ionic serve</code> I get the following warning in the browser console:</p>
  <blockquote>
  <p>You are running the esm-bundler build of vue-i18n. It is recommended to configure your bundler to explicitly replace feature flag globals with boolean literals to get proper tree-shaking in the final bundle.</p>
  </blockquote>
  <p>And I get this info in the browser console:</p>
  <blockquote>
  <p>You are running a development build of vue-i18n.
  Make sure to use the production build (*.prod.js) when deploying for production.</p>
  </blockquote>
  <p>When I comment out the snippet added to &quot;./src/main.ts&quot; both the notifications disappear. So they really seem to be caused by vue-i18n.</p>
  <p>After asking Google I still don't know what to do about these notifications. What are they telling me? Should I do something about them? What can I do specifically?</p>
  <p>These are the files that were automatically created in the root folder of the new project:</p>
  <pre><code>./ionic.config.json
  ./cypress.json
  ./jest.config.js
  ./babel.config.js
  ./.gitignore
  ./package-lock.json
  ./package.json
  ./.eslintrc.js
  ./tsconfig.json
  ./capacitor.config.json
  ./.browserslistrc
  </code></pre>
  <p>Please also tell me <em>where</em> I would need to change something. Also</p>
  <pre><code>$ find . -type f ! -name package-lock.json -maxdepth 1 -exec grep -iH webpack {} \;
  ./tsconfig.json:      &quot;webpack-env&quot;,
  </code></pre>
  <p>so I will not know what to do if you tell me to &quot;just set up webpack properly&quot;.</p>