If you have errors because you are including .js in the end of your imports when using typescript, install this package by running

npm install --save-dev parcel-resolver-fix-ts-esm-shit

Then you will need to customize your .parcelrc with

{
  "extends": "@parcel/config-default",
  "resolvers": ["parcel-resolver-fix-ts-esm-shit", "..."]
}

Are you using javascript modules and typescript? Yeah, so now you have to put .js in the end of your imports, once it your code needs to be esm complaint.

This package takes your .js imports and checks if a .ts or .tsx exists, if true, parcel will use your typescript