Options for the plugin.
optional
localDomain: (bareHandle: string,env: any,) => string | null
A function to determine the domain of a bare handle. If it returns null,
the bare handle will be rendered as plain text. null by default.
A function to render a link href for a mention. If it returns null,
the mention will be rendered as plain text. acct:${handle} by default.
optional
linkAttributes: (handle: string,env: any,) => Record<string, string>
A function to render extra attributes for a mention link.
A function to render a label for a mention link. toBareHandle by default.