get_current_image_src example

$this->prepare_control();

        wp_localize_script(
            'customize-views',
            '_wpCustomizeHeader',
            array(
                'data'     => array(
                    'width'         => absint( get_theme_support( 'custom-header', 'width' ) ),
                    'height'        => absint( get_theme_support( 'custom-header', 'height' ) ),
                    'flex-width'    => absint( get_theme_support( 'custom-header', 'flex-width' ) ),
                    'flex-height'   => absint( get_theme_support( 'custom-header', 'flex-height' ) ),
                    'currentImgSrc' => $this->get_current_image_src(),
                ),
                'nonces'   => array(
                    'add'    => wp_create_nonce( 'header-add' ),
                    'remove' => wp_create_nonce( 'header-remove' ),
                ),
                'uploads'  => $this->uploaded_headers,
                'defaults' => $this->default_headers,
            )
        );

        parent::enqueue();
    }