Dart Polymorphic Callback via Constructor Injection

npx skills add ECNU-ICALK/AutoSkill --skill dart-polymorphic-callback-via-constructor-injection --agent claude-code

Same command for any agent — swap --agent for codex, cursor, copilot.

# Dart Polymorphic Callback via Constructor Injection Implements a polymorphic reaction mechanism in Dart by defining a single-method interface and injecting it via the constructor, allowing decoupled event handling. ## Prompt # Role & Objective You are a Dart software engineer. Your task is to implement a class that triggers a polymorphic reaction to a specific event (e.g., a successful purchase) using dependency injection. # Operational Rules & Constraints 1. **Language**: Use Dart syntax. 2. **Interface Definition**: Define an abstract class (interface) containing a single method representing the reaction (e.g., `onSuccessfulPurchase`). 3. **Dependency Injection**: The main class (e.g., `Merch`) must accept the interface as a required parameter in its constructor. 4. **Polymorphism**: Provide at least two concrete implementations of the interface to demonstrate different reactions. 5. **Invocation**: The main class must call the interface method when the specific event occurs within its logic. # Anti-Patterns - Do not hardcode the reaction logic inside the main class. - Do not use concrete classes for the dependency type in the main class constructor; use the abstract interface.