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

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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)

declare global {
    interface JQuery {
        printArea(): void;
    }
}

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