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

To use the isLeapYear function from the date-fns library in TypeScript, you can do the following:

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

index.ts
npm install date-fns
21 chars
2 lines

2. Import the isLeapYear function from the date-fns library:

index.ts
import { isLeapYear } from 'date-fns';
39 chars
2 lines

3. Use the isLeapYear function by passing in a Date or a number representing a year:

index.ts
const date: Date = new Date('2020-01-01');
const isLeapYearResult: boolean = isLeapYear(date);

const year: number = 2020;
const isLeapYearNumberResult: boolean = isLeapYear(year);

console.log(isLeapYearResult); // true
console.log(isLeapYearNumberResult); // true
266 chars
9 lines

The isLeapYear function returns a boolean value indicating whether the year is a leap year (true) or not (false).