export declare class ContractRequestError extends Error {
    readonly code: string;
    readonly exitCode: number;
    readonly field?: string;
    constructor(input: {
        code: string;
        message: string;
        exitCode: number;
        field?: string;
    });
}
export declare function contractError(input: {
    readonly code: string;
    readonly message: string;
    readonly exitCode: number;
    readonly field?: string;
}): ContractRequestError;
export declare function invalidField(field: string, message: string): never;
export declare function requiredString(record: Record<string, unknown>, field: string): string;
export declare function optionalString(record: Record<string, unknown>, field: string): string | undefined;
export declare function optionalNumber(record: Record<string, unknown>, field: string): number | undefined;
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