flake-file

What it does

Nix flakes require flake.nix to be written in a restricted subset of Nix: no imports, no lib.mkDefault, no computed values. flake-file removes this limitation:

Define inputs anywhere, in any Nix module, using full Nix language features
Typed schemas, Input and Output definitions based on Nix types
One-command regeneration, nix run .#write-flake produces a clean flake.nix
Consistency checks, flake check ensures generated files stay in sync
Multiple backends, supports flake.nix, unflake.nix, and npins/
Automatic lock flattening, via allfollow or nix-auto-follow

Example

# modules/inputs.nix, define inputs using real Nix
{ lib, ... }: {
  flake.inputs.nixpkgs.url = lib.mkDefault "github:NixOS/nixpkgs/nixos-${channel}";
  flake.inputs.home-manager = {
    url = "github:nix-community/home-manager";
    inputs.nixpkgs.follows = "nixpkgs";
  };
}

Then regenerate:

nix run .#write-flake

Who uses it

Used across the Aspect oriented ecosystem, den, checkmate, dendrix, and many flake-aspects users rely on flake-file for maintainable flake definitions.

Links

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