How to bring in an interface in Angular 2

For my Meteor app using Angular 2, I am looking to create a custom data type like the one below:

interface MyCustomType {
  index: number;
  value: string;
}

To use this custom type across multiple files, I attempted to create a separate file named "mycustom.type.ts" with the following content:

export interface MyCustomType {
  index: number;
  value: string;
}

When trying to import this type for use in another file, I ran into an error in Atom:

TS Error File '/.../mycustom.type.ts' is not a module ...

What is the correct way to declare and import types so that they are accessible in various parts of the project?

angulartypescriptinterface

Answer №1

It is recommended to import it in this manner: 

import { MyCustomType } from './mycustom.type';

Remember to include both the { and }.

Answer №2

Here is a more detailed answer to address the incomplete information in the accepted one. There are two key issues that need to be resolved:

Firstly, don't forget to include the export keyword in your interface declaration to ensure it can be imported as a module:

export interface MyCustomType {
  index: number;
  value: string;
}

Secondly, make sure to enclose the import statement within curly brackets { }:

import { MyCustomType } from './mycustom.type';

Answer №3

It seems that the issue lies within the current path of the component. Consider replacing "./" with "../" to resolve the problem.

Answer №4

I attempted all of the top solutions, but I am still encountering the same error. Upon further investigation, I discovered that @edzillion pointed out a crucial issue that could be causing this error.

Firstly, you must include 'export' in your interface in order to import it as a module.

Secondly, make sure to include curly brackets { } in your import statement.

Thirdly, ensure that the name of your interface matches the name of the file it exists in.

Answer №5

It appears that the issue lies within the file path:

Here is an example that might clarify:

If your file is located in a different directory, please take a look at the following:

import { IPosts } from "../interfaces/iposts.type";

iposts.type.ts : 

export interface IPosts {
   userId: number;
   id: number;
   title: string;
   body: string;
}

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