topic Re: Types/Interfaces not accessible within extension? in CMS Development

Types/Interfaces not accessible within extension?

MSundman — Tue, 15 Jul 2025 18:38:54 GMT

So, we're using the UI extensions with typescript. And noticing that no types or interfaces are accessible outside of the file they're exported from.

i.e. we have a file with an exported type (or interface) like this:

```

# /component/Breadcrumb/BreadCrumbItem.ts

export type BreadcrumbItem = {

label: string;

path: string;

}

```

and if we import it like this (regardless of whether we use import or import type)

```

# /component/Breadcrumb/Breadcrumb.tsx

import type { BreadcrumbItem } from './BreadcrumbItem';

```

We will always get an error like this:

components/Breadcrumb/Breadcrumb.tsx (5:9) "BreadcrumbItem" is not exported by "components/Breadcrumb/BreadcrumbItem.ts", imported by "components/Breadcrumb/Breadcrumb.tsx".

Has anyone else encountered this and found a workaround/solution?

Re: Types/Interfaces not accessible within extension?

Victor_Becerra — Wed, 16 Jul 2025 15:47:05 GMT

Hi @MSundman ,
Thank you for reaching out to the Community!
I'd like to invite some community members who are subject matter experts to join this conversation.
@ArisudanTiwari @SteveHTM @kosalaindrasiri - Would you be able to share any insights on this? Your expertise would be greatly appreciated.
Best,

Victor

Re: Types/Interfaces not accessible within extension?

kosalaindrasiri — Wed, 16 Jul 2025 17:17:00 GMT

Thanks for the mention @Victor_Becerra,.

Hey @MSundman,

Can you try to use .d.ts Files for Shared Types?

I mean, move shared types to a declaration file like types.d.ts and import them where needed.

You can also refer UI Extensions examples repo by Hubspot too.

https://github.com/HubSpot/ui-extensions-examples/tree/main

Regards,