src/vs/workbench/api/common/extHostWebviewPanels.ts/ExtHostWebviewPanels/constructor
class ExtHostWebviewPanels:	constructor(
		mainContext: extHostProtocol.IMainContext,
		private readonly webviews: ExtHostWebviews,
		private readonly workspace: IExtHostWorkspace | undefined,
	) {
		this._proxy = mainContext.getProxy(extHostProtocol.MainContext.MainThreadWebviewPanels);
	}