/**
 * Input validation helpers.
 *
 * All functions throw a descriptive Error on invalid input so callers can
 * surface actionable messages without catching generic exceptions.
 */
import type { ChallengeAction } from "../types/liveness";
/** Returns true when s is a non-empty string after trimming. */
export declare function isNonEmpty(s: unknown): s is string;
/**
 * Validates that apiKey looks like a SmartComply public key.
 * Format: pk_live_<...> or pk_test_<...>
 */
export declare function validateApiKey(apiKey: unknown): void;
/** Throws if clientId is not a valid UUID v4. */
export declare function validateClientId(clientId: unknown): void;
/** Throws if countryCode is not a 2-letter ISO 3166-1 alpha-2 code. */
export declare function validateCountryCode(countryCode: unknown): void;
/** Throws if the blob is empty or exceeds the given byte limit. */
export declare function validateFileSize(blob: Blob | File, maxBytes: number, label: string): void;
/** Throws if the blob's MIME type is not in the accepted image types list. */
export declare function validateImageType(blob: Blob | File, label: string): void;
/** Combined validation for a document image blob. */
export declare function validateDocumentBlob(blob: Blob | File): void;
/** Combined validation for a liveness video blob. */
export declare function validateVideoBlob(blob: Blob): void;
/** Combined validation for a snapshot / autoshot blob. */
export declare function validateSnapshotBlob(blob: Blob): void;
/** Throws if any entry in actions is not a backend-accepted challenge action. */
export declare function validateChallengeActions(actions: unknown[]): void;
/** Type-guard that narrows a string[] to ChallengeAction[]. */
export declare function toChallengeActions(actions: string[]): ChallengeAction[];
/** Throws if identifier is missing or too short to be plausible. */
export declare function validateIdentifier(identifier: unknown, minLength?: number): void;
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