add: create devShell

src/subsystems/nodejs/builders/strict-builder/default.nix

@@ -196,6 +196,10 @@
             then "copy"
             else "symlink";
 
+          passthru.devShell = import ./devShell.nix {
+            inherit nodejs pkg pkgs;
+          };
+
           unpackCmd =
             if lib.hasSuffix ".tgz" src
             then "tar --delay-directory-restore -xf $src"
@@ -314,7 +318,15 @@
           "${name}"."${version}" = allPackages."${name}"."${version}";
         })
         packages);
+    devShells =
+      {default = devShells.${defaultPackageName};}
+      // (
+        l.mapAttrs
+        (name: version: allPackages.${name}.${version}.devShell)
+        packages
+      );
   in {
     packages = mainPackages;
+    inherit devShells;
   };
 }

src/subsystems/nodejs/builders/strict-builder/devShell.nix

@@ -0,0 +1,27 @@
+{
+  nodejs,
+  pkg,
+  pkgs,
+}:
+with pkgs;
+  mkShell {
+    buildInputs = [
+      nodejs
+    ];
+    shellHook = let
+      nodeModulesDir = pkg.deps;
+    in ''
+      # rsync the node_modules folder
+      # is way faster than copying everything again, because it only replaces updated files
+
+      # current Options:
+      # -a -> all files recursive, preserve symlinks, etc.
+      # -c -> calculate hashsums
+      # -E -> preserve executables
+      # --delete -> removes deleted files
+      ${rsync}/bin/rsync -acE --delete ${nodeModulesDir}/* ./node_modules/
+
+      chmod -R +w ./node_modules
+      export PATH="$PATH:$(realpath ./node_modules)/.bin"
+    '';
+  }