Add initial dev shells

.envrc

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+use flake

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1750365781,
+        "narHash": "sha256-XE/lFNhz5lsriMm/yjXkvSZz5DfvKJLUjsS6pP8EC50=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "08f22084e6085d19bcfb4be30d1ca76ecb96fe54",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+  outputs =
+    { nixpkgs, ... }:
+    let
+      system = "x86_64-linux";
+      pkgs = import nixpkgs { inherit system; };
+
+      inherit (pkgs) callPackage;
+
+      commonPhpPackages = with pkgs; [
+        phpactor
+      ];
+    in
+    {
+      devShells.${system} = {
+        default = pkgs.mkShell {
+          packages = with pkgs; [ nixd ];
+        };
+
+        nodejs = callPackage ./modules/nodejs.nix { };
+
+        php82 = callPackage ./modules/php82.nix { inherit commonPhpPackages; };
+
+        php83 = callPackage ./modules/php83.nix { inherit commonPhpPackages; };
+      };
+
+      formatter.${system} = pkgs.nixfmt-rfc-style;
+    };
+}

modules/nodejs.nix

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+{ pkgs }:
+
+pkgs.mkShell {
+  packages = with pkgs; [
+    nodejs
+    nodePackages.pnpm
+    nodePackages.yarn
+  ];
+}

modules/php82.nix

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+{ commonPhpPackages, pkgs, ... }:
+
+pkgs.mkShell {
+  packages =
+    with pkgs;
+    [
+      php82
+      php82Packages.composer
+    ]
+    ++ commonPhpPackages;
+}

modules/php83.nix

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+{ commonPhpPackages, pkgs }:
+
+pkgs.mkShell {
+  packages =
+    with pkgs;
+    [
+      php83
+      php83Packages.composer
+    ]
+    ++ commonPhpPackages;
+}