import type { SensitiveInfoOptions } from '../sensitive-info.nitro';
/** Maximum byte length accepted for an entry key. */
export declare const MAX_KEY_BYTES = 1024;
/** Maximum byte length accepted for a service name. */
export declare const MAX_SERVICE_BYTES = 1024;
/** Maximum byte length accepted for a stored value (UTF-8 encoded). Default: 1 MiB. */
export declare const MAX_VALUE_BYTES: number;
/**
 * Validates a non-empty entry key.
 *
 * @internal
 * @throws {@link InvalidArgumentError} when the key is empty, whitespace-only, or exceeds {@link MAX_KEY_BYTES}.
 */
export declare function validateKey(key: unknown): asserts key is string;
/**
 * Validates the optional `service` field on user-supplied options. Undefined is allowed because
 * `normalizeOptions` will substitute the default; an explicit empty string is rejected.
 *
 * @internal
 */
export declare function validateService(options?: SensitiveInfoOptions): void;
/**
 * Validates the value payload of a `setItem` call.
 *
 * @internal
 * @throws {@link InvalidArgumentError} when the value is not a string or its UTF-8 encoding exceeds {@link MAX_VALUE_BYTES}.
 */
export declare function validateValue(value: unknown): asserts value is string;
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