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

Assuming you've installed the date-fns package, you can use the endOfDecade function as follows:

index.ts
import { endOfDecade } from 'date-fns';

const date = new Date('2020-05-15');
const endOfDecadeDate = endOfDecade(date);

console.log(endOfDecadeDate); // output: 2019-12-31T23:59:59.999Z
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In the above code, we imported the endOfDecade function from the date-fns package, created a new Date object with a specific date, and passed it to the endOfDecade function (which returns the end date of the decade that date falls in). Finally, we logged the output to the console.

Note that the date-fns library supports many other useful functions for working with dates, so be sure to check its documentation for more information.