import ' rollup-plugin-inject-process-env';
import type { Attribution } from "@xapp/chat-widget-core";
/**
 * Builds the attribute set for one outgoing message.
 *
 * Returns a **fresh object every call**. That is the point of this function, not an
 * incidental detail: the chat server's `_attributes` is a single object that lives for
 * the whole conversation, so writing attribution into it directly means the first value
 * seen is the value sent forever. A visitor who navigates within an SPA to a page with a
 * different `gclid` would keep sending the original one, which contradicts the
 * most-recent-click-wins behaviour `attribution.ts` documents and the ad platforms
 * assume.
 *
 * Precedence: whatever the host page set explicitly wins, because that was deliberate.
 * Everything else comes from the current attribution read.
 *
 * @param hostAttributes attributes the host page set at session start
 * @param attribution the attribution resolved for this message
 */
export declare function mergeAttribution(hostAttributes: Record<string, unknown> | undefined, attribution: Attribution): Record<string, unknown>;