import { AsyncAPISchemaDefinition } from '@asyncapi/parser/esm/spec-types/v3';
import { Field } from 'protobufjs';
export declare function visit(obj: AsyncAPISchemaDefinition, field: Field): void;
export declare function protocGenValidate(option: {
    [key: string]: any;
}, obj: AsyncAPISchemaDefinition): void;
export declare function isOptional(field: Field): boolean;