see 0.1.1

A high-performance, asynchronous runtime-agnostic alternative to tokio::sync::watch
Documentation 
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{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    rust-overlay.url = "github:oxalica/rust-overlay";
    flake-utils.url = "github:numtide/flake-utils";
    rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = {
    nixpkgs,
    rust-overlay,
    flake-utils,
    ...
  }:
    flake-utils.lib.eachDefaultSystem (
      system: let
        overlays = [(import rust-overlay)];
        pkgs = import nixpkgs {
          inherit system overlays;
        };
      in
        with pkgs; {
          devShells.default = mkShell {
            buildInputs = [
              pkg-config
              (rust-bin.selectLatestNightlyWith (toolchain:
                toolchain.default.override {
                  extensions = ["rust-src"];
                }))
            ];
          };
        }
    );
}