how to use the isdate function from the underscore library in typescript

To use the isDate function from the Underscore library in TypeScript, you first need to import the Underscore library and appropriate type definitions. Here's an example:

index.ts
import * as _ from 'underscore';

const date: Date = new Date();
const isItDate: boolean = _.isDate(date);
console.log(isItDate); // true
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In the example above, we import the entire Underscore library using a wildcard import and assign it to the _ variable. Then, we create a new Date object and pass it to the _.isDate function, which returns a boolean indicating whether the input is a valid Date object.

Note that we also declare a Date type for the date variable to take advantage of TypeScript's type checking. This is not strictly necessary, but can help catch errors at compile time.