b.ts(1,19): error TS2307: Cannot find module 'a' or its corresponding type declarations.


==== a.ts (0 errors) ====
    export default function defer() {
        console.log("defer from a");
    }
    
==== b.ts (1 errors) ====
    import defer from "a";
                      ~~~
!!! error TS2307: Cannot find module 'a' or its corresponding type declarations.
    
    defer();