{
  description = "English reading lessons with a Leptos site";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { nixpkgs, rust-overlay, ... }:
    let
      systems = [
        "x86_64-linux"
        "aarch64-linux"
        "x86_64-darwin"
        "aarch64-darwin"
      ];

      forEachSystem = f: nixpkgs.lib.genAttrs systems f;
    in
    {
      devShells = forEachSystem (system:
        let
          pkgs = import nixpkgs {
            inherit system;
            overlays = [ (import rust-overlay) ];
          };

          rustToolchain = pkgs.rust-bin.stable.latest.default.override {
            targets = [ "wasm32-unknown-unknown" ];
          };
        in
        {
          default = pkgs.mkShell {
            packages = [
              rustToolchain
              pkgs.trunk
              pkgs.wasm-bindgen-cli
              pkgs.binaryen
              pkgs.pkg-config
              pkgs.git
            ];

            RUST_SRC_PATH = "${rustToolchain}/lib/rustlib/src/rust/library";

            shellHook = ''
              echo "Leptos shell ready. Run: trunk serve --open"
            '';
          };
        });
    };
}