Can a TypeScript decorator be uniformly applied to all properties within a class?

Exploring the world of decorators in Typescript has led me to encounter a simple issue. Let's say I have a custom decorator named RetainType and a class structured like this:

class Person {
    @RetainType name: string;
    @RetainType age: number;
    @RetainType dateOfBirth: Date;
}

I wish to write it this way:

@RetainType class Person {
    name: string;
    age: number;
    dateOfBirth: Date;
}

In essence, is there a method to apply a decorator to all properties within a class? The purpose of using @RetainType is to generate metadata about each property (specifically design:type). Having a more streamlined approach instead of individually annotating every field would be advantageous.

Answer №1

When it comes to decorators, property decorator is specifically used for one property and does not return any value; its purpose is to perform certain actions related to that specific property.

On the other hand, class decorator is applied to the class constructor itself. It should return a function that modifies or enhances the functionality of the normal constructor.

With class decorators, you have more flexibility as you can manipulate the class in various ways, such as decorating all its properties according to your desired specifications. However, it's important to note that you cannot simply use property decorators as class decorators without modifying their behavior first.

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

Confirm the existence of a non-null value

One of the functions I have implemented is designed to remove null values from an array that is passed as input. This function also provides an optional transform functionality, allowing the user to modify the elements of the array into a custom format if ...

Is it possible to automatically open the Tinymce Comments sidebar without the need for a manual button click?

After successfully implementing the Tinymce comments plugin into our configuration, we have come across a request from our users. They would like the 'showcomments' button to automatically trigger on page load, displaying the sidebar containing t ...

In the realm of Typescript Angular, transferring the value of an object's property to another property within the

I'm working with a large TypeScript object and I am hoping to automate certain parts of it to streamline my workflow. myObject = [ { id: 0, price: 100, isBought: false, click: () => this.buyItem(100, 0) } buyItem (it ...

Zod data structure featuring optional fields

Is there a more efficient way to define a Zod schema with nullable properties without repeating the nullable() method for each property? Currently, I have defined it as shown below: const MyObjectSchema = z .object({ p1: z.string().nullable(), p2 ...

Encountering Flow type errors when declaring global variables in React

type Props = { checkedItems:any }; class MyApp extends Component<Props> { constructor(props) { super(props); this.checkedItems = []; } } In this code snippet, I am utilizing Flow for type checking within a React class component. However ...

OpenAPI implementation in NestJS that emphasizes the use of reusable parameters

Is it possible to reuse common parameters in the implementation of NestJS OpenAPI/Swagger? This feature would prevent me from having to clutter my endpoint with repetitive @ApiImplicitQuery decorators. ...

Creating a Node.js asynchronous setup function

I'm in the process of transitioning from Nodejs v12 to v14 and I've noticed that v14 no longer waits for the setup function to resolve. My setup involves Nodejs combined with Express. Here's a simplified version of my code: setup().then(cont ...

Filtering function that works without specific knowledge of keys

I'm working on a JavaScript method to filter a list dynamically without knowing the specific key (s). I've made some progress, but I'm stuck and not sure how to proceed. The foreach loop I have isn't correct, but I used it for clarity. ...

TypeORM ensures that sensitive information, such as passwords, is never returned from the database when retrieving a user

I developed a REST API using NestJs and TypeORM, focusing on my user entity: @Entity('User') export class User extends BaseEntity { @PrimaryGeneratedColumn() public id: number; @Column({ unique: true }) public username: string; publi ...

Probability of an event occurring when represented as whole numbers in percentage form

Currently, I'm developing a unique job system within a Discord bot that allows users to mine various types of ores. The probability of receiving specific ores is based on the user's mining skill level, which is stored in a database and can vary a ...

Internet Explorer is throwing unexpected routing errors in Angular 2

I have a spring-boot/angular 2 application that is working perfectly fine on Chrome, Safari, Opera, and Edge. However, when accessed through Internet Explorer, the app directly routes to the PageNotFound component. I have tried adding shims for IE in the i ...

Encountering a Typescript error with Next-Auth providers

I've been struggling to integrate Next-Auth with Typescript and an OAuth provider like Auth0. Despite following the documentation, I encountered a problem that persists even after watching numerous tutorials and mimicking their steps verbatim. Below i ...

typescript provides an asynchronous recursive mapping function that allows for changing parent data starting from the leaf node

I am currently facing a challenge in identifying the leaf node within a non-binary tree that requires modification. The process involves computing a blake2b hash from the leaf data, passing it to the parent node, and repeating this calculation until reachi ...

Angular does not recognize the boolean variable

Within my Angular component, I have declared two boolean variables: editingPercent: boolean = true; editingCap: boolean = false; In the corresponding HTML file, there is a checkbox that updates these variables based on user input: checkedChanged(e) { ...

Exporting an extended interface to allow for interoperability

I have a problem with exporting an interface called Person. I recently added a new property to it, but when I try to export it, I encounter the following error message: 'Person' only refers to a type, but is being used as a value here.. // test.d ...

Unlocking Not Exported Type Definitions in TypeScript

Take a look at this TypeScript code snippet: lib.ts interface Person { name: string; age: number; } export default class PersonFactory { getPerson(): Person { return { name: "Alice", age: 30, } } } ...

Directly within Angular, map the JSON data to an object for easy assignment

I came across this information on https://angular.io/guide/http. According to the source, in order to access properties defined in an interface, it is necessary to convert the plain object obtained from JSON into the required response type. To access pr ...

Tips on effectively rendering child components conditionally in React

My components currently consist of an AddBookPanel containing the AddBookForm. I am looking to implement a feature where the form is displayed upon clicking the 'AddBookButton', and hidden when the 'x' button (image within AddBookForm c ...

Unable to retrieve information from service using Angular 1.6 and TypeScript

I'm having an issue retrieving data from a Service in my Controller. Here is the code for my Service file: import {IHttpService} from 'Angular'; export class MyService { public static $inject = ['$http']; constructor(private $htt ...

What is the best way to search for and sort through the data in this particular scenario?

This code snippet is specifically created for extracting and comparing data from the Google spreadsheet shown in the images. exports.processosjudiciais = functions.https.onRequest(async (request, response): Promise<any> => { const jwtClient = ...