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backend/node_modules/lodash/flake.nix

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+{
+  inputs = {
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, utils }:
+    utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages."${system}";
+      in rec {
+       devShell = pkgs.mkShell {
+          nativeBuildInputs = with pkgs; [
+            yarn
+            nodejs-14_x
+            nodePackages.typescript-language-server
+            nodePackages.eslint
+          ];
+        };
+      });
+}