import { type Express } from 'express';
/**
 * Generic OAuth redirect target for OAuth providers (implicit + PKCE).
 *
 * The callback page always POSTs the result to `/api/oauth-result`, which
 * the UI polls via the GET counterpart — the server holds the single
 * pending result in memory between the two calls. It ALSO best-effort
 * `window.opener.postMessage`s when an opener is present, as a faster
 * same-origin shortcut. The POST must not be conditional on a missing
 * opener: in the standalone thin-bridge float the UI is always loaded
 * cross-origin from the local server (`node-server serves no UI in any
 * mode`), so the popup's opener origin never matches `window.location.origin`
 * on the receiving end and the message is silently dropped even when
 * `window.opener` is non-null (e.g. GitHub, which does not sever it via
 * COOP) — leaving the poll as the only path that can actually deliver the
 * result.
 */
export declare function registerOAuthCallbackRoutes(app: Express): void;