nix-conditionals

What problem does it solve?

Nix configuration often suffers from verbose conditionals and brittle merges. This skill provides idiomatic patterns using lib.mkIf, lib.mkMerge, lib.optionals, and lib.optionalString to write robust, composable conditional blocks and safe list handling.

Core Features & Use Cases

• mkIf - guard configuration blocks without breaking module merging
• mkMerge - combine conditional blocks into a single definition
• optionals - conditionally append list items safely
• optionalString - render strings only when needed Real-world use cases include toggling features in NixOS configurations based on system attributes or user options.

Quick Start

Use these patterns in a Nix configuration to guard features and compose conditional lists with minimal boilerplate.