/** @internal BroadcastChannel name for backward-compat cross-tab handoff messaging. */
export declare const FABRIC_AUTH_CHANNEL = "rayfin_fabric_auth";
/**
 * Bridge for backward compatibility with legacy broker redirect flows.
 *
 * Legacy brokers redirect the popup to the SPA's callback URL with handoff
 * params instead of using postMessage. This function detects that scenario,
 * forwards the params to the opener tab, and closes the popup.
 *
 * Delivery: postMessage when `window.opener` exists, BroadcastChannel otherwise.
 *
 * Call early in your callback page. Returns `true` if bridge fired (skip
 * other callback handling), `false` if no handoff params detected.
 *
 * @deprecated Remove once legacy redirect flow is fully retired.
 * @returns Whether a bridge message was sent.
 */
export declare function bridgeFabricCallback(): boolean;
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