fix: cannot find declaration file issue

[ColniIIIko]

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Description

Fix #93

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[samesfahani-tuplehealth]

I could be wrong -- but this solution felt incomplete. It is using one typing file while trying to serve cjs and mjs.

See:

https://github.com/arethetypeswrong/arethetypeswrong.github.io/blob/main/docs/problems/FalseCJS.md#common-causes
https://arethetypeswrong.github.io/?p=react-square-web-payments-sdk%403.2.1