LatexValue: {
    relax?: boolean;
} & (
    | Dimension
    | Glue
    | {
        string: string;
    }
    | {
        base?:
            | "decimal"
            | "octal"
            | "hexadecimal"
            | "alpha";
        number: number;
    }
    | {
        factor?: number;
        global?: boolean;
        register: string;
    })

A LaTeX expression represent a sequence of tokens that can be evaluated to a value, such as a dimension.