halogenWorld: a simple purs-nix hello world for web apps using halogen

I am trying to get the very simple code here to work with purs-nix and having NO success whatsoever. It runs fine when I paste it here but doesn't work when I try to run it with purs-nix like I am in this repo.

Here's the current error message that is confusing me. It seems to indicate that I don't have npm connected/working properly. Since this project is to be entirely flake managed, everything should be handled in the flake which is is based heavily on the flake outputs here. I'm stuck at hello world, using purs-nix.....Not an encouraging sign of the purs-nix tooling as it stands today.

file:///.../halogenWorld/output/Effect.Aff/foreign.js:530
                throw util.fromLeft(step);
                ^
                
ReferenceError: window is not defined
    at windowImpl (file:///.../halogenWorld/output/Web.HTML/foreign.js:2:3)
    at file:///.../halogenWorld/output/Effect/foreign.js:10:16
    at file:///.../halogenWorld/output/Effect/foreign.js:10:16
    at __do (file:///.../halogenWorld/output/Halogen.Aff.Util/index.js:45:119)
    at runAsync (file:///.../halogenWorld/output/Effect.Aff/foreign.js:96:20)
    at run (file:///.../halogenWorld/output/Effect.Aff/foreign.js:331:22)
    at file:///.../halogenWorld/output/Effect.Aff/foreign.js:637:15
    at drain (file:///.../halogenWorld/output/Effect.Aff/foreign.js:118:9)
    at Object.enqueue (file:///.../halogenWorld/output/Effect.Aff/foreign.js:139:11)
    at Object.run (file:///.../halogenWorld/output/Effect.Aff/foreign.js:636:23)
    3)

Node.js v18.16.0