noicejs

import { LocalModule } from './local';
import { NetworkModule } from './network';

class Cache {
  public get(path: string, ttl: number, fallback: () => Promise<string>): Promise<string> {
    /* ... */
  }
}

class Filesystem {
  public get(path: string): Promise<string> {
    /* ... */
  }
}

/**
 * Constructors, strings, and symbols are supported. Symbols are
 * preferred, as the most unique, but names can be convenient.
 */
@Inject(Cache.name.toLowerCase(), Filesystem.name.toLowerCase())
class Server {
  protected readonly cache: Cache;
  protected readonly filesystem: Filesystem;
  protected readonly ttl: number;

  constructor(options) {
    this.cache = options.cache;
    this.filesystem = options.filesystem;
    this.ttl = defaultTo(options.ttl, 0);
  }

  get(path: string) {
    return options.cache.get(path, this.ttl, () => options.filesystem.get(path));
  }
}

const TEST_TTL = 60;

function module() {
  if (process.env['DEBUG'] === 'TRUE') {
    return new LocalModule();
  } else {
    return new NetworkModule();
  }
}

async function main() {
  const container = Container.from(module());
  await container.configure();

  const server = await container.create(Server, {
    /* cache and filesystem are found and injected by container */
    ttl: TEST_TTL,
  });

  /* server.cache.get and server.filesystem.get will be called in order */
  const result = await server.get('some/file');
}