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

The getISOWeek() function from the date-fns library in JavaScript can be used to get the ISO week of a given date. Here's an example of how to use it:

index.tsx
const dateFns = require('date-fns');

const someDate = new Date('2021-06-17'); // Thursday
const isoWeek = dateFns.getISOWeek(someDate); // Returns 24

console.log(isoWeek); // 24
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In this example, someDate is created as a JavaScript Date object representing June 17th, 2021. The getISOWeek() function is then called with someDate as the argument, and the resulting ISO week (24 in this case) is stored in the isoWeek variable. Finally, isoWeek is logged to the console.

Note that the date-fns library is widely used and has many other date-related functions that can be helpful in your code.