beta.11 regression: I18N interface no longer has an `install`function

vue & vue-i18n version

ex:

• vue: 3.0.4
• vue-i18n: 9.0.0-beta.11

Reproduction Link

https://github.com/cexbrayat/vue-cli-playground/pull/2

Steps to reproduce

yarn and yarn serve throws:

TS2345: Argument of type 'I18n<{ en: { hello: string; }; }, unknown, unknown, true>' is not assignable to parameter of type 'Plugin_2'.
  Property 'install' is missing in type 'I18n<{ en: { hello: string; }; }, unknown, unknown, true>' but required in type '{ install: PluginInstallFunction; }'.
    4 |
    5 | createApp(App)
  > 6 |   .use(i18n)
      |        ^^^^
    7 |   .mount('#app')

Unit tests also fail.

It appears that the I18n interface used to have an install property, but no longer has one in beta.11.

What is Expected?

We should be able to use the i18n plugin with TS

What is actually happening?

We can’t use the plugin as it does not compile with beta.11

[kazupon]

I’ve just released out 9.0.0-beta.12 fixed i18n interface install type missing. please check it!

[meddario]

Hi, this seems still relevant with version 9.0.0-beta.16:

Argument of type '{ i18n: I18n<{ en: { message: { hello: string; }; }; it: { message: { hello: string; }; }; }, unknown, unknown, true>; }' is not assignable to parameter of type 'Plugin_2'.
  Property 'install' is missing in type '{ i18n: I18n<{ en: { message: { hello: string; }; }; it: { message: { hello: string; }; }; }, unknown, unknown, true>; }' but required in type '{ install: PluginInstallFunction; }'.ts(2345)
runtime-core.d.ts(889, 5): 'install' is declared here.

Is there any workaround?