b.ts(1,10): error TS2616: 'Foo' can only be imported by using 'import Foo = require("./a")' or a default import.


==== a.ts (0 errors) ====
    class Foo {}
    export = Foo;
    
==== b.ts (1 errors) ====
    import { Foo } from './a';
             ~~~
!!! error TS2616: 'Foo' can only be imported by using 'import Foo = require("./a")' or a default import.