Function whenGoogleChartsReady

whenGoogleChartsReady(
    charts: readonly GoogleChart[],
    events: GoogleEvents,
    callback: () => void,
): void
Invokes callback once EVERY given chart has fired its 'ready' event.

Each Google chart fires 'ready' independently, so a multi-panel figure must not be assembled until all panels have rendered. Register the gate before calling chart.draw(…) on any of the charts.
Parameters
- charts: readonly GoogleChart[]
  The chart instances to wait for.
- events: GoogleEvents
  The Google Charts event helper, google.visualization.events.
- callback: () => void
  Invoked once, after every chart has fired 'ready'.
Returns void
Example
```
whenGoogleChartsReady(charts, google.visualization.events, buildMaidr);
charts.forEach((chart, i) => chart.draw(dataTables[i], drawOptions[i]));
```
- Defined in adapters/google-charts/converters.ts:286

src