import { type Dictionary } from '@mikro-orm/core';
import type { Column, ForeignKey, IndexDef, SchemaDifference, TableDifference } from '../typings.js';
import type { DatabaseSchema } from './DatabaseSchema.js';
import type { DatabaseTable } from './DatabaseTable.js';
import type { AbstractSqlPlatform } from '../AbstractSqlPlatform.js';
/**
 * Compares two Schemas and return an instance of SchemaDifference.
 */
export declare class SchemaComparator {
  #private;
  constructor(platform: AbstractSqlPlatform);
  /**
   * Returns a SchemaDifference object containing the differences between the schemas fromSchema and toSchema.
   *
   * The returned differences are returned in such a way that they contain the
   * operations to change the schema stored in fromSchema to the schema that is
   * stored in toSchema.
   */
  compare(fromSchema: DatabaseSchema, toSchema: DatabaseSchema, inverseDiff?: SchemaDifference): SchemaDifference;
  /**
   * Returns the difference between the tables fromTable and toTable.
   * If there are no differences this method returns the boolean false.
   */
  diffTable(
    fromTable: DatabaseTable,
    toTable: DatabaseTable,
    inverseTableDiff?: TableDifference,
  ): TableDifference | false;
  /**
   * Try to find columns that only changed their name, rename operations maybe cheaper than add/drop
   * however ambiguities between different possibilities should not lead to renaming at all.
   */
  private detectColumnRenamings;
  /**
   * Try to find indexes that only changed their name, rename operations maybe cheaper than add/drop
   * however ambiguities between different possibilities should not lead to renaming at all.
   */
  private detectIndexRenamings;
  diffForeignKey(key1: ForeignKey, key2: ForeignKey, tableDifferences: TableDifference): boolean;
  /**
   * Returns the difference between the columns
   */
  diffColumn(fromColumn: Column, toColumn: Column, fromTable: DatabaseTable, logging?: boolean): Set<string>;
  diffEnumItems(items1?: string[], items2?: string[]): boolean;
  diffComment(comment1?: string, comment2?: string): boolean;
  /**
   * Finds the difference between the indexes index1 and index2.
   * Compares index1 with index2 and returns index2 if there are any differences or false in case there are no differences.
   */
  diffIndex(index1: IndexDef, index2: IndexDef): boolean;
  /**
   * Checks if the other index already fulfills all the indexing and constraint needs of the current one.
   */
  isIndexFulfilledBy(index1: IndexDef, index2: IndexDef): boolean;
  /**
   * Compare advanced column options between two indexes.
   */
  private compareIndexColumns;
  /**
   * Compare two arrays for equality (order matters).
   */
  private compareArrays;
  diffExpression(expr1: string, expr2: string): boolean;
  parseJsonDefault(defaultValue?: string | null): Dictionary | string | null;
  hasSameDefaultValue(from: Column, to: Column): boolean;
  private mapColumnToProperty;
  private log;
}