import type { ChartPositionChannel, MaterializedChannel } from './types.js';
/** Reads positional identity without coupling it to one channel record key. */
export declare function readMaterializedPositionChannel(name: string, channel: MaterializedChannel): ChartPositionChannel | undefined;
/** Retains positional identity when a composed mark namespaces channel keys. */
export declare function preserveMaterializedPositionChannel(name: string, channel: MaterializedChannel): MaterializedChannel;