import { ParserRuleContext } from 'antlr4ts';
import { TypeRegistry } from '../type/TypeRegistry.js';
import { BaseListener } from './baseListener.js';
export declare class EmptyReturnMutator extends BaseListener {
    constructor(typeRegistry?: TypeRegistry);
    enterReturnStatement(ctx: ParserRuleContext): void;
    private getTypeInfoForMutation;
    isEmptyValue(type: string, expressionText: string): boolean;
}