What is the process of declaring a service in the global.d.ts file when using NodeJS Express?

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When using NodeJS Express, declaring a service in the global.d.ts file involves the following steps:

1. Create a new TypeScript file called global.d.ts in the root directory of your project.
2. Add the following code to the file:

declare namespace Express {
  export interface Request {
    service: any;
  }
}

This creates a new service property on the request object.

1. Import the global.d.ts file into your server.ts file (or index.ts, depending on your project structure) using the following code:

import './global';

1. In your middleware or route handlers, assign a value to the service property of the request object, like this:

app.get('/', (req: Request, res: Response) => {
  req.service = new SomeService(); // replace with your own service implementation
  // your code here
});

This makes the service available to all subsequent middleware and route handlers that use the same request object.

1. Use the service in your middleware or route handlers, like this:

app.get('/users', (req: Request, res: Response) => {
  const service = req.service;
  const users = service.getUsers(); // replace with your own service method
  res.json(users);
});

By assigning a value to the service property of the request object and using it in subsequent middleware and route handlers, you can access your service globally throughout your Express application.