This is the documentation of version 0.62.3. Go to the latest version, 1.0.0-rc.5.
TomTom Maps for JavaScript
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    Type Alias TerrainKnob

    TerrainKnob: KnobEntry<TerrainKnobId, "toggle" | "number">

    One entry of terrainKnobCatalogue. The value in force is the one at its path in TerrainModule.getConfig, else its default; with neither, the map's own terrain decides.