/**
 * Structured input validation errors for the contracts leaf.
 *
 * These mirror the kernel's `KernelInputError` pattern: a `TypeError`
 * subclass carrying a stable error code and a label parameterised message.
 * The contracts leaf and the kernel each own their own class so neither
 * package depends on the other; message text is byte-identical by convention.
 */
/** Stable error codes for contracts-leaf input validation. */
export declare const CONTRACTS_INPUT_ERROR_CODES: {
    readonly NON_EMPTY_STRING_REQUIRED: "contracts_non_empty_string_required";
    readonly NON_NEGATIVE_INTEGER_REQUIRED: "contracts_non_negative_integer_required";
    readonly SHA256_HASH_REQUIRED: "contracts_sha256_hex_required";
    readonly OBJECT_REQUIRED: "contracts_object_required";
};
export type ContractsInputErrorCode = (typeof CONTRACTS_INPUT_ERROR_CODES)[keyof typeof CONTRACTS_INPUT_ERROR_CODES];
/** Typed error for contracts-leaf input validation failures (identity, SQL row decoding). */
export declare class ContractsInputError extends TypeError {
    readonly code: ContractsInputErrorCode;
    constructor(code: ContractsInputErrorCode, label: string);
}
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