templates: Make devshell work properly

packages/templates/default.nix

@@ -7,6 +7,7 @@
   imports = [
     dream2nix.modules.dream2nix.nodejs-package-json-v3
     dream2nix.modules.dream2nix.nodejs-granular-v3
+    dream2nix.modules.dream2nix.nodejs-devshell-v3
   ];
 
   deps = {nixpkgs, ...}: {
@@ -23,6 +24,8 @@
       yj < $out/package.yaml > $out/package.json
     '';
 
+    nativeBuildInputs = [config.deps.yj];
+
     # The default phase (which is hidden in `preInstallPhases`) will
     # copy the full node_modules directory to the output, and symlink
     # executables and whatnot.
@@ -35,10 +38,18 @@
     '';
   };
 
+  nodejs-package-lock-v3.packageLockFile = "${config.mkDerivation.src}/package-lock.json";
   nodejs-granular-v3.deps = {
     sharp."0.28.3".mkDerivation.buildInputs = with config.deps; [
       vips
       pkg-config
     ];
   };
+
+  nodejs-devshell-v3.nodeModules = {
+    nodejs-granular-v3.deps.sharp."0.28.3".mkDerivation.buildInputs = with config.deps; [
+      vips
+      pkg-config
+    ];
+  };
 }