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

To use the startOfWeekYear function from the date-fns library in JavaScript, you need to first install the library using npm:

index.tsx
npm install date-fns
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Then, you can import the startOfWeekYear function and use it to get the start of the week-year for a specific date:

const { startOfWeekYear } = require('date-fns');

const myDate = new Date('2021-10-05'); // some date to get the start of the week-year for
const startOfWeekYearDate = startOfWeekYear(myDate); // get the start of the week-year for myDate

console.log(startOfWeekYearDate); // output: 2021-01-04T00:00:00.000Z
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In the above code, we first import the startOfWeekYear function from the date-fns library. Then, we create a date object for some arbitrary date (myDate). We call the startOfWeekYear function with myDate as an argument, which returns the start of the week-year for that date. Finally, we log the resulting date to the console.