export function plotExtent(mark: any, filter: any, channel: any, domainAttr: any, niceAttr: any): any;
export function extentX(mark: any, filter: any): any;
export function extentY(mark: any, filter: any): any;
export function filteredExtent(filter: any, column: any): undefined[];
export namespace xext {
    let x: string[];
}
export namespace yext {
    let y: string[];
}
export namespace xyext { }
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