You are running the esm-bundler build of vue-i18n

[Roman Vašek]

How to get rid of this error?
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.

[jojomatik]

I'm seeing this as well, but only during development mode. The production build does seem to work fine.

Also I wanted to add that the message is received in the browser console.

[Anbuselvan Annamalai]

I'm also seeing this error on the console.warn