fix: remove ESM `package.json` declaration (fixes `'Element' is not exported from '@prismicio/richtext'`)

[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 removes the explicit ES Module declaration by removing "type": "module" from package.json.

Declaring the package as an ES Module has caused issues in the following circumstances:

• Next.js on Vercel: The entry file must use the .mjs extension to resolve correctly during server-rendered requests. This causes issues in build systems that do not recognize .mjs (e.g. Create React App). This only happens when deployed to Vercel in production. (See #108)
• Create React App 4: .mjs files are unsupported. It works with a .js file extension, which breaks Next.js support.
• Create React App 5: .mjs with "type": "module" is supported, but breaks backwards compatibility with CRA 4.

The most straightforward solution that ensures everything works out-of-the-box is to remove "type": "module" from package.json. When the ecosystem is more aligned behind ESM, we can restore it to a proper ES Module.

Fixes #117

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 #122 (1b16476) into master (27c502f) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #122   +/-   ##
=======================================
  Coverage   92.25%   92.25%           
=======================================
  Files          16       16           
  Lines         271      271           
  Branches       60       60           
=======================================
  Hits          250      250           
  Misses          5        5           
  Partials       16       16           

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[github-actions[bot]]

size-limit report 📦

Path	Size
dist/index.mjs	0 B (-100% 🔽)
dist/index.cjs	5.74 KB (0%)
dist/index.js	4.08 KB (+100% 🔺)