-type option() ::
          {spawn_above, non_neg_integer() | infinity} |
          {parallel, false | auto | pos_integer()} |
          {extensions, [autolink | tagfilter]}.

Conversion options:

{spawn_above, Bytes | infinity}

Inputs larger than Bytes are converted in a short-lived helper process with a pre-sized heap, which avoids most garbage collection. infinity always converts in the calling process. Default: 256.

{parallel, false | auto | N}

Split large documents at top-level block boundaries and convert the pieces on N schedulers (auto is all online ones). The output is identical to sequential conversion. Documents under 16 KB are never split. Default: false.

{extensions, [autolink | tagfilter]}

Opt-in GFM extensions. autolink turns bare www., http(s):// and ftp:// URLs and e-mail addresses into links. tagfilter escapes <script>, <style> and similar tags. Conversion with extensions is always sequential. Default: none.