What is this strange error: Tuple type element list cannot be empty

Question

Environment: SP2019 onprem

SPFx version: 1.4.1

All of sudden below error is coming while doing gulp build or gulp serve.

A tuple type element list cannot be empty.Error - typescript - src/webparts/displayStateInformation/components/DisplayStateInformation.tsx(14,4): error TS1122: A tuple type element list cannot be empty.

How to resolve this?

Below is my interface

export interface IItemsData {
  k:[];
}

Error throwing for property k

Answer 1

If you are storing it as an array of string then try using below code:

export interface IItemsData {
   k: string[];
}