optimize code to fix lint warnings

packages/esm-billing-app/src/claims/claims-management/header/summary-header.component.tsx

@@ -1,5 +1,5 @@
 import { DatePicker, DatePickerInput } from '@carbon/react';
-import React, { useState, useEffect } from 'react';
+import React, { useState, useEffect, useMemo } from 'react';
 import { useTranslation } from 'react-i18next';
 import styles from './summary-header.scss';
 
@@ -15,9 +15,12 @@ interface ClaimsSummaryHeaderProps {
 const ClaimSummaryHeader: React.FC<ClaimsSummaryHeaderProps> = ({ filters, onFilterChanged }) => {
   const { t } = useTranslation();
 
-  const today = new Date();
-  const sixMonthsAgo = new Date(today);
-  sixMonthsAgo.setMonth(today.getMonth() - 6);
+  const today = useMemo(() => new Date(), []);
+  const sixMonthsAgo = useMemo(() => {
+    const date = new Date(today);
+    date.setMonth(today.getMonth() - 6);
+    return date;
+  }, [today]);
 
   useEffect(() => {
     if (!filters.fromDate && !filters.toDate) {

packages/esm-billing-app/src/claims/claims-management/main/claims-summary-chart.component.tsx

@@ -2,30 +2,33 @@ import React, { useEffect, useState } from 'react';
 import { BarChartOptions, GroupedBarChart, ScaleTypes } from '@carbon/charts-react';
 import useClaimsAggregate from '../../../hooks/useClaimsAggregate';
 
+interface MetricData {
+  summaryGraph: { group: string; month: string; value: number }[];
+}
+
 const ClaimsSummaryChart = () => {
-  const [metrics, setMetrics] = useState({ summaryGraph: [] });
+  const [metrics, setMetrics] = useState<MetricData>({ summaryGraph: [] });
 
   const { isLoading, summarizedData, error } = useClaimsAggregate();
 
-  if (isLoading) {
-    return <div>Loading data...</div>;
-  }
-
-  if (error) {
-    return <div>Error loading claims data</div>;
-  }
-
   useEffect(() => {
-    if (summarizedData.length) {
+    if (summarizedData?.length) {
       const transformedData = summarizedData.flatMap((item) => [
         { group: 'Claimed', month: item.month, value: item.claimedTotal },
         { group: 'Approved', month: item.month, value: item.approvedTotal },
       ]);
-
       setMetrics({ summaryGraph: transformedData });
     }
   }, [summarizedData]);
 
+  if (isLoading) {
+    return <div>Loading data...</div>;
+  }
+
+  if (error) {
+    return <div>Error loading claims data: {error.message}</div>;
+  }
+
   const options: BarChartOptions = {
     title: 'Analysis of Claimed vs Approved Amount by Month',
     legend: {
@@ -48,7 +51,7 @@ const ClaimsSummaryChart = () => {
   };
 
   return (
-    <div style={{ padding: '2rem' }}>
+    <div style={{ padding: '2rem' }} aria-label="Claims Summary Chart">
       <GroupedBarChart data={metrics.summaryGraph} options={options} />
     </div>
   );