/**
 * Query engine – evaluates MongoDB-style filter queries against documents.
 *
 * Supports:
 *   - Comparison: $eq, $ne, $gt, $gte, $lt, $lte
 *   - Set membership: $in, $nin
 *   - Pattern: $regex
 *   - Existence: $exists
 *   - Array: $elemMatch, $size, $all
 *   - Logical: $and, $or, $nor, $not
 *   - Type: $type
 *   - Text: $text / $search (full-text search across indexed fields)
 */
import type { FilterQuery } from '@digitaldefiance/suite-core-lib';
import type { BsonDocument } from '../interfaces/storage/documentTypes';
/**
 * Configure which fields are included in $text search.
 * Call this before running a filter that contains $text.
 */
export declare function setTextSearchFields(fields: string[]): void;
/**
 * Get the currently configured text search fields.
 */
export declare function getTextSearchFields(): string[];
/**
 * Compare two values for ordering (like MongoDB's BSON comparison).
 * Returns negative if a < b, 0 if equal, positive if a > b.
 */
export declare function compareValues(a: unknown, b: unknown): number;
/**
 * Deep equality check (handles primitives, arrays, plain objects, Dates).
 */
export declare function deepEquals(a: unknown, b: unknown): boolean;
/**
 * Check if a document matches a filter query.
 */
export declare function matchesFilter<T extends BsonDocument>(doc: T, filter: FilterQuery<T>): boolean;
/**
 * Apply projection to a document.
 */
export declare function applyProjection<T extends BsonDocument>(doc: T, projection: Record<string, 0 | 1>): Partial<T>;
/**
 * Sort an array of documents by a sort specification.
 */
export declare function sortDocuments<T extends BsonDocument>(docs: T[], sort: Record<string, 1 | -1>): T[];
/**
 * Tokenize a string into lowercase words (basic whitespace + punctuation split).
 */
export declare function tokenize(text: string): string[];
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