export declare const TURN_FILE_MAX_BYTES: number;
export declare const TURN_FILES_MAX = 5;
export declare const TURN_FILES_MAX_BYTES: number;
/** Mirror of the server's RUNNER_FILE_EXTS. */
export declare const TURN_FILE_EXTS: ReadonlySet<string>;
export interface TurnFileState {
    dir: string;
    sent: number;
    bytes: number;
    names: Set<string>;
}
/** The output dir of one Assistant turn (created). The turn id becomes a safe
 *  folder name; `base` is for tests. */
export declare function turnOutputDir(turnId: string, base?: string): string;
export declare function newTurnFileState(dir: string): TurnFileState;
export type TurnFileResult = {
    ok: true;
    file: {
        name: string;
        ext: string;
        size: number;
        b64: string;
    };
} | {
    ok: false;
    reason: string;
};
/** Read one file the host reported for this turn, under the rules above. */
export declare function readTurnFile(state: TurnFileState, reportedPath: unknown): TurnFileResult;