This is the documentation of version 0.62.2. Go to the latest version, 1.0.0-rc.5.
TomTom Maps for JavaScript
    Preparing search index...

    Variable styleModuleLayerGroupNamesConst

    styleModuleLayerGroupNames: readonly [
        "pois",
        "trafficFlow",
        "trafficIncidents",
        "hillshade",
    ] = ...

    The layer groups of the style-owned modules other than the base map, each the style layers one module controls: POIsModule, TrafficFlowModule, TrafficIncidentsModule and the hillshade TerrainModule shows.