Add comment that can fix TypeScript errors with Yarn

[spidgorny]

With Yarn 2 TypeScript can't find @types/... files in node_modules (because it does not exist). This is a workaround for such situation.

Changes

Testing

Docs

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[FredKSchott]

Yarn v2 really doesn't support @types? That's pretty surprising!

More for style than anything, I'd like to move this note from the config file to the README. Mind moving it to a note in the README?

[spidgorny]

Which readme? This one?
https://github.com/snowpackjs/snowpack/blob/main/create-snowpack-app/app-template-react-typescript/README.md

[spidgorny]

Typescript does not support yarn 2 folder structure directly.
Issue: microsoft/TypeScript#28289
More info: https://medium.com/swlh/getting-started-with-yarn-2-and-typescript-43321a3acdee

[FredKSchott]

Yup, that's the readme that every start application gets (and a good place to leave notes for people after they initialize the template)

[melissamcewen]

Hey @spidgorny if you add it to the readme, you can convert from draft, assign me as a reviewer and I'll merge it

[spidgorny]

you can convert from draft

Not sure what you mean with that. Anyway, I've tried to explain the situation and a workaround in the README.

@melissamcewen, please check.

[FredKSchott]

Thanks for the contribution @spidgorny, LGTM!