Devops stuff

shell.nix

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+{
+  pkgs ? import <nixpkgs> { },
+}:
+
+let
+  # First, select the rust toolchain attribute set from pkgs.
+  # This set contains cargo, rustc, rust-std, rust-src, etc.
+  # Using `pkgs.rust-toolchain` will select the default stable toolchain.
+  rust-toolchain = pkgs.rust-toolchain;
+in
+pkgs.mkShell {
+  # nativeBuildInputs are tools you run on your machine during development.
+  nativeBuildInputs = with pkgs; [
+    # 1. Add the main toolchain components (cargo, rustc).
+    rust-toolchain
+
+    # 2. Add the Rust standard library for our specific WebAssembly target.
+    #    We get `rust-std` from the `rust-toolchain` set we defined above
+    #    to guarantee version consistency.
+    (rust-toolchain.rust-std.override {
+      targets = [ "wasm32-unknown-unknown" ];
+    })
+
+    # 3. Add the other necessary tools.
+    wasm-bindgen-cli
+    bun
+    clang # Recommended linker for wasm on NixOS
+    pkg-config
+    openssl
+  ];
+
+  # Environment variables that will be set when you enter the shell.
+  shellHook = ''
+    # Set the linker for the wasm target to avoid potential issues.
+    export CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_LINKER="${pkgs.clang}/bin/clang"
+
+    # Set the path to the Rust standard library source code.
+    # This is used by tools like rust-analyzer for "go to definition", etc.
+    export RUST_SRC_PATH="${rust-toolchain}/lib/rustlib/src/rust/library"
+
+    echo "✅ Nix shell is ready with Rust (wasm target), wasm-bindgen, and Bun."
+  '';
+}