-r esm not working with uvu CLI

Nobody has claimed this yet.

Playing around with uvu tonight, I have a command that works with `node`, but doesn't work with the `uvu` CLI:

- Works: `node -r esm -r ../app-scripts-svelte/test/register.js ./src/App.test.js`
- Doesn't work: `yarn run uvu -r esm -r ../app-scripts-svelte/test/register.js src`
- Doesn't work: `../../node_modules/.bin/uvu -r esm -r ../app-scripts-svelte/test/register.js src` (run in a monorepo, if that matters)

Error:
```
... app-template-svelte/src/App.test.js:1
(function (exports, require, module, __filename, __dirname) { import { test } from 'uvu';
^^^^^^

SyntaxError: Cannot use import statement outside a module
```

Can confirm that putting random string in place of `esm` (`-r eawegiawingeawniegain`) causes a different error, so esm seems to be running but having no effect.

This is on the latest version from npm

Based loosly on https://github.com/lukeed/uvu/tree/master/examples/svelte

Reproduce the three reported commands, including the monorepo invocation, and inspect the uvu CLI entry point and its handling of Node’s -r options. Done means the CLI loads esm and the register.js hook so the reported App.test.js import runs without the SyntaxError.

Written by the indexing model from the issue text.