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*.d.ts files are never included in the output. You can read this GitHub issue debate for reasons why. You probably want to just type it as a normal .ts file and import it where needed.
TypeScript doesn't have an option to bundle output definition files and it should be fine to have one index.d.ts that then imports other definition files, but if you want to fix that for encapsulation reasons or to better control the API surface, I believe there is a rollup plugin for that (rollup-plugin-dts).