From ffe6ca4ceb13d3e898a2f2462fb675336b507c6b Mon Sep 17 00:00:00 2001
From: kafka <kafka@yunio.com>
Date: Thu, 3 Dec 2020 16:39:56 +0800
Subject: [PATCH] fixed BarChart Warning: Each child in a list should have a
 unique 'key' prop

---
 src/BarChart.tsx   | 2 +-
 src/HelperTypes.ts | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/BarChart.tsx b/src/BarChart.tsx
index 71348607..972879e2 100644
--- a/src/BarChart.tsx
+++ b/src/BarChart.tsx
@@ -142,7 +142,7 @@ class BarChart extends AbstractChart<BarChartProps, BarChartState> {
     flatColor: boolean;
   }) => {
     return data.map((dataset, index) => (
-      <Defs>
+      <Defs key={dataset.key ?? index}>
         {dataset.colors?.map((color, colorIndex) => {
           const highOpacityColor = color(1.0);
           const lowOpacityColor = color(0.1);
diff --git a/src/HelperTypes.ts b/src/HelperTypes.ts
index b4992023..8a50c40b 100644
--- a/src/HelperTypes.ts
+++ b/src/HelperTypes.ts
@@ -19,6 +19,9 @@ export interface Dataset {
 
   /** Override of LineChart's withScrollableDot property just for this dataset */
   withScrollableDot?: boolean;
+
+  /** Unique key **/
+  key?: string | number;
 }
 
 export interface ChartData {