How to find the hCaptcha checker callback?

Question

JavaScript

Almost the same as reCaptcha. In general, there is a question of automating hCaptcha verification, everything goes fine except for

}, {
            key: "renderCaptcha",
            value: function() {
                if (this.state.isApiReady) {
                    var e = hcaptcha.render(this.ref.current, o(o({}, this.props), {}, {
                        "error-callback": this.handleError,
                        "expired-callback": this.handleExpire,
                        callback: <b>this.handleSubmit</b>
                    }));
                    this.setState({
                        isRemoved: !1,
                        captchaId: e
                    })
                }
            }
        }, {

finding the token validation callback function, how to find this.handleSubmit function?