depot/third_party/home-manager/modules/lib/assertions.nix

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{ lib }:
{
assertPlatform = module: pkgs: platforms: {
assertion = lib.elem pkgs.stdenv.hostPlatform.system platforms;
message = let
platformsStr = lib.concatStringsSep "\n"
(map (p: " - ${p}") (lib.sort (a: b: a < b) platforms));
in ''
The module ${module} does not support your platform. It only supports
${platformsStr}'';
};
}