Typescript object indexer and key that doesn't match indexer type

Question

The Typescript docs show the following example:

interface NumberDictionary {
    [index: string]: number;
    length: number;    // ok, length is a number
           


        

Answer 1

Like this:

interface NumberDictionary {
    [index: string]: number | string;
    length: number;
    name: string;
}