MurylloEx/typescript-dependency-injection-pattern

This is a repository to show how the Dependency Injection (DI) works in Typescript. This concept is used by various frameworks, like Angular / NestJS.

TypeScript Dependency Injection Pattern

This project was created due to necessity in a library that uses Dependency Injection.

This repository contains a project with dependency injection pattern.

Para utilizá-lo você necessitará da versão mais recente do Node.js e do npm.

Instalação

git clone https://github.com/MurylloEx/typescript-dependency-injection-pattern.git
npm install

Declaring services

@Service()
class DatabaseService {

  constructor() {}

  insert(table: string, data: { [column: string]: string | number }) {
    console.log(`writing to ${table}:`);
    console.log(data);
  }
}

@Service()
class LoggerService {

  constructor(private dbService: DatabaseService) {}

  info(message: string) {
    this.dbService.insert('log', {
      level: 200,
      message: message
    });
  }
}

@Service()
class UserService {

  constructor(private logger: LoggerService) {}

  editUser(userId: number) {
    this.logger.info(`User ${userId} has been edited`);
  }
}

Loading and using services

const container = ServiceContainer.create().providers([
  LoggerService,
  UserService,
  DatabaseService
]);

Injector.create(container).resolveAll();

const userService: UserService = container.get<UserService>(UserService);

userService.editUser(3);

Metadados

Muryllo Pimenta – muryllo.pimenta@upe.br

Distribuído sobre a licença MIT. Veja LICENSE para mais informações.

Contribuição

1. Fork it (https://github.com/MurylloEx/typescript-dependency-injection-pattern/fork)
2. Create your feature branch (git checkout -b feature/fooBar)
3. Commit your changes (git commit -am 'Add some fooBar')
4. Push to the branch (git push origin feature/fooBar)
5. Create a new Pull Request