`unknown` type in an `await` helper

[kaermorchen]

Hello. First of all, thank you for the awesome addon.

I catch one error when use await helper.

{{#each (await this.commonData.languages) as |item|}}
    <NavLink @route="languages.language" @title={{item.name}} @model={{item}}/>
{{/each}}

The error is Property 'name' does not exist on type 'unknown'.typed-templates

this.commonData.languages return a promise.

I don't use TypeScript.