typescript 错误 TS2345：“T”类型的参数不可分配给“对象”类型的参数
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error TS2345: Argument of type 'T' is not assignable to parameter of type 'object'
提问by Nenad
The code below was working fine with TypeScript 2.1.6:
下面的代码在 TypeScript 2.1.6 上运行良好：
function create<T>(prototype: T, pojo: Object): T {
// ...
return Object.create(prototype, descriptors) as T;
}
After updating to TypeScript 2.2.1, I am getting the following error:
更新到 TypeScript 2.2.1 后，出现以下错误：
error TS2345: Argument of type 'T' is not assignable to parameter of type 'object'.
错误 TS2345：“T”类型的参数不可分配给“对象”类型的参数。
回答by Nenad
Change signature of the function, so that generic type Textends type object, introduced in Typescript 2.2. Use this syntax - <T extends object>:
更改函数的签名，以便泛型类型T扩展 type object，在 Typescript 2.2 中引入。使用此语法 - <T extends object>：
function create<T extends object>(prototype: T, pojo: Object): T {
...
return Object.create(prototype, descriptors) as T;
}
回答by Seamus
The signature for Object.createwas changed in TypeScript 2.2.
Object.create在 TypeScript 2.2 中更改了签名。
Prior to TypeScript 2.2, the type definition for Object.createwas:
在 TypeScript 2.2 之前，的类型定义Object.create是：
create(o: any, properties: PropertyDescriptorMap): any;
But as you point out, TypeScript 2.2 introducedthe objecttype:
但正如你所指出的，TypeScript 2.2 引入了object类型：
TypeScript did not have a type that represents the non-primitive type, i.e. any thing that is not
number|string|boolean|symbol|null|undefined. Enter the new object type.With object type, APIs like Object.create can be better represented.
TypeScript 没有表示非原始类型的类型，即任何不是
number| 的东西。string|boolean|symbol|null|undefined. 输入新的对象类型。使用对象类型，可以更好地表示 Object.create 等 API。
The type definition for Object.createwas changed to:
的类型定义Object.create更改为：
create(o: object, properties: PropertyDescriptorMap): any;
So the generic type Tin your example is not assignable to objectunless the compiler is told that Textends object.
因此T，object除非编译器被告知Textends ，否则您示例中的泛型类型不可分配给object。
Prior to version 2.2 the compiler would not catch an error like this:
在 2.2 版之前，编译器不会捕获这样的错误：
Object.create(1, {});
Now the compiler will complain:
现在编译器会抱怨：
Argument of type '1' is not assignable to parameter of type 'object'.
“1”类型的参数不能分配给“对象”类型的参数。
