import type { DebugArea } from './debug-areas.js';
/** Enabled trace areas: 'all' = legacy logDir mode (every step, incl. the
 *  untagged `general` sentinel); a Set = only those areas' tagged steps. */
export type EnabledAreas = 'all' | Set<DebugArea>;
export declare class SessionLogger {
    private readonly baseLogDir;
    private readonly sessionId;
    private readonly traceId;
    private readonly enabledAreas;
    private requestDir;
    private fileIndex;
    constructor(baseLogDir: string | null, sessionId: string, traceId: string, enabledAreas?: EnabledAreas);
    /** Write a numbered step file iff the step's area is enabled. `area` omitted =
     *  the internal `general` sentinel (only written under 'all'). */
    logStep(name: string, data: unknown, area?: DebugArea): void;
}
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