added basic nix flake file.

flake.lock

@@ -0,0 +1,42 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1649676176,
+        "narHash": "sha256-OWKJratjt2RW151VUlJPRALb7OU2S5s+f0vLj4o1bHM=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "a4b154ebbdc88c8498a5c7b01589addc9e9cb678",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1650998007,
+        "narHash": "sha256-NcJnbGDBBN023x8s3ll3HZxBcQoPq1ry9E2sjg+4flc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a3917caedfead19f853aa5769de4c3ea4e4db584",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-21.11",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,32 @@
+{
+  description = "Trying nest.js";
+  
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-21.11";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }: 
+
+    flake-utils.lib.eachDefaultSystem (system:
+      let pkgs = nixpkgs.legacyPackages.${system}; in
+      rec {
+        packages = flake-utils.lib.flattenTree {
+          hello = pkgs.hello;
+          gitAndTools = pkgs.gitAndTools;
+          nodejs = pkgs.nodejs;
+        };
+        defaultPackage = packages.hello;
+        apps.hello = flake-utils.lib.mkApp { drv = packages.hello; };
+        defaultApp = apps.hello;
+        devShell = pkgs.mkShell {
+          name = "Nid-JS";
+          buildInputs = with pkgs; [
+            nodejs
+            flyway
+            nodePackages.node2nix
+            ];
+        };
+      }
+    );
+}

package-lock.json

@@ -4284,7 +4284,7 @@
     },
     "spritzjs": {
       "version": "git+https://gitlab.com/didiercrunch/spritzjs.git#a1ff5b27bb059571aa06f4adb41a2f895220c5e7",
-      "from": "spritzjs@git+https://gitlab.com/didiercrunch/spritzjs.git#a1ff5b27bb059571aa06f4adb41a2f895220c5e7"
+      "from": "git+https://gitlab.com/didiercrunch/spritzjs.git"
     },
     "sshpk": {
       "version": "1.16.1",