To make it work I had to copy locally the file vue-i18n-composable/src/index.ts

[stephane303]

I think there is something wrong in the way you export the module to npm.

I had the following error:

[vue-composition-api] must call Vue.use(VueCompositionAPI) before using any function.

Even though I followed your instructions, and Vue.use(VueCompositionAPI) was called. I think a new Vue instance was created.

The only way I could make the module work is to copy locally the file.

It might be related to #9

My setup:

@vue/[email protected]
[email protected]