React Gradiant de style graphiques natifs
const chartConfig = {
backgroundGradientFrom: "#1E2923",
backgroundGradientFromOpacity: 0,
backgroundGradientTo: "#08130D",
backgroundGradientToOpacity: 0.5,
color: (opacity = 1) => `rgba(26, 255, 146, ${opacity})`,
strokeWidth: 2, // optional, default 3
barPercentage: 0.5,
useShadowColorFromDataset: false // optional
};
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