by Anthony Fu @antfu
Implement the built-in Readonly<T> generic without using it.
Constructs a type with all properties of T set to readonly, meaning the properties of the constructed type cannot be reassigned.
For example
interface Todo {
title: string
description: string
}
const todo: MyReadonly<Todo> = {
title: 'Hey',
description: 'foobar'
}
todo.title = 'Hello' // Error: cannot reassign a readonly property
todo.description = 'barFoo' // Error: cannot reassign a readonly property
