incl.md

Include Filter

It is very common that you want to filter your source code in order to avoid unnecessary rebuilds and increase your cache hits.

This is so common that std includes a tool for this:

{
  inputs,
  cell,
}: let
  inherit (inputs) nixpkgs;
  inherit (inputs) std;
in {
  backend = nixpkgs.mkYarnPackage {
    name = "backend";
    src = std.incl (inputs.self + /src/backend) [
      (inputs.self + /src/backend/app.js)
      (inputs.self + /src/backend/config/config.js)
      /* ... */
    ];
  };
}