对象中键的索引签名

Question

我有以下打字稿代码

type MapOfErrors = Map<string, Error[]>
interface GatheredErrors {
  'dev': MapOfErrors
  'prod': MapOfErrors
  [key: string]: MapOfErrors
}

const errors: GatheredErrors = {
  dev: new Map<string, Array<Error>>(),
  prod: new Map<string, Array<Error>>()

}

 errors[ctx.env]['something'] = []

其中 ctx 是上下文类型

interface Context {
  token: string
  env: "dev" | "prod"
}

我收到以下错误

src/index.ts:136:5 - error TS7017: Element implicitly has an 'any' type because type 'Map<string, Error[]>' has no index signature.

136     errors[ctx.env]['something'] = []

我不确定如何将索引签名添加到地图类型

Answer 1

Maps don't support the index syntax like you expected they would. They are accessed using methods such as .has(key), .get(key), and .set(key, value):

errors[ctx.env].set('something', [])

对象中键的索引签名

index signature of a key in an object

typescript

index-signature