Is it possible to assign an interface to an object property in TypeScript?

Question

Is it possible to assign an interface to an object property in TypeScript?

I am currently working with an object that looks like this:

export class Section{
  singleLabel:string;
  pluralLabel:string;
  index:number;
  dataInterface:Interface;
}

My goal is to assign an interface to the dataInterface field, as I need to use the Section object in certain components/services to determine the type of Interface required for a specific method:

httpClient.get<section.dataInterface>(url);

Here is an example of an interface that could be assigned to the dataInterface field:

export interface Idata { 
  numeroPagina:number;
  numeroElementiPerPagina:number;
  numeroTotaleElementi:number;
}

I would like to achieve something along these lines:

section.dataInterface = Idata;
httpClient.get<section.dataInterface>(url);

Is there a way to store an Interface within an object field like this? Thank you.

angularjs typescript

Answer 1

Answer №1

Can you assign an interface as a value? The answer is no. Interfaces do not translate to javascript and are inaccessible during runtime:

An interface solely includes method and field declarations, lacking any implementation details. Thus, it cannot be utilized for constructing anything.

Once the Typescript code is transformed into JavaScript by the compiler, the interface disappears from the resulting JavaScript file. Its primary function lies in aiding development stages exclusively.

link

Answer 2

Can you assign an interface as a value? The answer is no. Interfaces do not translate to javascript and are inaccessible during runtime:

An interface solely includes method and field declarations, lacking any implementation details. Thus, it cannot be utilized for constructing anything.

Once the Typescript code is transformed into JavaScript by the compiler, the interface disappears from the resulting JavaScript file. Its primary function lies in aiding development stages exclusively.

link

Answer 3

Answer №2

It appears that you are looking to utilize a nested interface within an interface in your code. Below is the example of how you can achieve this by accessing nested interfaces using bracket notation.


// defining interface types
interface IData {
    pageNumber: number;
    elementsPerPage: number;
    totalElements: number;
}

interface ISection {
    singularLabel: string;
    pluralLabel: string;
    sectionIndex: number;
    dataInterface: IData;
}

// implementing nested interface

httpClient.get<ISection["dataInterface"]>(url);

export class Section implements ISection {}

Answer 4

It appears that you are looking to utilize a nested interface within an interface in your code. Below is the example of how you can achieve this by accessing nested interfaces using bracket notation.


// defining interface types
interface IData {
    pageNumber: number;
    elementsPerPage: number;
    totalElements: number;
}

interface ISection {
    singularLabel: string;
    pluralLabel: string;
    sectionIndex: number;
    dataInterface: IData;
}

// implementing nested interface

httpClient.get<ISection["dataInterface"]>(url);

export class Section implements ISection {}

Is it possible to assign an interface to an object property in TypeScript?

Answer №1

Answer №2

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