Function main

examples/context/src/dependency-injection.ts:90–133

()

}

export async function main() {
  const ctx = new Context('request');

  // Bind greeting service
  ctx.bind(GREETING_SERVICE).toClass(GreetingService);

  // Set the current date to a factory function
  ctx.bind(CURRENT_DATE).toDynamicValue(getCurrentDate);

  // Set the current user to `John` (a constant value)
  ctx.bind('currentUser').to('John');

  // Set the current language to `zh`
  ctx.bind('currentLanguage').to('zh');

  // Add EnglishGreeter for now
  ctx.bind('greeters.EnglishGreeter').toClass(EnglishGreeter).tag('greeter');

  // Get an instance of the greeting service
  const greetingService = await ctx.get(GREETING_SERVICE);

  // Invoke `greet` as a method
  let greeting = await greetingService.greet('en', 'Jane');
  console.log(greeting);

  // Use `invokeMethod` to apply method injection
  greeting = await invokeMethod(greetingService, 'greet', ctx);
  console.log(greeting);

  // Now add ChineseGreeter
  ctx.bind('greeters.ChineseGreeter').toClass(ChineseGreeter).tag('greeter');

  greeting = await invokeMethod(greetingService, 'greet', ctx);
  console.log(greeting);

  // Change the current language to `en`
  ctx.bind('currentLanguage').to('en');

  // Change the current user to `Jane`
  ctx.bind('currentUser').to('Jane');

  greeting = await invokeMethod(greetingService, 'greet', ctx);
  console.log(greeting);
}

if (require.main === module) {
  main().catch(err => {