Typescript: Best Practices

any vs unknown

`any vs unknown`

use unknown instead in case don't know type of variable

interface IUser {
    id: number;
    name: string;
}

interface IAdminUser extends IUser{
    token: string;
}

function isAdminUser(object: unknown): object is IAdminUser {
  if (object !== null && typeof object === "object") {
    return "token" in object;
  }

  return false;
}

async function fetchUser() {
    const response = await fetch('https://api');
    
    // bad
    const badUser: any = await response.json();
    
    // good
    const goodUser: unknown = await response.json();
}