打字稿定义只能包含特定字符串的数组

Question

我很困惑为什么以下错误，我有字符界面

interface Character {
 race: "ORC" | "ELF" | "HUMAN" | "DWARF"
}

和另一个小酒馆

interface Tavern {
  races: Character['race'][]
}

这里的想法是races是只能是"ORC" | "ELF" | "HUMAN" | "DWARF"

的字符串数组

由于某种原因，当我像这样使用它时出现错误

const tavern: Tavern = {
   races: ["ORC", "ELF", "HUMAN", "DWARF"]
}

错误内容如下

  

[ts]类型'{races：string []}'不能分配给类型'Tavern'。       属性“种族”的类型不兼容。         类型'string []'不能分配给类型'（“ HUMAN” |“ ORC” |“ ELF” |“ DWARF”）[]'。           类型'string'不能分配给类型'“ HUMAN” | “ ORC” | “ ELF” | “ DWARF””。

Answer 1

这是一个古老的打字稿故事，您很可能必须这样做：

const tavern: Tavern = {
   races: ["ORC", "ELF", "HUMAN", "DWARF"] as Array<Character['race']>
}

可能

type Race = "ORC" | "ELF"

const tavern: Tavern = {
   races: ["ORC" as Race, "ELF" as Race]
}

这应该有效

enum Race = { ORC, ELF }

interface Tavern {
  races: Race[]
}

const tavern: Tavern = {
   races: [Race.ORC, Race.ELF]
}