How to include ambient module declarations inside another ambient module?

Question

I have an ambient .d.ts module which directly depends on Immutable:

/// 

        

Answer 1

Ambient external modules cannot be nested in other modules.

Using an import or export at the root of a file creates a file module. That explains the error nested module.

Fix: Import inside and not at the root of the file:

/// 

declare module 'morearty' {
    import I = require('immutable');
}