[recharts] Allow DataKey function to return null, and add missing attributes to LineProps & XAxisProps (#27751)

types/recharts/index.d.ts

@@ -9,6 +9,7 @@
 //                 Peter Keuter <https://github.com/pkeuter>
 //                 Jamie Saunders <https://github.com/jrsaunde>
 //                 Paul Melnikow <https://github.com/paulmelnikow>
+//                 Harry Cruse <https://github.com/crusectrl>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.6
 
@@ -25,7 +26,7 @@ export type TooltipFormatter = (value: string | number | Array<string | number>,
                                 entry: TooltipPayload, index: number) => React.ReactNode;
 export type ItemSorter<T> = (a: T, b: T) => number;
 export type ContentRenderer<P> = (props: P) => React.ReactNode;
-export type DataKey = string | number | ((dataObject: any) => number | [number, number]);
+export type DataKey = string | number | ((dataObject: any) => number | [number, number] | null);
 
 export type IconType = 'plainline' | 'line' | 'square' | 'rect' | 'circle' | 'cross' | 'diamond' | 'star' | 'triangle' | 'wye' | 'plainline';
 export type LegendType = IconType | 'none';
@@ -406,6 +407,7 @@ export interface LineProps extends EventAttributes, Partial<PresentationAttribut
     left?: number;
     width?: number;
     height?: number;
+    data?: object[];
     dataKey: DataKey; // As the source code states, dataKey will replace valueKey in 1.1.0 and it'll be required (it's already required in current implementation).
     label?: boolean | object | React.ReactElement<any> | ContentRenderer<any>;
     points?: Point[];
@@ -914,6 +916,7 @@ export interface XAxisProps extends EventAttributes {
     reversed?: boolean;
     // see label section at http://recharts.org/#/en-US/api/XAxis
     label?: string | number | Label | LabelProps;
+    allowDuplicatedCategory?: boolean;
 }
 
 export class XAxis extends React.Component<XAxisProps> { }