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

date-fns library provides a function yearsToQuarters to calculate the number of quarters between two dates with precision. Here is an example of how to use the function in TypeScript with type annotations:

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

const startDate: Date = new Date('2020-01-01');
const endDate: Date = new Date('2022-12-31');

const numQuarters: number = yearsToQuarters(startDate, endDate);

console.log(`Number of quarters between ${startDate.toISOString()} and ${endDate.toISOString()}: ${numQuarters}`);
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In this example, startDate and endDate are typed as Date. The function yearsToQuarters takes in two arguments of type Date and returns a number, which is the number of quarters between the two dates. The result can be stored in a variable of type number, as shown in the example.

The output of the example would be: Number of quarters between 2020-01-01T00:00:00.000Z and 2022-12-31T00:00:00.000Z: 12 which indicates that there are 12 quarters between the start and end date.