import { Activity } from '../types.js';
/**
 * List of computed field names for activities
 */
export declare const ACTIVITY_COMPUTED_FIELDS: readonly ["artifactCount", "summary"];
/**
 * List of computed field names for sessions
 */
export declare const SESSION_COMPUTED_FIELDS: readonly ["durationMs"];
/**
 * Check if a field name is a computed field for activities
 */
export declare function isActivityComputedField(field: string): boolean;
/**
 * Check if a field name is a computed field for sessions
 */
export declare function isSessionComputedField(field: string): boolean;
/**
 * Compute the artifactCount for an activity
 */
export declare function computeArtifactCount(activity: Activity): number;
/**
 * Compute the summary for an activity
 * Delegates to existing toSummary implementation
 */
export declare function computeSummary(activity: Activity): string;
/**
 * Compute the duration in milliseconds for a session
 */
export declare function computeDurationMs(session: {
    createTime?: string;
    updateTime?: string;
}): number;
/**
 * Inject computed fields into an activity based on selected fields
 *
 * @param activity The activity to augment
 * @param selectFields The fields being selected (or undefined for default)
 * @returns Activity with computed fields added
 */
export declare function injectActivityComputedFields(activity: Activity, selectFields?: string[]): Activity & {
    artifactCount?: number;
    summary?: string;
};
/**
 * Inject computed fields into a session based on selected fields
 *
 * @param session The session to augment
 * @param selectFields The fields being selected (or undefined for default)
 * @returns Session with computed fields added
 */
export declare function injectSessionComputedFields<T extends {
    createTime?: string;
    updateTime?: string;
}>(session: T, selectFields?: string[]): T & {
    durationMs?: number;
};
/**
 * Default projection fields for activities (includes computed fields)
 */
export declare const DEFAULT_ACTIVITY_PROJECTION: string[];
/**
 * Default projection fields for sessions
 */
export declare const DEFAULT_SESSION_PROJECTION: string[];