{ description = "Deterministic Rust WASM build"; inputs = { nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable"; crane.url = "github:ipetkov/crane"; rust-overlay = { url = "github:oxalica/rust-overlay"; inputs.nixpkgs.follows = "nixpkgs"; }; flake-utils.url = "github:numtide/flake-utils"; }; outputs = { self, nixpkgs, crane, rust-overlay, flake-utils, ... }: flake-utils.lib.eachDefaultSystem ( system: let pkgs = import nixpkgs { inherit system; overlays = [ (import rust-overlay) ]; }; rustToolchain = pkgs.rust-bin.stable."1.92.0".default.override { targets = [ "wasm32-unknown-unknown" ]; }; craneLib = (crane.mkLib pkgs).overrideToolchain rustToolchain; src = pkgs.lib.cleanSourceWith { src = ./.; filter = path: type: let baseName = builtins.baseNameOf path; parentDir = builtins.baseNameOf (builtins.dirOf path); in (parentDir == "proof" && pkgs.lib.hasSuffix ".zk.bin" baseName) || (craneLib.filterCargoSources path type); name = "source"; }; commonArgs = { inherit src; strictDeps = true; CARGO_BUILD_TARGET = "wasm32-unknown-unknown"; CARGO_INCREMENTAL = "0"; RUSTFLAGS = ""; cargoExtraArgs = "--lib"; doCheck = false; }; cargoArtifacts = craneLib.buildDepsOnly commonArgs; wasmLib = craneLib.buildPackage ( commonArgs // { inherit cargoArtifacts; installPhaseCommand = '' mkdir -p $out cp target/wasm32-unknown-unknown/release/*.wasm $out ''; } ); in { packages.default = wasmLib; devShells.default = craneLib.devShell { inputsFrom = [ wasmLib ]; packages = with pkgs; [ nixfmt-rfc-style ]; CARGO_BUILD_TARGET = "wasm32-unknown-unknown"; }; } ); }