Using TypeScript to separate namespaces

tsconfig.json:

...
"module": "none"
...

file1.ts:

namespace Myns {
  type Mytype = number
}

file2.ts:

namespace Myns {
  let x: Mytype
         ^^^^^^ Error - unable to locate declaration in file1.ts
}

Why am I encountering an error when trying to use Mytype inside file2.ts without exporting it in file1.ts? I prefer not to export it. This issue arises with TS version 3.8.

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