/**
 * SchemaAST Differ
 *
 * Compares two SchemaAST instances and produces a detailed diff.
 * Used for:
 * - Migration generation (entity vs database)
 * - Drift detection (expected vs actual)
 * - Schema synchronization
 */
import type { SchemaAST } from './schemaAST.js';
import type { SchemaDiffResult } from './types.js';
/**
 * Options for schema diffing.
 */
export interface DiffOptions {
    /** Compare indexes */
    compareIndexes?: boolean;
    /** Compare foreign keys/relationships */
    compareRelationships?: boolean;
    /** Ignore case differences in names */
    ignoreCase?: boolean;
    /** Tables to exclude from comparison */
    excludeTables?: string[];
}
/**
 * Compares two SchemaAST instances and produces a detailed diff.
 */
export declare class SchemaASTDiffer {
    /**
     * Compare two schemas and return the differences.
     *
     * @param source - The "expected" or "desired" schema (e.g., from entities)
     * @param target - The "actual" or "current" schema (e.g., from database)
     * @param options - Diff options
     * @returns Detailed diff result
     */
    diff(source: SchemaAST, target: SchemaAST, options?: DiffOptions): SchemaDiffResult;
    /**
     * Compare two tables and return the differences.
     */
    private diffTable;
    /**
     * Compare columns between two tables.
     */
    private diffTableColumns;
    /**
     * Compare indexes between two tables.
     */
    private diffTableIndexes;
    /**
     * Compare two columns and return the difference.
     */
    private diffColumn;
    /**
     * Compare two indexes and return the difference.
     */
    private diffIndex;
    /**
     * Compare relationships at the schema level.
     */
    private diffRelationships;
    /**
     * Compare two relationships.
     */
    private diffRelationship;
    /**
     * Generate a unique key for a relationship based on its structure.
     */
    private getRelationshipKey;
    /**
     * Format a canonical type for display.
     */
    private formatType;
    /**
     * Normalize default values for comparison.
     */
    private normalizeDefault;
}
/**
 * Create a differ and run a comparison.
 * Convenience function for one-off comparisons.
 */
export declare function diffSchemas(source: SchemaAST, target: SchemaAST, options?: DiffOptions): SchemaDiffResult;
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