/**
 * Pure log-line builders for the Feishu WebSocket connection lifecycle.
 *
 * `createFeishuTransport` wires the SDK's connection callbacks to these, so a
 * dropped or failed connection is always surfaced on the host's stderr instead
 * of disappearing into the SDK's reconnect loop. The wording lives here — pure
 * and free of any SDK dependency — so it is unit-testable. Ported verbatim from
 * claudemux.
 */
/** The connection dropped and the SDK has begun a reconnect cycle. */
export declare function reconnectingLogLine(): string;
/** The reconnect cycle restored the connection. */
export declare function reconnectedLogLine(): string;
/**
 * The SDK reported a connection error and stopped — a non-recoverable error,
 * or an exhausted retry budget. The channel needs a restart to reconnect.
 */
export declare function connectionErrorLogLine(err: unknown): string;
/**
 * The initial connection never came up within the startup grace window.
 * `sdkGaveUp` is true when the SDK has already stopped retrying on its own,
 * false when it is still looping and the channel is the one stopping it.
 */
export declare function startupTimeoutLogLine(graceMs: number, sdkGaveUp: boolean): string;
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