import type { CxChartSpace } from './chartex';
/** Best-effort sniff: returns true if `bytes` starts with a `cx:chartSpace` root. */
export declare function isChartExBytes(bytes: Uint8Array | string): boolean;
export declare function parseChartExXml(bytes: Uint8Array | string): CxChartSpace;
export declare function serializeChartExSpace(space: CxChartSpace): string;
export declare function chartExToBytes(space: CxChartSpace): Uint8Array;