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

To use the getDaysInMonth function from the date-fns library, you first need to import the function and the Date type to your TypeScript file:

index.ts
import { getDaysInMonth, Date } from 'date-fns';
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After that, you can use the getDaysInMonth function by passing it a Date object and it will return the number of days in the given month:

index.ts
const date = new Date(2022, 1, 1); // February 1, 2022
const daysInMonth = getDaysInMonth(date); // 28
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You can also use destructuring to simplify the code:

index.ts
const { getDaysInMonth } = require('date-fns');

const date = new Date(2022, 1, 1); // February 1, 2022
const daysInMonth = getDaysInMonth(date); // 28
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Note that getDaysInMonth considers leap years, so it will return 29 for February in a leap year.