How can I stop "property does not exist on type JQuery" syntax errors when using Typescript?

Question

I am only using one line of jQuery in my application:

$("div.printArea").printArea();

But this is giving me a Typescript error:

The property 'printArea' does not exist on type JQuery?

Can someone tell me how I can stop this error appearing?

Answer 1

You could cast it to <any> or extend the jquery typing to add your own method.

 (<any>$("div.printArea")).printArea();

//Or add your own custom methods (Assuming this is added by yourself as a part of custom plugin)

interface JQuery {
    printArea():void;
}