/**
 * Auto-fire a PRODUCT_VIEW event once per product page load.
 *
 * On Shopify storefronts, the liquid block renders `.primestyle-tryon-root`
 * elements with `data-product-id` and `data-product-title`. The first mounted
 * root per (sessionId, productId) tuple is the signal that a customer looked
 * at a product page — we log once, throttled so SPA re-mounts or multiple
 * widgets on the same page don't double-log.
 *
 * Backend scales this into the top step of the Engagement Funnel and the
 * control-cohort denominator for "vs. Decision Engine" metrics.
 */
export declare function maybeFireProductView(root: Element): void;
/**
 * Wire all `.primestyle-tryon-root` elements on the page so the first mount
 * logs a PRODUCT_VIEW. Safe to call multiple times — deduped by product id.
 */
export declare function installProductViewTracking(): void;
