I wish to use an ES2015 module for a project. Per [the node documentation, I am enabling the `.esm` loader](https://nodejs.org/docs/latest-v10.x/api/esm.html):

```
~\Code\spa-test $ node --experimental-modules                                                                           (node:8104) ExperimentalWarning: The ESM module loader is experimental.                                               

> import * as sapper from '@sapper/server';                                                                             Thrown:
import * as sapper from '@sapper/server';
       ^

SyntaxError: Unexpected token *

```

I have also tried:

```
import {middleware} from '@sapper/server';

```

Which fails with `SyntaxError: Unexpected token {`

How do I make node.js load the `@sapper/server` ESM module?