我有一个枚举
enum Action {
action1 = 'action1',
action2 = 'action2'
};
我将其值用作对象中的计算属性名称：
/*
...to be able to use these as values, not just types
*/
const ActionState = {
[Action.action1]: 'actionState1' as const,
[Action.action2]: 'actionState2' as const,
};
我想定义一个类型/一个接口，其键是将 an 映射Action到相应的模板文字ActionState：
/*
{
actionState1: boolean;
actionState2: boolean;
}
*/
type ActionModelState {
[key in keyof Action as `${typeof ActionState[key]}`]: boolean // all booleans but I need the keys to be restricted
}
// throwing:
// Type 'key' cannot be used to index type '{ action1: "actionState1"; action2: "actionState2"; }'.
我将用它扩展我的基本类型：
type BaseAction = {
id: number;
foo: string;
bar: string;
};
来形成：
type EnrichedAction = BaseAction & ActionModelState;
最终得到：
const enrichedAction: EnrichedAction = {
id: 123,
foo: 'foo',
bar: 'bar',
actionState1: true,
actionState2: false,
}
ActionModelState当我清楚地知道Actionas的成员时，我该如何定义ActionState？编译器抱怨说：
类型 'key' 不能用于索引类型 '{ action1: "actionState1"; 动作2：“动作状态2”；}'
但我想typeof key === keyof Action。我究竟做错了什么？
你根本不需要keyof Action这里；类型Action已经是这些字符串值的联合。所以你想要key in Action，不是key in keyof Action。
type ActionModelState = {
[key in Action as `${typeof ActionState[key]}`]: boolean
}
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