How to craete a interface in typescript for an array such that every odd memmber is a number and every even member is a string. I need some interface

How to craete a interface in typescript for an array such that every odd memmber is a number and every even member is a string. I know tuple like [number,string] but it limits the number of element in array . Also using union(|) will result into anyone can be number or string (number|string)[]. I need something that work for [1,'aa',2,'bb']. I need a interface that can work with [1,'ajay',2,'abcd',3,'defg'] with any number of items in array.