Exploring the async/await functionality in TypeScript

Hey there!

I'm working with this Angular/TypeScript service, and I've run into an issue where the query part of the function is asynchronous. This means that the return statement gets executed before the data is actually retrieved from the server. Is there a way to modify this function to use async/await so it waits for the data to be assigned to the Users variable before returning?

    interface IUserService {
        getAll(): entities.IUser[];
    }

    export class UserService implements IUserService {
        static $inject: string[] = ['dataAccessService'];
        constructor(private dataAccessService: dataAccess.DataAccessService<entities.IUser>) {

        }

        getAll(): app.domain.entities.IUser[] {
            var users: app.domain.entities.IUser[];
            var userResource = this.dataAccessService.getDataResource('https://api.github.com/users');
            userResource.query((data: app.domain.entities.IUser[]) => {
                users = data;
            });

            return users;
        }
    }

    angular
        .module('domain')
        .service('userService',
                    UserService);

Answer №1

By using $resource, it is possible to directly assign resource values to a variable instead of doing so within the callback method.

interface IUserService {
    getAll(): ng.resource.IResourceArray<ng.resource.IResource<IUser>>;
}

export class UserService implements IUserService {
    static $inject: string[] = ['dataAccessService'];
    constructor(private dataAccessService: dataAccess.DataAccessService<entities.IUser>) {
        var userResource = this.dataAccessService.getDataResource('https://api.github.com/users');
    }

    getAll(): ng.resource.IResourceArray<ng.resource.IResource<IUser>> {
        return userResource.query();
    }
}

angular
    .module('domain')
    .service('userService',
                UserService);

In my controller, I can then directly assign the values to my variable for rendering in the view.

class UserController {
    user: ng.resource.IResourceArray<ng.resource.IResource<IUser>>;

    static $inject: string[] = ['UserService'];
    contructor(private userService: IUserService) {

    }

    this.users = this.userService.GetAll();
}

angular.module('app').controller('UserController', UserController);

This approach allows access to user properties and other properties like the original promise for adding additional functionality if needed.

I hope this explanation will assist anyone facing a similar challenge.

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