Original TypeScript source files are included in the published tarball

[TrevorBurnham]

When installing web-vitals, the original .ts TypeScript source files are included. Steps to reproduce:

curl -L $(npm view web-vitals dist.tarball) -o web-vitals.tgz
tar -tzf web-vitals.tgz | grep "\.ts$" | grep -v "\.d\.ts$"

It's a minor issue, but I'm trying to do my part to make the JS ecosystem a bit lighter. Let me know if you'd like me to send over a PR.

Obligatory meme:

[tunetheweb]

@philipwalton can you explain your thinking here?

I know some users (e.g. DevTools) do use these source files, though that's not really supported.