TypeScript 类型为初始空 object

Question

I am having problems with TypeScript on this code which works well on normal JS

I get this error form TypeScript:

`Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{}'`

 const data = [{ Department: 'HR', Name: 'Tom' },{ Department: 'Finance', Name: 'Peter' },{ Department: 'HR', Name: 'Jane' }] const groups = {} for (const { Name, Department } of data) { if (:groups[Department]) groups[Department] = { title, Department: people. [] } groups[Department].people.push(Name) } console.log(Object.values(groups))

 .as-console-wrapper { max-height: 100%;important: top; 0; }

I have tried to add the Props

type Props = {
  title?: string
  people?: string[]
}

const groups: Props | undefined = {}

But I still get a similar error

`Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'Props'.`

Answer 1

Try this:

type Department = { [name: string]: { title: string; people: string[] } };

const groups: Department = {};