/** Which row image an inline OUTPUT clause reads (mssql): writes → INSERTED, deletes → DELETED. */
export type ReturningSource = 'inserted' | 'deleted';
/** A compiled row-returning clause and where the builder must splice it. */
export interface ReturningClause {
    sql: string;
    /** 'suffix' → appended to the statement (RETURNING); 'inline' → before VALUES/WHERE (OUTPUT). */
    placement: 'inline' | 'suffix';
}
/**
 * Strategy for rendering SQL that differs between engines: placeholder style,
 * identifier quoting, pagination, and row-returning writes. One implementation
 * per supported engine.
 */
export interface Dialect {
    /** Render the i-th positional placeholder (1-based). */
    placeholder(index: number): string;
    /** Quote a table/column identifier safely. */
    quoteIdentifier(name: string): string;
    /** Render the pagination clause (leading space included), engine-correct. */
    compilePagination(limit?: number, offset?: number): string;
    /**
     * Render the clause that makes a write return rows (RETURNING / OUTPUT).
     * Empty `columns` means all columns. Throws UnsupportedEngineException
     * where the engine has no equivalent (mysql, oracle).
     */
    compileReturning(columns: string[], source: ReturningSource): ReturningClause;
}
export declare class PostgresDialect implements Dialect {
    placeholder(index: number): string;
    quoteIdentifier(name: string): string;
    compilePagination(limit?: number, offset?: number): string;
    compileReturning(columns: string[]): ReturningClause;
}
export declare class MySqlDialect implements Dialect {
    placeholder(_index: number): string;
    quoteIdentifier(name: string): string;
    compilePagination(limit?: number, offset?: number): string;
    compileReturning(): ReturningClause;
}
export declare class SqliteDialect implements Dialect {
    placeholder(_index: number): string;
    quoteIdentifier(name: string): string;
    compilePagination(limit?: number, offset?: number): string;
    compileReturning(columns: string[]): ReturningClause;
}
export declare class MssqlDialect implements Dialect {
    placeholder(index: number): string;
    quoteIdentifier(name: string): string;
    compilePagination(limit?: number, offset?: number): string;
    compileReturning(columns: string[], source: ReturningSource): ReturningClause;
}
export declare class OracleDialect implements Dialect {
    placeholder(index: number): string;
    quoteIdentifier(name: string): string;
    compilePagination(limit?: number, offset?: number): string;
    compileReturning(): ReturningClause;
}