Function newlyRevealed

newlyRevealed(
explored: ReadonlySet<number>,
alreadyDrawn: ReadonlySet<number>,
): number[]
the cell indices in explored not yet baked into a minimap's texture - pure, so it can be tested without a renderer
Parameters
- explored: ReadonlySet<number>
- alreadyDrawn: ReadonlySet<number>
Returns number[]
Example
```
import { newlyRevealed } from '@datamoc/mw_games/two-d/render';

const explored = new Set([4, 9, 12]);
const alreadyDrawn = new Set([4]);

console.log(newlyRevealed(explored, alreadyDrawn)); // [9, 12]
```
- Defined in src/two-d/render/Minimap.ts:18