@illandril/foundryvtt-types/src/systems/dnd5e/dataModels/SystemDataModel.d.ts

Type definitions for the Foundry VTT client, used by Illandril's modules

declare global {
  namespace dnd5e {
    namespace dataModels {
      class SystemDataModel extends foundry.abstract.TypeDataModel {}
    }
  }
}

export type {};