Function unifyLayers

unifyLayers<T extends object>(
layers: readonly T[],
opts?: UnifyLayersOptions,
): UnifiedLayer & Partial<T>
Drive a set of layers as one.
Type Parameters
- T extends object
Parameters
- layers: readonly T[]
  The members. They must already be added to the map; this does not add them.
- opts: UnifyLayersOptions = {}
  See UnifyLayersOptions. Pass map + budgetBytes to enable the governor.
Returns UnifiedLayer & Partial<T>
A UnifiedLayer that also carries every method the members share, so it can be handed straight to LayerSettingsWidget (or nested inside another unifyLayers).
Example
```
const campus = unifyLayers(areas, { map, label: 'Campus', budgetBytes: 1.5e9 });
map.addControl(new LayerSettingsWidget({ layer: campus }), 'top-right');
map.addControl(new MeasurementWidget({ pickLayers: [campus] }), 'top-right');
```