Have an easy way to use abstract services

[LoicPoullain]

Issue

In some situations, we'd like to define an abstract service and choose which concrete service to use in the configuration depending on the environment.

Solution

logger:
  driver: 'my-package'

# OR

logger:
  driver: ./services/advanced-logger

logger.service.ts

export abstract class Logger {
  static concreteClassConfigPath = 'logger.driver';
  static concreteClassName = 'ConcreteLogger';

  abstract log(str: string): string;
}

advanced-logger.service.ts

export class AdvancedLogger extends Logger {
  log(str: string): string {
    console.log(str);
  }
}

export { AdvancedLogger as ConcreteLogger };

a random service

export class Service {
  @dependency
  logger: Logger;

  // ...
}

[LoicPoullain]

Feature added in v1.10.0