{ lib
, buildPythonPackage
, fetchFromGitHub
, poetry-core
, pytest-asyncio
, pytestCheckHook
, pythonOlder
, typing-extensions
}:

buildPythonPackage rec {
  pname = "reactivex";
  version = "4.0.4";
  format = "pyproject";

  disabled = pythonOlder "3.7";

  src = fetchFromGitHub {
    owner = "ReactiveX";
    repo = "RxPY";
    rev = "refs/tags/v${version}";
    hash = "sha256-W1qYNbYV6Roz1GJtP/vpoPD6KigWaaQOWe1R5DZHlUw=";
  };

  nativeBuildInputs = [
    poetry-core
  ];

  propagatedBuildInputs = [
    typing-extensions
  ];

  checkInputs = [
    pytest-asyncio
    pytestCheckHook
  ];

  postPatch = ''
    # Upstream doesn't set a version for their GitHub releases
    substituteInPlace pyproject.toml \
      --replace 'version = "0.0.0"' 'version = "${version}"'
  '';

  pythonImportsCheck = [
    "reactivex"
  ];

  meta = with lib; {
    description = "Library for composing asynchronous and event-based programs";
    homepage = "https://github.com/ReactiveX/RxPY";
    license = with licenses; [ mit ];
    maintainers = with maintainers; [ fab ];
  };
}