purescript & spago should be an optional dependency in package.json

[toastal]

Or possibly dropped altogether with the implication that the user should have installed it already? By default, just installing PureScript through generic NPM is incompatible with Nix (because of dynamic linking, hence why easy-purescript-nix exists). Users may also be getting their PureScript binary from other avenues like asdf or Docker or the OS.

I am trying to add this upstream to nixpkgs. I'm starting to ./generate.sh it, but I have a feeling it may fail because of this requirement (and even if it does work, it's kinda wasteful to download and not use the binary specifically).

[i-am-the-slime]

I'd be happy to merge a PR that moves purescript (and spago?) to optionalDependencies if it helps nix users.

[i-am-the-slime]

@toastal Also currently I haven't worked much with the non-prettier integration/standalone formatter, it's quite possible that we can improve the feature set here by providing more flags and ways of reading and writing output.

[toastal]

The documentation could say that you should install PureScript and Spago or use npx to download them.