import { ParserRuleContext } from 'antlr4ts';
import { ApexType } from '../type/ApexMethod.js';
import { TypeRegistry } from '../type/TypeRegistry.js';
import { BaseListener } from './baseListener.js';
export declare abstract class BaseReturnMutator extends BaseListener {
    private readonly returnValue;
    constructor(returnValue: string, typeRegistry?: TypeRegistry);
    enterReturnStatement(ctx: ParserRuleContext): void;
    protected abstract isEligibleReturnType(apexType: ApexType): boolean;
    private isMutableReturn;
}