A variable of type any can be assigned with anything.
let a: any = 1;
a = "Hello";
a = true;
"In essence, by using any in TypeScript, you are essentially opting out of type checking. This means that the compiler allows any type of value to be assigned to a variable of type any without enforcing type constraints or providing type-related error checking.
If you want to use TypeScript, you should avoid using any as much as possible.
When you declare a variable with the type unknown, you can assign any value to it, similar to the any type. However, when attempting to access a property or value from this variable, TypeScript will generate an error. This error indicates that the property or value you are trying to access on a variable of the unknown type may not exist.
Using unknown requires you to incorporate a check before accessing any properties or values from a variable of this type, ensuring that the necessary validation is in place.
let a: unknown = 30;
let b = a === 123; // boolean
let c = a + 10; // Error TS2571: Object is of type 'unknown'.