Create strongly typed array of arrays in TypeScript

In a language like C# I can declare a list of lists like:

List> list_of_lists;

Is there a similar way to declare a strongly typed array of arrays in TypeScript? I tried the following approaches but neither compiles.

var list_of_lists:int[][];
var list_of_lists:Array;

int is not a type in TypeScript. You probably want to use number:

var listOfLists : number[][];

Stack Overflow Q#23161486, score: 223