typescript option for iterator and spread operator-CodePudding

I would like to call the iterator of the type below

type datetimeT = { [key: number]: string };

If a create an object this way

let example: dateTimeT = {1: 'A', 2: 'B'};

The spread operator ...example is not recognized because the type doesn't have [Symbol.iterator]() method

My ts option are

  "target": "es6",
  "module": "esnext",
  "lib": [
    "dom",
    "dom.iterable",
    "esnext",
    "es2017"
  ]

What must I do?

CodePudding user response：

Objects are not automatically iterable in Javascript, it has nothing to do with your TSConfig. Every type that you want to be iterable must implement an iterator method:

type MyIterType = {
  [key: number]: string
} & Iterable<string>

const foo: MyIterType = {
  0: 'a',
  1: 'b',
  *[Symbol.iterator] () {
    const values = Object.values(this)
    while (values.length) {
      yield values.pop()
    }
  }
}

const arr = [...foo] // ['b', 'a']

Playground link