JSDoc missing in published modules

The source code has nice JSDoc descriptions for things that are exported:

Lines 3 to 6 in 959c5b7

    
           /** 
        
            * Checks if the value is a primitive `string`. 
        
            * @param x The value to check 
        
            */

But they seem to be striped from the published modules:

https://unpkg.com/browse/succulent@0.18.1/build/types/string.js

And the published type definitions:

https://unpkg.com/browse/succulent@0.18.1/build/types/string.d.ts

So unfortunately you don't get the JSDoc descriptions in editor intellisense:

Can the build be configured to preserve these comments?

	/**
	* Checks if the value is a primitive `string`.
	* @param x The value to check
	*/