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

To use the isSameISOWeek function from the date-fns library in TypeScript, you can start by installing the library and its corresponding type declarations using the npm package manager:

index.ts
npm install date-fns
npm install -D @types/date-fns
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Then, in your TypeScript file, you can import the isSameISOWeek function from the library like this:

index.ts
import { isSameISOWeek } from 'date-fns';
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With this function imported, you can use it to compare two dates to see if they occur in the same ISO week:

index.ts
const date1 = new Date('2021-03-15');
const date2 = new Date('2021-03-16');

const isSameWeek = isSameISOWeek(date1, date2);
console.log(isSameWeek); // false
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In this example, we create two Date objects representing March 15 and March 16 of 2021. We then use the isSameISOWeek function to compare the two dates and determine whether they occur in the same ISO week. The result is false, since these dates belong to different ISO weeks.

Note that because we installed the @types/date-fns package, our TypeScript compiler can correctly identify the types of the isSameISOWeek function and its arguments, and will provide type checking and autocompletion capabilities.