fix: use .mjs module exports

[angeloashmore]

Types of changes

• [ ] Chore (a non-breaking change which is related to package maintenance)
• [x] Bug fix (a non-breaking change which fixes an issue)
• [ ] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Description

This PR updates the module exports to use .mjs rather than .js. This fixes an issue with Next.js 12 when deploying to Vercel (note that the problem only occurs in production). See #108 for more details.

.mjs originally was not used because it broken CRA 4. CRA 5 includes updates that resolves this issue (most likely the change to Webpack 5).

Related issues:

• https://github.com/prismicio/prismic-react/issues/108
• https://github.com/vercel/next.js/issues/30750

Checklist:

• [ ] My change requires an update to the official documentation.
• [x] All TSDoc comments are up-to-date and new ones have been added where necessary.
• [x] All new and existing tests are passing.

[codecov-commenter]

Codecov Report

Merging #111 (c485fc1) into master (a2f2c23) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #111   +/-   ##
=======================================
  Coverage   92.16%   92.16%           
=======================================
  Files          16       16           
  Lines         268      268           
  Branches       59       59           
=======================================
  Hits          247      247           
  Misses          5        5           
  Partials       16       16           

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