nix.registry.<name>.to

The flake reference from is rewritten to.

The format of flake references is described in nix3-flake(1).

Type
attribute set of (string or signed integer or boolean or absolute path or package)
Example
{
  owner = "my-org";
  repo = "my-nixpkgs";
  type = "github";
}
Declared
<nixpkgs/nixos/modules/config/nix-flakes.nix>