TypeScript 范围的“this”问题

问：

我的代码片段：

class MyClass {
    name = "MyClass";

    // traditional method definition
    getName1(){
        return this.name;
    }

    // method defined as an arrow function
    getName2 = () => {
        return this.name;
    }

    // traditional method definition using a this parameter
    getName3(this: MyClass){
        return this.name;
    }
}

const c = new MyClass();
const obj = {
    name: "obj",
    getName1: c.getName1,
    getName2: c.getName2,
    getName3: c.getName3
};

const g = c.getName3;

console.log(c.getName1());
// "MyClass" because this is called in the context of c
// using a traditional method definition getName1

console.log(c.getName2());
// "MyClass" because this is called in the context of c
// using an arrow function getName2

console.log(c.getName3());
// "MyClass" because this is called in the context of c
// using a traditional method definition getName3, having
// a this parameter that statically enforce the context of c

console.log(obj.getName1()); 
// "obj" because this is called in the context of obj
// using the MyClass traditional method definition getName1()
// and assigning it to obj's getName1 property

console.log(obj.getName2()); 
// "MyClass" because this is called in the context of obj
// using an arrow function getName2 and assigning it 
// to obj's getName2 property, but which will preserve c's context
// nonetheless

console.log(obj.getName3()); 
// "obj" but why? Isn't the context of this enforced as that of MyClass? Shouldn't I get
// « The 'this' context of type 'obj' is not assignable to method's 'this' of type 'MyClass' »

console.log(g()); 
// Error, the 'this' context of type 'void' is not assignable to method's 'this' of type 'MyClass'.
// but isn't g declared in the global this context?

我的问题在评论中突出显示，但我仍将将它们列出如下：

1. 为什么显示？强制执行的上下文不是 的上下文吗？我不应该得到类似的东西吗？console.log(obj.getName3());"obj"thisMyClass

类型为“obj”的“this”上下文不能分配给方法的“this” 类型为“MyClass”

2. 我知道它不是在对象/类的上下文中声明的，但它不是在全局对象上下文中声明的，因此应该引用？如果是这样，那么为什么我会得到以下内容：gthisglobalThis

类型为“void”的“this”上下文不可分配给方法的“this” 类型为“MyClass”。