Fixed missing package type

[tkvw]

See subject

[newbeea]

Need this pr in nuxt3

[benmccann]

This is not a valid fix.

These lines are incorrect:

  "main": "./main.js",
  "module": "./index.js",

Only one of them can have a .js extension. If you have "type": "module" then .js will be treated as ESM and if you don't then it will be treated as CJS. If you make this change to add "type": "module", then you should also change the packaging to make the main named main.cjs instead of main.js or else you're likely to break CJS users