Async Providers

Problem

Create a service only after its asynchronous dependency is available.

Solution

const Config = token<{ apiUrl: string }>('Config');
const Client = token<{ url: string }>('Client');

container.factory(Config, [], async () => ({ apiUrl: await loadApiUrl() }));
container.factory(Client, [Config], (config) => ({ url: config.apiUrl }));

const client = await container.resolve(Client);

Pitfalls

Concurrent singleton resolutions share one in-flight result.

Related

• Usage Guide