import { Cardano } from '@cardano-sdk/core';
import { CustomError } from 'ts-custom-error';
export declare const METADATUM_LABEL = 674n;
export declare enum MessageValidationFailure {
    wrongType = "WrongType",
    oversize = "Oversize"
}
export declare type MessageValidationResult = {
    valid: boolean;
    failure?: MessageValidationFailure;
};
export declare type TxMetadataMessage = string;
export declare type TxMetadataArgs = {
    messages: TxMetadataMessage[];
};
export declare type ValidationResultMap = Map<TxMetadataMessage, MessageValidationResult>;
export declare class MessageValidationError extends CustomError {
    constructor(failures: ValidationResultMap);
}
export declare const validateMessage: (entry: unknown) => MessageValidationResult;
export declare const toTxMetadata: (args: TxMetadataArgs | string) => Cardano.TxMetadata;
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