import { ExecutionEngine } from '../interfaces/engine';
export declare function opCat(e: ExecutionEngine): void;
export declare function opSubStr(e: ExecutionEngine): void;
export declare function opLeft(e: ExecutionEngine): void;
/**
 * TODO: check if correct
 * @param e
 */
export declare function opRight(e: ExecutionEngine): void;
export declare function opSize(e: ExecutionEngine): void;