Problems Importing '@' Classes

I’ve struggled through most of the process of getting a DataFrame-driven panel working (the documentation and examples are pretty poor, but that’s another matter), but I’m having problems with importing items from any of the namespaces starting with ‘@’.

For example…

 import {
  DataFrame,
  DisplayValue,
  Field,
  fieldReducers,
  FieldType,
  GraphSeriesValue,
  KeyValue,
  LinkModel,
  reduceField,
  ReducerID,
  LegacyResponseData,
  getFlotPairs,
  getDisplayProcessor,
  getColorFromHexRgbOrName,
  PanelEvents,
  formattedValueToString,
} from '@grafana/data';

…will result in all of these names (ie. getFlotPairs, which I’d really like access to) being ‘undefined’.

Is there a trick I have to do, something I need to add to my tsconfig.json etc. to help my code find the classes defined in the relative namespaces?