This is the documentation of version 0.47.9. Go to the latest version, 1.0.0-rc.5.
TomTom Maps for JavaScript
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    Variable BASE_MAP_SOURCE_IDConst

    BASE_MAP_SOURCE_ID: "vectorTiles" = 'vectorTiles'

    Source identifier for base map vector tiles.

    References the primary vector tile source containing roads, buildings, land use, water bodies, and other fundamental map features.