打字稿对象中的不同数组

Question

I have an object for instance:

const obj = {
  arr1: [100, 30, 10],
  arr2: ['hello', 'hello', 'hello']
}

Typescript can't define type of obj, what type shouled I assign to obj? I tried

const obj: [number,number,number] | [string,string,string]  {}

but it didn't work, TS2322 error, any suggestions?

Answer 1

In the example type annotation obj: [number,number,number] | [string,string,string] obj: [number,number,number] | [string,string,string] typescript cannot see that you meant an object - it thinks you meant obj is either a three-tuple of numbers, or a three-tuple of strings.

I'm guessing you want something more like this:

// inferred type is { arr1: number[], arr2: string[] }
const obj1 = {
  arr1: [100, 30, 10],
  arr2: ['hello', 'hello', 'hello']
}

// no compiler error because obj2 matches obj1
const obj2: { arr1: number[]; arr2: string[]; } = obj1