使用 Object.keys 从映射对象输出键/值时出现打字稿错误

Question

I am getting the following Typescript error in a React application when attempting to map over an object of errors and display the key value, and the key as the anchor href.

Element implicitly has an 'any' type because expression of type '"errors"' can't be used to index type '{ paid?: string | undefined; }'.
  Property 'errors' does not exist on type '{ paid?: string | undefined; }'.ts(7053)

Below is the Component

interface ErrorProps {
  errors: {
    paid?: string
  }
}

function Error(props: ErrorProps) {
  return (
    <ul>
      {props.errors && Object.keys(props.errors).map(key => {
        return (
          <li key={key}>
            <a href={`#${key}`}>
              {props.errors[key as keyof ErrorProps.errors]} // The error is on this line
            </a>
          </li> 
        )
      })}
    </ul>
  )
}

The following is the Props passed to the Errors Component:

errors: {paid: "Paid must be a number"}

What I am attempting to get in the resulting HTML is as follows:

<a href="#paid">Paid must be a number</a>

Thanks so much.

Answer 1

ErrorProps.errors is a type , not a namespace . Consider changing the way how you retrieve the nested type.

{props.errors[key as keyof ErrorProps['errors']]}