All of these functions are in the BeRocket_Product_Preview class as static functions.
init ()
Function for initializing scripts.
br_get_template_part( $name = ” )
Get template part (for templates like the slider).
Default templates are placed in the plugin folders woocommerce-product-preview/templates.
To rewrite the template in your theme folder create folder with name woocommerce-product-preview and places new template with identical name in this folder.
get_preview_button()
Display Quick View button and hidden product preview window in products loop.