How can I incorporate a JavaScript module into my Typescript code when importing from Typeings?

Exploring Angular2 and Typescript with the help of mgechev's angular2-seed for a new project has been an interesting experience. However, I have encountered a problem along the way.

My intention is to incorporate Numeral into a component, and here are the steps I have taken:

  1. Numeral was installed using npm install numeral
  2. The typing for Numeral was added using 
    typings install dt~numeraljs --global --save
  3. In my component, I imported Numeral with 
    import { numeral } from '/typings/globals/numeraljs';
  4. The code line 
    let num:Number = new Number(numeral().unformat(text));
    was included

Everything appeared to transpile successfully. However, upon reaching the browser, the console displayed the following error:

Error: XHR error (404 Not Found) loading http://localhost:5555/typings/globals/numeraljs.js(…)

What am I missing in this process? Is there a step I overlooked to specify to Typescript the location of the actual code?

javascripttypescriptangular

Answer №1

To properly import a package that is not a native Typescript module, you should use the following syntax:

import * as numeral from 'numeral';

The typings folder serves the purpose of informing Typescript about the type definitions, allowing for code highlighting and linting. The module you wish to import is located in the node_modules folder and can be imported using its name.

If you encounter errors regarding the inability to find the numeral module, you can include the following:

/// <reference path="typings/globals/numeraljs/numeraljs.d.ts"/>

Be sure to specify the correct path to the Typescript definition file.

Answer №2

Don't forget to include a reference link to the actual numeraljs.js file on your index.html page

For example, if your main page is index.html, make sure to add numeraljs.js to the head section

<head>
   <script src="myScriptLib/numeral/numeraljs.js"></script>
</head>

You can also utilize system.js to load all the necessary scripts

Answer №3

The correct method

import {default as numeral} from 'numeral';
numeral(1000000).format('$0,0.00') // $1,000,000

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