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