Support pure ESM with .tsx

[maclockard]

Related to https://github.com/smeijer/unimported/issues/66.

Unfortunately pathTransforms doesn't seem to work well when dealing with both .ts and .tsx files.

With the new typescript module import path stuff, I believe that the import path needs to be written as whatever extension the built file will have. This means that both .ts and .tsx files will be built as .js files. Unfortunately, pathTransforms doesn't seem to support mapping .js files to multiple possible file extensions.

[maclockard]

I've ended up just stripping the extension entirely which appears to work?

"pathTransforms": {
  "(\\..+)\\.js$": "$1"
}

[smeijer]

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