Unable to use global modules in NestJS without importing them

Question

Unable to use global modules in NestJS without importing them

Currently, I am in the process of integrating a global module into my nest.js project

I have written a service as shown below:

export interface ConfigData {
    DB_NAME:        string;
}

@Injectable()
export class ConfigManager {
    private static _instance?: ConfigManager;
    public static configData:ConfigData | null;
    private constructor() {
        console.log(ConfigManager)
        if (ConfigManager._instance)
            ConfigManager._instance = this;
        else{
            ConfigManager._instance = new ConfigManager()
            ConfigManager.configData = <ConfigData|null><unknown>ConfigManager.fetchSecretData()
        }
    }
    private static async fetchSecretData():Promise<ConfigData|null>{
        // some data from db
    }
    // static get instance() {
    //     return ConfigManager._instance ?? (ConfigManager._instance = new ConfigManager());
    //     //return ConfigManager._instance ?? (ConfigManager._instance = ConfigManager.fetchSecretData()) //new ConfigManager());
    // }
    
}

configuration.module.ts

@Global()
@Module({
    providers: [ConfigManager],
    exports: [ConfigManager],
})
export class ConfigurationModule {}

Within app.module.ts, I included ConfigurationModule in the imports section.

However, upon adding a private constructor to the service, it prevented me from including it in the module.ts file.

My expectation was that I would be able to access configData from anywhere without having to import ConfigManager. Unfortunately, this is not functioning as intended...

The issue lies in the fact that ConfigManager is inaccessible without importing it first.

javascript typescript nestjs

Answer 1

Answer №1

If you've only used the @Global decorator on your module in NestJS, it's important to also include that module in your core application module for it to be globally accessible.

To achieve this, simply add your module to your core application module like so (or whatever your root module is named):

@Module({
  imports: [ConfigurationModule],
})
export class AppModule {}

You can refer to the documentation for more information.

The @Global() decorator defines the module as global-scoped. Global modules should typically be registered once, usually within the root or core module of the application.

Answer 2

If you've only used the @Global decorator on your module in NestJS, it's important to also include that module in your core application module for it to be globally accessible.

To achieve this, simply add your module to your core application module like so (or whatever your root module is named):

@Module({
  imports: [ConfigurationModule],
})
export class AppModule {}

You can refer to the documentation for more information.

The @Global() decorator defines the module as global-scoped. Global modules should typically be registered once, usually within the root or core module of the application.

Answer 3

Answer №2

By utilizing global modules within Nest, you eliminate the need to repeatedly include that module in the imports: [] section of every other module that requires its providers. The providers within the global module function just like normal providers, meaning you still have to inject them where they are needed.

In your specific scenario, since you have marked ConfigManager with @Global() and imported ConfigurationModule in app.module.ts, there is no requirement to add ConfigurationModule in the imports for any other modules that wish to utilize ConfigManager. However, you will still need to inject the ConfigManager provider - this is indicated by using @Injectable().

To perform the injection, you must have a

constructor(private configManager: ConfigManager) {}

within the class that requires access to ConfigManager. Additionally, since you need to know the type of the class, you will also need to

import { ConfigManager } from '../path/to/ConfigManager'

.

Answer 4

By utilizing global modules within Nest, you eliminate the need to repeatedly include that module in the imports: [] section of every other module that requires its providers. The providers within the global module function just like normal providers, meaning you still have to inject them where they are needed.

In your specific scenario, since you have marked ConfigManager with @Global() and imported ConfigurationModule in app.module.ts, there is no requirement to add ConfigurationModule in the imports for any other modules that wish to utilize ConfigManager. However, you will still need to inject the ConfigManager provider - this is indicated by using @Injectable().

To perform the injection, you must have a

constructor(private configManager: ConfigManager) {}

within the class that requires access to ConfigManager. Additionally, since you need to know the type of the class, you will also need to

import { ConfigManager } from '../path/to/ConfigManager'

.

Answer 5

Answer №3

In the realm of ES6/TS, it is essential to import a class before using it in your code.

It seems like you may be confusing dependency injection (instantiation/composition) with importing classes into the module's scope.

Answer 6

In the realm of ES6/TS, it is essential to import a class before using it in your code.

It seems like you may be confusing dependency injection (instantiation/composition) with importing classes into the module's scope.

Unable to use global modules in NestJS without importing them

Answer №1

Answer №2

Answer №3

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