"Could not start Language Server." on nix + direnv

[yangm97]

Could not start Language Server. Error: escript: exception error: undefined function erlang_ls:main/1 in function escript:run/2 (escript.erl, line 758) in call from escript:start/1 (escript.erl, line 277) in call from init:start_em/1 in call from init:do_boot/3

Reproducible with:

flake.nix

{
  description = "virtual environments";

  inputs.devshell.url = "github:numtide/devshell";
  inputs.flake-utils.url = "github:numtide/flake-utils";

  outputs = { self, flake-utils, devshell, nixpkgs }:
    flake-utils.lib.eachDefaultSystem (system: {
      devShell =
        let pkgs = import nixpkgs {
          inherit system;

          overlays = [ devshell.overlay ];
        };
        in
        pkgs.devshell.mkShell {
          packages = with pkgs; [
            erlangR21
            beam.packages.erlangR21.rebar3
            beam.packages.erlangR21.erlang-ls
          ];
        };
    });
}

.envrc

use flake

Maybe reverting #15 and setting the erlang_ls path to /usr/bin/env erlang_ls would workaround this issue?