Dynamic Class Loader in TypeScript - Node.js-il Open Mic- Dec 23 2024.pdf
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The document discusses the dynamic class loader in TypeScript, emphasizing the 'ports and adapters' concept that isolates application logic from infrastructure. It outlines the use of well-defined ports for communication and the need for multiple adapters depending on requirements, as well as dynamic configurations and the application of acceptance tests with Cucumber.js. Additionally, it touches on principles such as the open-closed principle in software design, indicating an ongoing development process.
Dynamic Class Loader in TypeScript - Node.js-il Open Mic- Dec 23 2024.pdf
- 1. Dynamic Class Loader in TypeScript
- 2. Asher Sterkin A Software Engineer since 1978
- 3. “Ports and Adapters” in a Nutshell Application Logic Isolated from Underlying Infrastructure Well-Defined Ports for in- and out- Communication Multiple Adapters upon the Need Configurator to Plug Adapters into Ports Multiple Adapters upon the Need
- 4. How Many is Many? Port Type Port Direct Call CLI HTTP/Json HTTP/HTML RAM DynamoDB System Local Remote Local Remote Local Remote Driving IForParkingCars IForIssuingFines IForAdministering Driven IForPaying IForObtainingDateTime IForStoringData Not all Combinations are Valid!
- 5. Preserving the Same Acceptance Test Suite cucumber.js BuyTicket.feature.md @ForParkingCars … configuration.json BuyTicket.steps.ts import { ForParkingCarsWorld } from './Worlds'; … Worlds.ts import { Configuration, Configurator } from '../outside'; import { ConfigWorld, setupWorld } from '@cucumber/config-world'; class BlueZoneWorldBase extends ConfigWorld<Configuration, Configurator>{ … export class BlueZoneWorld extends BlueZoneWorldBase { … export class ForParkingCarsWorld extends BlueZoneWorld { … setupWorld("@ForParkingCars", ForParkingCarsWorld); Configurator.ts export type Configuration = { readonly ForPaying?: string; readonly ForStoringData?: string; .. } export class Configurator implements IConfigurator { private classLoader: DynamicClassLoader; … }
- 6. Dynamic Configuration Module path per port
- 8. Dynamic Configuration Blame TS type erasure
- 10. Using Dynamic Module Loader Returns new(..) function for this ClassType
- 11. Dynamic Module Loader By convention
- 12. Module Path Resolver This is what happens when one trusts ChatGPT too much 😠
- 13. tsconfig-paths
- 15. Open-closed Principle "software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification" Bertrand Meyer
- 16. To be Continued …