Elixir Configuration

Guide for proper application configuration in Elixir, with emphasis on understanding and correctly using runtime vs compile-time configuration.

When to Activate

Use this skill when:

• Setting up or modifying application configuration
• Choosing between config.exs and runtime.exs
• Deciding between Application.compile_env and Application.get_env
• Debugging configuration-related issues
• Working with releases or deployment configuration
• Migrating from use Mix.Config to import Config
• Writing libraries that need configuration

Critical Principle

Runtime configuration is the preferred approach. Only use compile-time configuration when values must affect compilation itself.