Hybrid npm package (CommonJS and ESM)

[frenzzy]

Types of changes

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

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

Read more: https://2ality.com/2019/10/hybrid-npm-packages.html

[codecov-commenter]

Codecov Report

Merging #20 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #20   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          127       127           
  Branches        35        35           
=========================================
  Hits           127       127           

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