b.ts(1,8): error TS18058: Default imports are not allowed in a deferred import.
b.ts(5,8): error TS18117: A deferred import must specify a namespace binding.
b.ts(6,8): error TS18117: A deferred import must specify a namespace binding.
c.js(2,8): error TS18117: A deferred import must specify a namespace binding.
c.js(3,8): error TS18117: A deferred import must specify a namespace binding.
d.js(1,8): error TS18117: A deferred import must specify a namespace binding.


==== a.ts (0 errors) ====
    export default function foo() {
        console.log("foo from a");
    }
    
==== b.ts (3 errors) ====
    import defer foo from "./a";
           ~~~~~~~~~
!!! error TS18058: Default imports are not allowed in a deferred import.
    
    foo();
    
    import defer "./a.js";
           ~~~~~
!!! error TS18117: A deferred import must specify a namespace binding.
    import defer "./a.js" with { type: "json" };
           ~~~~~
!!! error TS18117: A deferred import must specify a namespace binding.
    
==== c.js (2 errors) ====
    // @ts-check
    import defer "./a.js";
           ~~~~~
!!! error TS18117: A deferred import must specify a namespace binding.
    import defer "./a.js" with { type: "json" };
           ~~~~~
!!! error TS18117: A deferred import must specify a namespace binding.
    
==== d.js (1 errors) ====
    import defer "./a.js";
           ~~~~~
!!! error TS18117: A deferred import must specify a namespace binding.
    