mod2.js(1,23): error TS2300: Duplicate identifier 'Foo'.
mod2.js(3,4): error TS2300: Duplicate identifier 'Foo'.


==== mod2.js (2 errors) ====
    /** @typedef {number} Foo */
                          ~~~
!!! error TS2300: Duplicate identifier 'Foo'.
!!! related TS6203 mod2.js:3:4: 'Foo' was also declared here.
    const ns = {};
    ns.Foo = class {}
       ~~~
!!! error TS2300: Duplicate identifier 'Foo'.
!!! related TS6203 mod2.js:1:23: 'Foo' was also declared here.
    module.exports = ns;