Actually build the thing

.gitignore

@@ -46,3 +46,4 @@ fonts.tar.gz
 temp/
 
 /result
+.DS_Store

yarn-project.nix

@@ -117,6 +117,7 @@ let
       else
         # - If the package.json has a `files` field, only files matching those patterns are copied
         # - Otherwise all files are copied.
+        yarn build
         yarn pack --out package.tgz
         mkdir -p "$out/libexec/$name"
         tar xzvf package.tgz --directory "$out/libexec/$name" --strip-components=1