/**
 * GraphSchemas - Type guards and validation for graph events and data
 *
 * Provides runtime validation for data entering the system.
 * All validators follow the pattern: (unknown) => value is Type
 */
import type { Entity, EntityId, GraphEvent, GraphSnapshot, GraphSnapshotMeta, MarkerEvent, Observation, ObservationId, ObservationSource, Relation, RelationId, EntityUpsertEvent, ObservationAddEvent, RelationAddEvent, RelationRemoveEvent, EntityDeleteEvent, ObservationDeleteEvent, SnapshotWrittenEvent, GraphStats, GraphIndex } from '../../types/graph.js';
export declare function isEntityId(value: unknown): value is EntityId;
export declare function isObservationId(value: unknown): value is ObservationId;
export declare function isRelationId(value: unknown): value is RelationId;
export declare function isObservationSource(value: unknown): value is ObservationSource;
export declare function isEntity(value: unknown): value is Entity;
export declare function isObservation(value: unknown): value is Observation;
export declare function isRelation(value: unknown): value is Relation;
export declare function isMarkerEvent(value: unknown): value is MarkerEvent;
export declare function isEntityUpsertEvent(value: unknown): value is EntityUpsertEvent;
export declare function isObservationAddEvent(value: unknown): value is ObservationAddEvent;
export declare function isRelationAddEvent(value: unknown): value is RelationAddEvent;
export declare function isRelationRemoveEvent(value: unknown): value is RelationRemoveEvent;
export declare function isEntityDeleteEvent(value: unknown): value is EntityDeleteEvent;
export declare function isObservationDeleteEvent(value: unknown): value is ObservationDeleteEvent;
export declare function isSnapshotWrittenEvent(value: unknown): value is SnapshotWrittenEvent;
export declare function isGraphEvent(value: unknown): value is GraphEvent;
export declare function isGraphStats(value: unknown): value is GraphStats;
export declare function isGraphSnapshotMeta(value: unknown): value is GraphSnapshotMeta;
export declare function isGraphSnapshot(value: unknown): value is GraphSnapshot;
export declare function isGraphIndex(value: unknown): value is GraphIndex;
/**
 * Validates that the first event in a JSONL file is a valid marker
 */
export declare function validateMarker(firstLine: string): {
    valid: true;
} | {
    valid: false;
    error: string;
};
/**
 * Parses a JSONL line into a GraphEvent
 */
export declare function parseEventLine(line: string, lineNumber: number): {
    success: true;
    event: GraphEvent;
} | {
    success: false;
    error: string;
};
/**
 * Validates entity input for upsert operations
 */
export declare function validateEntityInput(input: unknown): {
    valid: true;
    name: string;
    entityType: string;
    attrs?: Record<string, unknown>;
} | {
    valid: false;
    error: string;
};
/**
 * Validates observation input
 */
export declare function validateObservationInput(input: unknown): {
    valid: true;
    entityRef: string;
    text: string;
    source?: ObservationSource;
    timestamp?: string;
} | {
    valid: false;
    error: string;
};
/**
 * Validates relation input
 */
export declare function validateRelationInput(input: unknown): {
    valid: true;
    from: string;
    relationType: string;
    to: string;
} | {
    valid: false;
    error: string;
};
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