/**
 * Pi coding agent backend plugin.
 * 通过 `pi --mode json -p` 驱动 agent，JSON 事件流输出。
 */
import { CliAgentBackend, type BaseCliSession, type ParsedOutput } from "../agent/cli-base.js";
import type { AgentSessionActivity, SessionConfig, ExecHooks } from "../agent/types.js";
interface PiSession extends BaseCliSession {
    sessionLogPath?: string;
}
export default class PiBackend extends CliAgentBackend<PiSession> {
    constructor();
    command(): string;
    needsStableUserPrefix(): boolean;
    buildSession(config: SessionConfig): PiSession;
    buildInput(session: PiSession, message: string): {
        args: string[];
        stdin?: string;
    };
    protected isProbeError(err: any): boolean;
    protected getExecHooks(session: PiSession): ExecHooks;
    parseOutput(stdout: string, session: PiSession): ParsedOutput;
    protected loadSessionTranscript(session: PiSession): Promise<{
        sources: {
            path: string;
            role: string;
        }[];
        backend: string;
        agentSessionId: string;
        events: Iterable<import("../agent/types.js").TranscriptEvent> | AsyncIterable<import("../agent/types.js").TranscriptEvent>;
    }>;
    protected refreshActivity(sessionId: string, activity: AgentSessionActivity): void;
    protected probeSessionFileMtime(session: PiSession): number | null;
    private scanJsonl;
    private getJsonlPath;
    private readLastLines;
}
export declare function encodePiSessionDir(cwd: string): string;
export {};