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+---
+tags:
+  - nix
+---
+Root directory contains flake.nix:
+Specifies inputs (other flakes) and outputs ([[Nix derivations]]). Allows pinning versions of inputs (dependencies) making it easier to write reproducable expressions.
+
+Avoid multiple nixpkgs by including a follows on the input:
+```
+inputs = {
+  nixpkgs.url = "github:NixOS/nixpkgs/<branch name>";
+  hyprland = {
+    url = "github:hyprwm/Hyprland";
+    inputs.nixpkgs.follows = "nixpkgs";
+  };
+};
+```
+
+Outputs:
+[Flake check](https://github.com/NixOS/nix/blob/master/src/nix/flake-check.md)