import { BaseTokenReader } from './BaseTokenReader';
import { Lexeme } from '../models/Lexeme';
/**
 * Reads SQL parameter tokens (@param, :param, $param, ?, ${param})
 */
export declare class ParameterTokenReader extends BaseTokenReader {
    constructor(input: string);
    /**
     * Try to read a parameter token
     */
    tryRead(previous: Lexeme | null): Lexeme | null;
}