Remove exists since underlying Async.exists was removed

[sigma-andex]

Description of the change

Update for purescript-node/purescript-node-fs#61

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Checklist:

• Added the change to the changelog's "Unreleased" section with a reference to this PR (e.g. "- Made a change (#0000)")
• Linked any existing issues or proposals that this pull request should close
• Updated or added relevant documentation
• Added a test for the contribution (if applicable)

[JordanMartinez]

🏓 @thomashoneyman

[thomashoneyman]

I’m not sure we can just replace the asynchronous exists with a liftAff over the synchronous one — @natefaubion, do you have any opinion on that?

Since you can call liftAff on any of these functions that run synchronously in Effect, I don’t think they need to be explicitly ported over to this library. Why not just remove this function altogether?

[natefaubion]

I agree with @thomashoneyman. Exporting this as Aff seems like a footgun.

[sigma-andex]

Ok I removed it again.

[JordanMartinez]

@sigma-andex Sorry about misleading you. I was focusing too much on preventing unneeded breakage rather than the other considerations Thomas brought up.

@thomashoneyman Looks like this PR is ready to be approved now.

[sigma-andex]

@sigma-andex Sorry about misleading you. I was focusing too much on preventing unneeded breakage rather than the other considerations Thomas brought up.

No worries!