/**
 * OpenCV.js surfaces C++ exceptions as a raw number: a pointer to the
 * exception object in the WASM heap. Turns it into the readable message
 * where possible.
 */
export declare const decodeCvException: (e: unknown) => string;
/**
 * Runs an OpenCV call without letting errors escape. Errors are logged,
 * passed to onError (if any), and the call returns undefined.
 */
export declare const cvCall: <T>(fn: () => T, onError?: (msg: string) => void) => T | undefined;