Prep for Release: source maps, types, prettier

[dimitropoulos]

We're starting to look more seriously into targeting a release. As we do that, we noticed that the library does not have all the necessary exports. The first commit in this PR fixes that. While doing that, I noticed that the linting was misconfigured -> it was always autofixing. So the next commit fixes that. Finally, the third commit just runs that autofixer and commits it.

[marckong]

LGTM!

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