Hack in a package.yaml instead of package.json

json is just incredibly tedious to use for this, especially because of
lack of comments.

Upstream has been informed of this many times apparently, npm won't
change it. Just hack it downstream.

npm will never get better, will it...

nix/package.nix

@@ -5,7 +5,21 @@
 }: let
   inherit (pkgs.lib) cleanSource;
 
+  packageJson =
+    pkgs.runCommand "package.json" {
+      nativeBuildInputs = with pkgs; [yj];
+      src = "";
+    } ''
+      cat ${self}/package.yaml | yj > $out
+    '';
+
+  prePatch = ''
+    ln -s ${packageJson} package.json;
+  '';
+
   node_modules_attrs = {
+    packageJson = "${packageJson}";
+
     # Dependencies that should be available in the node build
     buildInputs = with pkgs; [
       pkg-config
@@ -21,7 +35,7 @@
   ];
 in {
   package = pkgs.npmlock2nix.build {
-    inherit buildInputs node_modules_attrs;
+    inherit buildInputs prePatch node_modules_attrs;
 
     src = cleanSource self;
 
@@ -33,14 +47,22 @@ in {
   };
 
   shell = pkgs.npmlock2nix.shell {
-    inherit buildInputs node_modules_attrs;
+    inherit buildInputs prePatch node_modules_attrs;
 
     src = nix-filter {
       root = self;
       include = [
-        "package.json"
+        "package.yaml"
         "package-lock.json"
       ];
     };
+
+    shellHook = ''
+      if [ -e package.json ]; then
+        unlink package.json
+      fi
+
+      ln -s ${packageJson} package.json
+    '';
   };
 }