error TS5055: Cannot write file 'a.js' because it would overwrite input file.
  Adding a tsconfig.json file will help organize projects that contain both TypeScript and JavaScript files. Learn more at https://aka.ms/tsconfig.
error TS5056: Cannot write file 'a.js' because it would be overwritten by multiple input files.


!!! error TS5055: Cannot write file 'a.js' because it would overwrite input file.
!!! error TS5055:   Adding a tsconfig.json file will help organize projects that contain both TypeScript and JavaScript files. Learn more at https://aka.ms/tsconfig.
!!! error TS5056: Cannot write file 'a.js' because it would be overwritten by multiple input files.
==== a.ts (0 errors) ====
    class c {
    }
    
==== b.ts (0 errors) ====
    // this should be emitted
    class d {
    }
    
==== a.js (0 errors) ====
    function foo() {
    }
    