feat: nodejs: installMethod=copy by default for top-level packages

src/subsystems/nodejs/builders/granular/default.nix

@@ -307,7 +307,15 @@
           '';
         };
 
-        installMethod = "symlink";
+        /*
+         For top-level packages install dependencies as full copies, as this
+         reduces errors with build tooling that doesn't cope well with
+         symlinking.
+         */
+        installMethod =
+          if isMainPackage name version
+          then "copy"
+          else "symlink";
 
         electronAppDir = ".";