Accessing the NestJS DI container directly allows for seamless integration of dependency

I have been using NestJS for the past 4 months after working with PHP for 5 years, mainly with Symfony. With PHP, I had the ability to access the compiled DI container and retrieve any necessary service from it.

For example, in an application with services (A, B, C) where A depends on B and C, I could easily call the container in controllers or other services that were aware of it, and utilize the compiled A or C services as needed.

Is there a similar option in NestJS DI to call a specific service by some ID? I've tried looking for it, but all my searches lead to using compiled services only without direct access.

UPD: I am curious about accessing the DI container from a non-@Injectible class. For instance:

export class StatefulCruncherClass{

    constructor(private dataToCrunch:any){
          
    }

    async crunch(){
        if (this.dataToCrunch.isObject){
             return NestJs.getDI().get('ObjectsCruncher').crunch(this)
        } else {
             return NestJs.getDI().get('ArrayCruncher').crunch(this)
        }
    }
}

Answer №1

Utilizing moduleRef is the recommended approach for this scenario (documentation)

@Injectable()
export class CatsService implements OnModuleInit {
  private service: Service;
  constructor(private moduleRef: ModuleRef) {}

  onModuleInit() {
    this.service = this.moduleRef.get(Service);
  }
}

Attempting to access the container in a static context without injection raises concerns about design and architecture, potentially causing conflicts with the framework's functionality.

What is driving the need for non-injectable access?

Your other choice would involve exposing the Nest application instance for external importation, although I strongly discourage this practice.

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

TS1316 Error: You can only have global module exports at the top level of the file

Encountering difficulties while trying to compile an older typescript project that I am revisiting. The build process is failing due to an issue with q. I suspect it may be related to the tsc version, but no matter which version I try, errors persist. Som ...

Determining the generic type argument of a class can be unsuccessful due to the specific properties within that class

Why is it that Typescript sometimes fails to infer types in seemingly simple cases? I am trying to understand the behavior behind this. When Typescript's Type Inference Goes Wrong Consider the scenario where we have the following class declarations: ...

Serialising and deserialising TypeScript types in local storage

I'm currently working on a Typescript application where I store objects using local storage for development purposes. However, I've run into some trouble with deserialization. Specifically, I have an object called meeting of type MeetingModel: ...

The Power of Asynchronous Programming with Node.js and Typescript's Async

I need to obtain an authentication token from an API and then save that token for use in future API calls. This code snippet is used to fetch the token: const getToken = async (): Promise<string | void> => { const response = await fetch(&apos ...

Error Message: Module not found while using Node Express with TypeScriptIssue: A

I have set up a straightforward node express app using TypeScript. My goal is to implement an errorMiddleware in the index.ts file. As I try to start the server, I encounter the following error: at Module.require (node:internal/modules/cjs/loader:100 ...

Typescript: Determining the return type of a function based on its input parameters

I've been working on a function that takes another function as a parameter. My goal is to return a generic interface based on the return type of the function passed in as a parameter. function doSomething <T>(values: Whatever[], getter: (whatev ...

Trying out Angular2 service using a fabricated backend

Just a heads up: I know Angular2 is still in alpha and undergoing frequent changes. I am currently working with Angular2 and facing an issue with testing an injectable service that has a dependency on http. I want to test this service using a mock backend ...

Is there a way to transform time into a percentage with the help of the moment

I am looking to convert a specific time range into a percentage, but I'm unsure if moment.js is capable of handling this task. For example: let start = 08:00:00 // until let end = 09:00:00 In theory, this equates to 100%, however, my frontend data ...

How to simulate a typescript class using vitest

I am encountering a situation where I have a class A that imports another class B from a separate module and creates an instance of it. While writing tests for class A, I want to stub or mock some of the methods of class B. Below is an example code snippe ...

Angular HTML fails to update correctly after changes in input data occur

Within my angular application, there is an asset creator component designed for creating, displaying, and editing THREE.js 3D models. The goal was to implement a tree-view list to showcase the nested groups of meshes that constitute the selected model, alo ...

Contrasting bracket notation property access with Pick utility in TypeScript

I have a layout similar to this export type CameraProps = Omit<React.HTMLProps<HTMLVideoElement>, "ref"> & { audio?: boolean; audioConstraints?: MediaStreamConstraints["audio"]; mirrored?: boolean; screenshotFormat?: "i ...

Issue encountered when transitioning from Angular 8 to Angular 9: Value discrepancy at index 0

While updating my Angular project from version 8 to 9, I encountered an issue after following the update guide on update.angular.io and running npm update. When attempting to compile the website using ng serve, the following error occurred: ERROR in Faile ...

The disappearance of the "Event" Twitter Widget in the HTML inspector occurs when customized styles are applied

Currently, I am customizing the default Twitter widget that can be embedded on a website. While successfully injecting styles and making it work perfectly, I recently discovered that after injecting my styles, clicking on a Tweet no longer opens it in a ne ...

Using TypeScript to import a Vue 2 component into a Vue 3 application

Recently, I embarked on a new project with Vue CLI and Vite, utilizing Vue version 3.3.4 alongside TypeScript. In the process, I attempted to incorporate the vue-concise-slider into one of my components. You can find it here: https://github.com/warpcgd/vu ...

What impact does manually serializing gRPC request and response objects have on performance?

I am aiming to establish communication with a NodeJS microservice by sending and receiving data. The challenge lies in the fact that both my request and response objects have dynamic components - fields containing a union of 'string' and 'nu ...

How can you verify the anticipated log output in the midst of a function execution with Jest unit testing?

Below is a demonstration function I have: export async function myHandler( param1: string, param2: string, req: Request, next: NextFunction, ) { const log = req.log.prefix(`[my=prefix]`); let res; If (param1 === 'param1&a ...

Encountering issues when verifying the ID of Angular route parameters due to potential null or undefined strings

Imagine going to a component at the URL localhost:4200/myComponent/id. The ID, no matter what it is, will show up as a string in the component view. The following code snippet retrieves the ID parameter from the previous component ([routerLink]="['/m ...

What is the best way to revert a screen's state back to its original state while utilizing react navigation?

How can I reset the state in a functional component back to its initial state when navigating using navigation.navigate()? For example, if a user navigates to screen A, sets some state, then clicks a button and navigates to screen B, and then goes back to ...

Move the cache folder for NextJS to a new location

Is it possible to customize the location of the cache folder currently located in "./.next/cache"? I am interested in modifying this because I am developing an application that receives high traffic daily, and I plan to deploy multiple applications from m ...

Unable to utilize the forEach() function on an array-like object

While I generally know how to use forEach, I recently encountered a situation that left me puzzled. Even after searching online, I couldn't find any new information that could help. I recently started delving into TypeScript due to my work with Angul ...