Playground

This page runs the actual @nodelibraries/ioc source in your browser. Pick an example or write your own, then press Run. console.log output and uncaught errors appear on the right. Copy link puts the snippet in the URL so you can share it.

Example

TypeScript code

import { ServiceCollection, createToken } from '@nodelibraries/ioc';

interface Logger {
  log(message: string): void;
}
const Logger = createToken<Logger>('Logger');

class ConsoleLogger implements Logger {
  log(message: string) {
    console.log(`[log] ${message}`);
  }
}

class UserRepository {
  constructor(private logger: Logger) {}
  find(id: number) {
    this.logger.log(`find ${id}`);
    return { id, name: 'Ada' };
  }
}

const services = new ServiceCollection()
  .addSingleton(Logger, ConsoleLogger)
  .addScoped(UserRepository, [Logger]);

const provider = services.buildServiceProvider({ validateScopes: true, validateOnBuild: true });

const scope = provider.createScope();
const repo = await scope.getRequiredService(UserRepository);
console.log(repo.find(1));
console.log('same in scope:', repo === (await scope.getRequiredService(UserRepository)));

const other = provider.createScope();
console.log('same across scopes:', repo === (await other.getRequiredService(UserRepository)));

await scope.dispose();
await other.dispose();

Console

Press Run (or ⌘/Ctrl + Enter).

Types are stripped, not checked, here (Sucrase). The library itself is the real @nodelibraries/ioc source. await using needs a browser with explicit resource management (Chrome 134+); elsewhere call await scope.dispose().