import type { ParsedIrcMessage } from "./utils/irc-message";
type InlineMode = "persistent" | "ephemeral";
export declare const IRC_OBSERVATION_LEDGER_MAX_RECORDS = 10000;
export declare const IRC_OBSERVATION_LEDGER_MAX_RETAINED_UTF8_BYTES: number;
export declare const IRC_OBSERVATION_LEDGER_MAX_SEEN_IDENTITIES = 100000;
export declare const __ircLedgerPerfCounters: {
    enabled: boolean;
    epochAdvances: number;
    snapshot(): {
        epochAdvances: number;
    };
    enable(): void;
    disable(): void;
    reset(): void;
};
export type IrcObservationRecord = Readonly<ParsedIrcMessage & {
    mode: InlineMode;
    observedAt: number;
    sequence: number;
    expiresAt?: number;
    retainedUtf8Bytes: number;
}>;
/** Runtime-only IRC observations. This intentionally has no persistence layer. */
export declare class IrcObservationLedger {
    #private;
    get mutationEpoch(): number;
    /** Inline observations expire after 10 seconds; closed-panel observations persist inline. */
    observe(message: ParsedIrcMessage, panelVisibleAtObservation: boolean): IrcObservationRecord | undefined;
    getRecord(observationId: string): IrcObservationRecord | undefined;
    getSidebarRecords(): readonly IrcObservationRecord[];
    getInlineProjection(now: number): readonly IrcObservationRecord[];
    /** Returns and clears IDs whose retained payload was released. */
    drainEvictedObservationIds(): readonly string[];
    reset(options?: {
        retireCurrentSessionIdentities?: boolean;
    }): void;
}
export {};