Export HeadingID function to JavaScript

[88250]

@88250 One last thing, How can I get the text of HeadingID at javascript.

Originally posted by @jakekwak in #350 (comment)

[jakekwak]

How about passing the template string in custom rendering and processing it?
I think I don't need the this option. It can not solve the problem. (The Scalability)

[88250]

I am not sure what do you want 😂

[jakekwak]

I am suggesting new custom rendering for scalibilty.
if not, I will modify the lute after learning the Go.

[88250]

Could you give me an example? I think the current design of the renderer extension is good enough.

[Vanessa219]

I think you can provide getId method

renderers: {
        renderHeading: (node, entering) => {
          if (entering) {
            const id = Lute.GetHeadingID(node)
            return [`<h${node.__internal_object__.HeadingLevel} id="${id}" class="vditor__heading">
<a id="vditorAnchor-${id}" class="vditor-anchor" href="#${id}"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>
<span class="prefix"></span><span>`,
              Lute.WalkContinue]
          } else {
            return [`</span></h${node.__internal_object__.HeadingLevel}>`, Lute.WalkContinue]
          }
        },
      }

[jakekwak]

I think that one is good. Thanks.