How can I split type declarations into multiple files?

Question

I created a types package (@types/acme) that gets imported into multiple projects.

The type package currently declares all its types in a single index.d.ts and that works fine.

declare enum Device {  Desktop = "desktop",   Phone = "phone" }

declare enum Browser {  Firefox = "firefox",   Chrome = "chrome" }

How can I split the declarations from index.d.ts into multiple files so that the above declarations end up in devices.d.ts and browsers.d.ts ?

When splitting the declarations into their own files, they are recognized inside the types packages BUT they are no longer recognized by the projects that declare @types/acme as their dependency.

Later Edit: We are currently using an approach similar to https://github.com/types/sequelize where we explicitly import the types but I'm still wondering if there is a way to split de declarations and have them available in the projects as ambient types.