Package.json must be exported for React Native on Node >=14

[heysailor]

Bug report

Description / Observed Behavior

When imported for a React Native project build on Node >=14, the following warning is displayed:
warn Package swr has been ignored because it contains invalid configuration. Reason: Package subpath './package.json' is not defined by "exports" in <path...>/node_modules/swr/package.json

This occurs as the SWR package.json file is not included in the exports field of package.json. This is a known quirk of using React Native on Node 14, and is under discussion by the community here.

An easy fix is to add package.json to the exports field of the same package.json file.

Expected Behavior

It would be handy if SWR just exported its own package.json file - PR to follow.

Additional Context

SWR version:1.0.0-beta.9