how to use the startofisoweekyear function from the date-fns library in typescript

To use the startOfISOWeekYear function from the date-fns library in TypeScript, you need to do the following:

1. Install date-fns by running the following command in your terminal:

   npm install date-fns
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2. Import the function into your TypeScript file by adding the following line at the top of your file:

   index.ts
   import { startOfISOWeekYear } from 'date-fns';
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3. Call the startOfISOWeekYear function with a Date object as its argument. For example, to get the start of the 2022 ISO week year, you can do the following:

   index.ts
   const date = new Date('2022-01-01');
   const startOfISOWeekYear2022 = startOfISOWeekYear(date);
   console.log(startOfISOWeekYear2022);
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   This will output the start of the 2022 ISO week year as a Date object.

   Note that the startOfISOWeekYear function returns a new Date object with the time set to midnight, so you may need to format the result using the format function from date-fns if you want to display it in a different format.