Missing undefined return type for CostMatrix#get

[Jomik]

Expected Behavior

Correct typing for CostMatrix#get, it can return undefined.

Actual Behavior

CostMatrix#get returns undefined if input is out of bounds.

Sample code (if available)

const costMatrix = new PathFinder.CostMatrix();
costMatrix.get(-1, 0) == undefined; // true

Your Environment

• Node.js version: 16
• TypeScript version: 4.6.3
• @types/screeps version: 3.3.0