Every project depends on existing software that is beyond your
control. Nix DSL enables you to declaratively specify your projects
dependencies, a repo or a tar-ball down to the file digest of its
content, which is what gives nix superpowers of being a deterministic
and reproducible package manager. This means that if your inputs stays
the same, nix guarantees that it produces the exact same output
regardless of when and where. Below is a flake that pulls in latest
version of Clojure into your project.

{
  # optional attribute
  description = "My awesome Clojure/ClojureScript project";

  # required attribute
  inputs = {
    # nix dsl fns useful for writing flakes
    flake-utils.url = "github:numtide/flake-utils/v1.0.0";
    # Pins state of the packages to a specific commit sha
    pinnedPkgs.url = "github:NixOS/nixpkgs/c46290747b2aaf090f48a478270feb858837bf11";
  };

  # required attribute
  outputs = { self, flake-utils, pinnedPkgs }@inputs :
  flake-utils.lib.eac