What's up with "import declarations may only appear at top level of a module"

So SpiderMonkey 52 supports ES6, and we're embedding the TypeScript 
compiler.  I got that part working but I get an error compiling the 
compiled scripts.

"compilation exception: import declarations may only appear at top level 
of a module: file: , line: 1"

This is my test program:

import Add from "./TSTest2";
let x:string='Hello from Typscript\n';

print_doc(x + Add(2,2).toString() + '\n');
// cause_an_error;

And this is the module it's trying to import:

export default function Add(x: number, y:number): number {
      return x + y;
}

When I google that error message, all the references to <script> tags in 
client side JS.  How do I get a server-side SpiderMonkey interpreter to 
not throw that error.


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