@versatiles/map-state
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    Variable BACKGROUND_THEMESConst

    BACKGROUND_THEMES: readonly [
        "colorful",
        "colorful-dark",
        "natural",
        "natural-dark",
        "muted",
        "muted-dark",
        "gray",
        "gray-dark",
        "toner",
        "toner-dark",
        "positrino",
        "positrino-dark",
        "fnord",
        "protocol",
        "protocol-dark",
        "protostar",
        "protostar-dark",
        "protozoa",
        "classic",
        "googol",
        "freedom",
        "macbob",
        "mactaylor",
        "bingo",
    ] = ...

    The themes of the vector map, as @versatiles/style names them. A link stores a theme as its index here, so new ones are added at the end; a theme that is not listed is stored as text.