H with curly brackets

I saw at lodash.com this install snippet:

$ {sudo -H} npm i -g npm

Why are there curly brackets?

Where is the difference between:

$ sudo -H npm i -g npm

Thanks!

---

UPDATE: have a look at the comments of your question. it is not bash related.

an extract of the bash man page. hope this helps.

{ list; }

         list is simply executed in the current shell environment.   list
         must  be  terminated with a newline or semicolon.  This is known
         as a group command.  The return status is  the  exit  status  of
         list.   Note that unlike the metacharacters ( and ), { and } are
         reserved words and must occur where a reserved word is permitted
         to  be  recognized.   Since they do not cause a word break, they
         must be separated from  list  by  whitespace  or  another  shell
         metacharacter.

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