Rust project builds from the command line, but not in VS Code

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Hey folks, seems like every time I think I’m starting to figure things out, I hit a new wrinkle. :slight_smile:

I’ve been trying to move various projects to devshells. Using the code-fhs package and direnv, I’m generally able to create devshells, cd in, have them automatically set up, run code ., and things just work. I have a Rust project that’s giving me grief, though.

In short, it builds with cargo build from the command line, and some VS Code functionality works (E.g. goto definition for some crates.) But RA fails to compile my app. I can sometimes navigate to definitions in crates that RA may have compiled, but I generally can’t see problems in my own code.

RA’s output displays the following error:

cargo:warning=
  pkg-config exited with status code 1
  > PKG_CONFIG_PATH=/usr/lib/pkgconfig PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1 pkg-config --libs --cflags javascriptcoregtk-4.1 'javascriptcoregtk-4.1 >= 2.38'

  The system library `javascriptcoregtk-4.1` required by crate `javascriptcore-rs-sys` was not found.
  The file `javascriptcoregtk-4.1.pc` needs to be installed and the PKG_CONFIG_PATH environment variable must contain its parent directory.
  PKG_CONFIG_PATH contains the following:
      - /usr/lib/pkgconfig

  HINT: you may need to install a package such as javascriptcoregtk-4.1, javascriptcoregtk-4.1-dev or javascriptcoregtk-4.1-devel.

It’s definitely in my flake.nix:

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
    utils.url = "github:numtide/flake-utils";
    naersk.url = "github:nix-community/naersk/master";
  };

  outputs =
    {
      self,
      nixpkgs,
      utils,
      naersk,
    }:
    utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = import nixpkgs { inherit system; };
        naersk-lib = pkgs.callPackage naersk { };
        libs = with pkgs; [
          webkitgtk_4_1 # right here
          gtk3
          xdotool.out
        ];
      in
      {
        defaultPackage = naersk-lib.buildPackage ./.;
        devShell =
          with pkgs;
          mkShell {
            nativeBuildInputs = [
              clang
              cargo
              rustc
              rustfmt
              rustPackages.clippy
              cargo-binstall
              mold
              pkg-config
              pre-commit
              lldb
            ];
            buildInputs = [
              webkitgtk_4_1 # and here again
              gtk3
              xdotool.out
            ];
            shellHook = ''
              pre-commit install
              export RUSTFLAGS="-C link-arg=-Wl,-rpath,${lib.makeLibraryPath libs}";
            '';
            RUST_SRC_PATH = rustPlatform.rustLibSrc;
          };
      }
    );
}

I’ve had a lot of weirdness setting this up. In particular, at one point it complained about missing libsoup, so I added libsoup_3 to libs and buildInputs and that got me here. So thinking I was on the wrong path, I removed it, cd’d back out and in to set things up, relaunched code, and now I’m here.

How do I get RA to see all of these dependencies when run under code? Is there something else I can do to make this flake better/less repetitive?