how to use the issameisoweekyear function from date-fns in javascript

You can use the isSameISOWeekYear function from date-fns to check if two dates are in the same ISO week year. Here is an example:

index.tsx
import { isSameISOWeekYear } from 'date-fns';

const date1 = new Date('2021-01-01');
const date2 = new Date('2020-12-28');

console.log(isSameISOWeekYear(date1, date2)); // true

const date3 = new Date('2022-01-01');

console.log(isSameISOWeekYear(date1, date3)); // false
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In this example, the isSameISOWeekYear function is used to check if date1 and date2 are in the same ISO week year. Since they both fall within the ISO week year 2020, the function returns true. On the other hand, date1 and date3 fall in different ISO week years (2021 and 2022, respectively), so the function returns false.