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Providers & Injection

Providers are classes decorated with @Injectable() that can be injected into commands, listeners, interceptors, or other providers via the constructor.

Defining a provider​

import { Injectable } from '@nodecord/core';

@Injectable()
export class DatabaseService {
    findUser(id: string) {
        // ...
    }
}

Injecting a provider​

Register the provider in a module, then inject it via the constructor:

@SlashCommand(...)
export class ProfileCommand {
  constructor(private readonly db: DatabaseService) {}

  execute(@Author() user: User) {
    return this.db.findUser(user.id);
  }
}

Provider scope​

By default all providers are singletons within their module's container. Providers declared in a global module are singletons shared across the entire application.