Why is Typescript unable to recognize the name '$' even after importing jquery?

Currently, I am utilizing TypeScript version 1.4.1 for a project setup like this:

scripts/
    libs/
        jquery/
            jquery.d.ts // Latest from DefinitelyTyped
            jquery.js // 2.1.3
        lodash/
            lodash.d.ts // Latest from DefinitelyTyped
            lodash.js // 3.3.1
    main/
        test.ts

The content of my main/test.ts file is as follows:

/// <reference path="../libs/lodash/lodash.d.ts" />
/// <reference path="../libs/jquery/jquery.d.ts" />

import _ = require("lodash");
import $ = require("jquery");

function requireExistingElement($el: $.JQuery) {
    if(_.isUndefined($el) || _.isNull($el) || $el.length === 0) {
        throw new Error("It seems the requested element does not exist?");
    }
}

requireExistingElement($("body"));

Upon compiling with the command below:

tsc --module amd scripts/main/test.ts

Although I anticipate a successful run, the compilation gives me the following errors:

scripts/main/test.ts(7,38): error TS2304: Cannot find name '$'.
scripts/main/test.ts(13,24): error TS2304: Cannot find name '$'.

Hence, my query is: How do I reference jQuery correctly since the above method is not functioning? Or, could there be an error in my approach?

Answer №1

Replace ($el: $.JQuery) with ($el: JQuery)

In type annotations, the use of a variable like $ is not allowed. However, an interface such as JQuery can be used in a type annotation.

Answer №2

To set up the jQuery library, follow these steps:

npm install jquery

TypeScript will handle the automatic import of this library for you.

If you prefer using yarn over npm, the command should look like this:

yarn add jquery

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