/**
 * Client-side input validation.
 *
 * Produces clear {@link ValidationError}s before submission instead of opaque
 * on-chain or WebCrypto failures. The smart wallet imposes no signer-count caps
 * (unlike a policy-based account), so validation here is about shapes and
 * ranges: addresses, amounts, expirations, and secp256r1 public keys.
 *
 * @packageDocumentation
 */
/**
 * Validate that a string is a Stellar account (`G…`) or contract (`C…`) address.
 *
 * @throws {ValidationError} If the address is missing or malformed.
 */
export declare function validateAddress(address: string, fieldName?: string): void;
/**
 * Validate that an amount is a positive, finite number.
 *
 * @throws {ValidationError} If the amount is not a positive number.
 */
export declare function validateAmount(amount: number, fieldName?: string): void;
/**
 * Validate a signer expiration.
 *
 * The contract types signer expiration as `Option<u64>` UNIX seconds, so the
 * accepted range here is the `u64`-compatible safe-integer range: a
 * non-negative integer up to `Number.MAX_SAFE_INTEGER` (the kit carries the
 * value as a JS number before converting to `BigInt`). `undefined` means "no
 * expiration". Capping at `u32` (the old bound) would reject post-2106
 * timestamps the contract accepts.
 *
 * @throws {ValidationError} If the expiration is out of range.
 */
export declare function validateExpiration(expiration: number | undefined, fieldName?: string): void;
/**
 * Validate a secp256r1 public key: 65 bytes, uncompressed (`0x04`) prefix.
 *
 * @throws {ValidationError} If the key is not a valid uncompressed EC point.
 */
export declare function validateSecp256r1PublicKey(publicKey: Uint8Array, fieldName?: string): void;
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