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

    terrainKnobCatalogue: readonly TerrainKnob[] = ...

    Every terrain knob with its kind, description, range and, where one value holds everywhere, its default. Static data, readable with no map loaded.

    A knob is a plain display value in TerrainModuleConfig, at the path its id names. Not knobs: events.