Replace parcel with tsup. Better types, better tsconfig. Move to ESM.

[sneridagh]

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[davisagli]

@sneridagh What does adding type in the imports do?

[sneridagh]

@davisagli type declares the import "Typescript only", so the interpreter knows that it does not belong to the code, so it strips it on build time when transpiling. It's a best practice nowadays. This is enforced by the tsconfig option "verbatimModuleSyntax".

I'm trying to come up with a golden tsconfig for all our browser libs, then one for the Node ones. I think we are near.

[davisagli]

@sneridagh So the type system can't even tell which things are types without giving manual hints? Pssh.

[sneridagh]

@davisagli it can, but sometimes it seems it has a hard time doing it, so it's better to explicit tell him :) It kind of makes sense in a bundler world!