src/vs/workbench/api/common/extHostCustomEditors.ts/ExtHostCustomEditors/constructor
class ExtHostCustomEditors:	constructor(
		mainContext: extHostProtocol.IMainContext,
		private readonly _extHostDocuments: ExtHostDocuments,
		private readonly _extensionStoragePaths: IExtensionStoragePaths | undefined,
		private readonly _extHostWebview: ExtHostWebviews,
		private readonly _extHostWebviewPanels: ExtHostWebviewPanels,
	) {
		this._proxy = mainContext.getProxy(extHostProtocol.MainContext.MainThreadCustomEditors);
	}