src/vs/workbench/api/common/extHostWebviewPanels.ts/ExtHostWebviewPanel/constructor
class ExtHostWebviewPanel:	constructor(
		handle: extHostProtocol.WebviewHandle,
		proxy: extHostProtocol.MainThreadWebviewPanelsShape,
		webview: ExtHostWebview,
		params: {
			viewType: string;
			title: string;
			viewColumn: vscode.ViewColumn | undefined;
			panelOptions: vscode.WebviewPanelOptions;
			active: boolean;
		}
	) {
		super();
		this.#handle = handle;
		this.#proxy = proxy;
		this.#webview = webview;
		this.#viewType = params.viewType;
		this.#options = params.panelOptions;
		this.#viewColumn = params.viewColumn;
		this.#title = params.title;
		this.#active = params.active;
	}