Type Alias AttributeType

AttributeType:
    | "boolean"
    | "number"
    | "string"
    | readonly string[]
    | (raw: string) => unknown

How a data-hl-* attribute on a component root is parsed into an option:

'boolean': present (or "true") is true, "false" is false.
'number': parsed with Number(); non-numeric values are ignored.
'string': taken verbatim.
a list of strings: accepted only when the value is one of them.
a function: called with the raw string; return undefined to ignore it.