Google reCaptcha reset in TypeScript
<p>I'm developing Angular 2 + TypeScript app.
I need to reset reCaptcha if form is invalid.
But in my typescript code when I write <code>grecaptcha.reset();</code>, I get error: <code>Can not resolve symbol 'grecaptcha'</code> </p>

<p>How can I reset reCaptcha or resolve/declare <code>grecaptcha</code> variable and where?</p>