fail to alias assets in node_modules

[MoonBall]

Follow steps as below:

1. npx create-snowpack-app snowpack-react --template @snowpack/app-template-react --use-yarn
2. cd snowpack-react
3. yarn add @fortawesome/fontawesome-free
4. add alias in snowpack.config.json, see the code
5. use alias in src/App.jsx, see the code
6. yarn start

browser will throw a Error Uncaught TypeError: Failed to resolve module specifier "react". Relative references must start with either "/", "./", or "../"., see the image as below.

PTAL @FredKSchott @drwpow.

[MoonBall]

I made a PR #801 to fix the bug. I realize that I don't make the background of this PR clear. So I create a new discussion here.

[FredKSchott]

Ohhhh I see now, you want to create an alias to a folder within a package. Thanks for the discussion to clarify.

Yes, this could be useful. We're trying to get v2.8 out now, but can get this reviewed after that goes out.

Thanks for the contribution!