index.js(6,1): error TS2309: An export assignment cannot be used in a module with other exported elements.
index.js(8,16): error TS2339: Property 'additional' does not exist on type 'Foo'.


==== index.js (2 errors) ====
    class Foo {
        static stat = 10;
        member = 10;
    }
    
    module.exports = new Foo();
    ~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2309: An export assignment cannot be used in a module with other exported elements.
    
    module.exports.additional = 20;
                   ~~~~~~~~~~
!!! error TS2339: Property 'additional' does not exist on type 'Foo'.