import { ColumnDefinition, DefaultSchemaGrammar, SchemaCommand } from '../../schema';
/**
 * MySQL schema grammar. Differs from the standard grammar in identifier quoting
 * (backticks), UNSIGNED/AUTO_INCREMENT syntax, TINYINT(1) booleans, JSON in
 * place of native arrays, and the single-statement MODIFY COLUMN / DROP FOREIGN
 * KEY / DROP PRIMARY KEY forms.
 *
 * Unlike PostgreSQL and SQLite, MySQL's `CREATE INDEX` has no `IF NOT EXISTS`
 * clause, so `createIndexSql` ignores that flag here: a `Schema.createIfNotExists`
 * table re-run against MySQL is idempotent for the table itself, but re-running
 * it after the index already exists still fails with a duplicate-key-name error.
 * Track applied migrations (skip `up()` once it already ran) rather than relying
 * on index-level idempotency on this engine.
 */
export declare class MysqlSchemaGrammar extends DefaultSchemaGrammar {
    protected createIndexSql(table: string, columns: string[], name?: string, unique?: boolean): string;
    protected wrap(name: string): string;
    protected getAutoIncrementType(column: ColumnDefinition): string;
    protected modifyUnsigned(column: ColumnDefinition): string;
    protected booleanLiteral(value: boolean): string;
    protected arrayLiteral(value: any[]): string;
    protected getType(column: ColumnDefinition): string;
    protected compileChangeColumn(table: string, column: ColumnDefinition): string[];
    protected compileDropIndex(table: string, index: string): string;
    protected compileCommand(table: string, command: SchemaCommand): string[];
    compileRename(from: string, to: string): string;
    compileTableExists(table: string): {
        sql: string;
        bindings: any[];
    };
}