how to use the isfunction function from the lodash library in typescript

To use the isFunction function from the lodash library in TypeScript, you need to first install the lodash library and its typings types:

index.ts
npm install lodash
npm install @types/lodash --save-dev
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After that, you can import the isFunction function and use it with type annotations like this:

index.ts
import { isFunction } from 'lodash';

function foo(val: unknown): boolean {
  return isFunction(val);
}
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In the example above, we import the isFunction function from the lodash library and use it in a function called foo. We also specify a type annotation for the input parameter val, which is of type unknown. Then, we call isFunction and return its result, which is a boolean value indicating whether the input parameter is of type function or not.

By using type annotations, you can help TypeScript to detect errors and validate types more accurately at compile-time, which can save you a lot of debugging time and effort later on.