4.0.0

Change

• c8de35b Change to require Node.js 16
  migrate: update Node
• a2b0653 Change to use export map
  migrate: don’t use private APIs
• cb88389 Update vfile

Misc

• 04a046a Refactor docs
• df5edab Refactor code-style
• ff86030 Refactor tsconfig.json
• 4c7764c Refactor package.json

Full Changelog: 3.1.0...4.0.0