import { UnitModel } from '../../unit';
export declare function zindex(model: UnitModel): Partial<Record<import("../../../vega.schema").VgEncodeChannel, import("../../../vega.schema").VgValueRef | (import("../../../vega.schema").VgValueRef & {
    test?: string;
})[]>>;
//# sourceMappingURL=zindex.d.ts.map