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

To use the isWeakMap function from the Underscore.js library in TypeScript, first make sure to install the @types/underscore package to get the necessary type definitions.

Then, we can import the isWeakMap function from the Underscore library and use it in our TypeScript code. Here is an example code snippet:

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

function exampleFunction(arg: any): boolean {
  if (_.isWeakMap<any, any>(arg)) {
    // arg is a WeakMap
    return true;
  } else {
    // arg is not a WeakMap
    return false;
  }
}
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In the above example, we import the Underscore library and define an example function that takes an argument of type any. We use the isWeakMap function with TypeScript generics to check if the argument is a WeakMap or not, and return a boolean value accordingly.

Note that we need to specify the types of the key and value for the isWeakMap function to work properly. In this example, we use any type for both key and value, but you may use more specific types depending on your use case.