{ description = "Build a cargo project"; inputs = { nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable"; # The version of wasm-bindgen-cli needs to match the version in Cargo.lock # Update this to include the version you need nixpkgs-for-wasm-bindgen.url = "github:NixOS/nixpkgs/4e6868b1aa3766ab1de169922bb3826143941973"; crane.url = "github:ipetkov/crane"; flake-utils.url = "github:numtide/flake-utils"; rust-overlay = { url = "github:oxalica/rust-overlay"; inputs.nixpkgs.follows = "nixpkgs"; }; }; outputs = { self, nixpkgs, crane, flake-utils, rust-overlay, nixpkgs-for-wasm-bindgen, ... }: flake-utils.lib.eachDefaultSystem (system: let pkgs = import nixpkgs { inherit system; overlays = [ (import rust-overlay) ]; }; inherit (pkgs) lib; rustToolchainFor = p: p.rust-bin.stable.latest.default.override { # Set the build targets supported by the toolchain, # wasm32-unknown-unknown is required for trunk targets = [ "wasm32-unknown-unknown" ]; }; craneLib = ((crane.mkLib pkgs).overrideToolchain rustToolchainFor).overrideScope (_final: _prev: { # The version of wasm-bindgen-cli needs to match the version in Cargo.lock. You # can unpin this if your nixpkgs commit contains the appropriate wasm-bindgen-cli version inherit (import nixpkgs-for-wasm-bindgen { inherit system; }) wasm-bindgen-cli; }); # When filtering sources, we want to allow assets other than .rs files src = lib.cleanSourceWith { src = ./.; # The original, unfiltered source filter = path: type: (lib.hasSuffix "\.html" path) || (lib.hasSuffix "\.scss" path) || # Example of a folder for images, icons, etc (lib.hasInfix "/assets/" path) || # Default filter from crane (allow .rs files) (craneLib.filterCargoSources path type) ; }; # Common arguments can be set here to avoid repeating them later commonArgs = { inherit src; strictDeps = true; # We must force the target, otherwise cargo will attempt to use your native target CARGO_BUILD_TARGET = "wasm32-unknown-unknown"; buildInputs = [ # Add additional build inputs here ] ++ lib.optionals pkgs.stdenv.isDarwin [ # Additional darwin specific inputs can be set here pkgs.libiconv ]; }; # Build *just* the cargo dependencies, so we can reuse # all of that work (e.g. via cachix) when running in CI cargoArtifacts = craneLib.buildDepsOnly (commonArgs // { # You cannot run cargo test on a wasm build doCheck = false; }); # Build the actual crate itself, reusing the dependency # artifacts from above. # This derivation is a directory you can put on a webserver. my-app = craneLib.buildTrunkPackage (commonArgs // { inherit cargoArtifacts; # The version of wasm-bindgen-cli here must match the one from Cargo.lock. wasm-bindgen-cli = pkgs.wasm-bindgen-cli.override { version = "0.2.93"; hash = "sha256-DDdu5mM3gneraM85pAepBXWn3TMofarVR4NbjMdz3r0="; cargoHash = "sha256-birrg+XABBHHKJxfTKAMSlmTVYLmnmqMDfRnmG6g/YQ="; }; }); # Quick example on how to serve the app, # This is just an example, not useful for production environments serve-app = pkgs.writeShellScriptBin "serve-app" '' ${pkgs.python3Minimal}/bin/python3 -m http.server --directory ${my-app} 8000 ''; in { checks = { # Build the crate as part of `nix flake check` for convenience inherit my-app; # Run clippy (and deny all warnings) on the crate source, # again, reusing the dependency artifacts from above. # # Note that this is done as a separate derivation so that # we can block the CI if there are issues here, but not # prevent downstream consumers from building our crate by itself. my-app-clippy = craneLib.cargoClippy (commonArgs // { inherit cargoArtifacts; cargoClippyExtraArgs = "--all-targets -- --deny warnings"; }); # Check formatting my-app-fmt = craneLib.cargoFmt { inherit src; }; }; packages.default = my-app; apps.default = flake-utils.lib.mkApp { drv = serve-app; }; devShells.default = craneLib.devShell { # Inherit inputs from checks. checks = self.checks.${system}; # Additional dev-shell environment variables can be set directly # MY_CUSTOM_DEVELOPMENT_VAR = "something else"; # Extra inputs can be added here; cargo and rustc are provided by default. packages = [ pkgs.trunk ]; }; }); }