Function bindLegend

bindLegend(
    layer: Layer,
    opts?: {
        empty?: string;
        html?: boolean;
        render?: Function;
        root?: Element;
    },
): { destroy: () => void; el: Element; off: () => void; update: () => void }
Mount a legend that keeps itself current.
```
const legend = bindLegend(layer, { root: document.querySelector('#legend') });
layer.set({ palette: 'viridis' });     // the panel repaints itself
```
Parameters
- layer: Layer
- Optionalopts: { empty?: string; html?: boolean; render?: Function; root?: Element } = {}
  render overrides renderLegend — take the Legend, return an HTML string.
Returns { destroy: () => void; el: Element; off: () => void; update: () => void }
- Defined in ui/readModels.js:141