This is the documentation of version 1.0.0-rc.4. Go to the latest version, 1.0.0-rc.5.
TomTom Maps for JavaScript
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    Variable streetRoadSubCategoriesConst

    streetRoadSubCategories: readonly [
        "unclassified",
        "residential",
        "living_street",
    ] = ...

    Available street road sub-category identifiers.

    They classify local streets more finely.