factory-provider.ts

import DependencyContainer from "../types/dependency-container.ts";
import Provider from "./provider.ts";

/**
 * Provide a dependency using a factory.
 * Unlike the other providers, this does not support instance caching. If
 * you need instance caching, your factory method must implement it.
 */
export default interface FactoryProvider<T> {
  useFactory: (dependencyContainer: DependencyContainer) => T;
}

export function isFactoryProvider<T>(
  provider: Provider<T>,
): provider is FactoryProvider<any> {
  return !!(provider as FactoryProvider<T>).useFactory;
}