typescript - typescript 中具有联合类型键的松散类型对象

Question

我正在尝试使用联合类型键创建松散类型对象的接口(interface)。

export type ObjectsType = 'text' | 'image' | 'circleText';

export interface IAllowedObjects {
    [key: ObjectsType] : boolean;
}

但得到

An index signature parameter type cannot be a union type. Consider using a mapped object type instead

已经尝试了一些解决方案，但没有运气。

试过This解决方案

    export type ObjectsType = 'text' | 'image' | 'circleText';
    export interface IAllowedObjects {
         [key in ObjectsType] : boolean;
    }

A computed property name in an interface must refer to an expression whose type is a literal type or a 'unique symbol'

A computed property name must be of type 'string', 'number', 'symbol', or 'any'.

Answer 1

您可以定义一个 mapped type仅与 type aliases ，接口(interface)无法做到这一点。

export type ObjectsType = 'text' | 'image' | 'circleText';
export type IAllowedObjects =  {
  [key in ObjectsType]: boolean;
}

Code sample