/**
 * `SourceSelector` — owns the runtime demotion/re-promotion state for the
 * doorbell's wake source (Q3=D policy). Emits exactly one FR-006 `source=…`
 * stderr line per transition.
 *
 * Contract: `specs/978-summary-generacy-cockpit/contracts/source-selector.md`.
 */
export type SourceMode = 'smee-attempt' | 'smee-active' | 'poll-fallback';
export type SourceReason = 'startup-no-channel' | 'startup-smee-selected' | 'startup-smee-failed' | 'smee-runtime-lost' | 'smee-re-promoted';
export interface SourceSelectorOptions {
    initial: 'smee-attempt' | 'poll-fallback';
    stderr: {
        write(chunk: string): boolean | void;
    };
    logger?: {
        warn: (msg: string) => void;
        info?: (msg: string) => void;
    };
    demoteAfterConsecutiveFailures?: number;
    demoteAfterMsWithoutSuccess?: number;
    rePromoteIntervalMs?: number;
    now?: () => number;
}
export type ModeChangeCallback = (next: SourceMode, reason: SourceReason) => void;
export declare const DEFAULT_DEMOTE_AFTER_FAILURES = 5;
export declare const DEFAULT_DEMOTE_AFTER_MS_WITHOUT_SUCCESS = 90000;
export declare const DEFAULT_RE_PROMOTE_INTERVAL_MS = 300000;
export declare class SourceSelector {
    private _current;
    private consecutiveReconnectFailures;
    private lastSuccessfulConnectAt;
    private demotedAt;
    private rePromoteTimer;
    private elapsedTicker;
    private modeChangeCbs;
    private stopped;
    private readonly initialWasSmee;
    private readonly demoteAfterFailures;
    private readonly demoteAfterMsWithoutSuccess;
    private readonly rePromoteIntervalMs;
    private readonly now;
    private readonly stderr;
    private readonly logger?;
    private pendingRePromoteEmit;
    constructor(options: SourceSelectorOptions);
    get currentSource(): SourceMode;
    onModeChange(cb: ModeChangeCallback): void;
    onReconnectAttempt(failedAttempts: number): void;
    onReconnectSuccess(): void;
    /** Refresh liveness on inbound SSE bytes (keepalive comments or payloads). */
    onSseBytes(): void;
    /** Startup `startSmeeMode` returned `transient-fail`: transition to the live
     * poll-fallback bridge so `rePromoteTimer` arms and stdout keeps flowing. */
    markStartupSmeeFailed(): void;
    observeElapsed(): void;
    stop(): void;
    private transition;
    private tickRePromote;
    private writeLine;
}
//# sourceMappingURL=source-selector.d.ts.map