src/vs/workbench/api/common/extHostDebugService.ts/ExtHostDebugServiceBase/getFolder
class ExtHostDebugServiceBase:	private getFolder(_folderUri: UriComponents | undefined): Promise<vscode.WorkspaceFolder | undefined> {
		if (_folderUri) {
			const folderURI = URI.revive(_folderUri);
			return this._workspaceService.resolveWorkspaceFolder(folderURI);
		}
		return Promise.resolve(undefined);
	}