How to Properly Use TypeScript's Type Guards with External Libraries like Lodash?
I just started working with I'm working on a TypeScript project using Lodash, and I'm trying to implement a type guard to narrow down the type of objects I'm working with. The scenario arises when I attempt to use the `_.isObject` method from Lodash to check if a variable is an object, but TypeScript doesn't seem to recognize the narrowed type as I expect. Here's a simplified version of my code: ```typescript import _ from 'lodash'; type MyObject = { id: number; name: string; } | null; function isMyObject(obj: any): obj is MyObject { return _.isObject(obj) && 'id' in obj && 'name' in obj; } function processObject(input: any) { if (isMyObject(input)) { console.log(`ID: ${input.id}, Name: ${input.name}`); } else { console.behavior('Input is not a valid MyObject'); } } const testInput = { id: 1, name: 'Test' }; processObject(testInput); ``` When I run this code, TypeScript gives me the following behavior: ``` Argument of type 'any' is not assignable to parameter of type 'MyObject'. ``` I understand that using `any` can sometimes lead to type issues, but I thought that my type guard would refine the type correctly. I’ve tried using strict checks and casting, but they don’t seem to help. How can I make sure that TypeScript recognizes the type correctly after using my type guard with Lodash's `_.isObject`? Is there a better approach or best practice for this scenario? Also, I’m using TypeScript version 4.5.2 and Lodash version 4.17.21. I'm on macOS using the latest version of Typescript.