Is there a way for a renderer to defer to the default behavior?

[rschristian]

My goal is to intercept & manipulate just a small subset of paragraph tags, ideally having the rest be handled automatically so that I don't need to figure out & handle all other types of content that can sit within paragraphs.

I've read the docs and it seems like this isn't possible, but I'd like to double check:

The Renderer : renderer

The renderer defines the HTML output of a given token. If you supply a renderer in the options object passed to marked.use(), any functions in the object will override the default handling of that token type.

https://marked.js.org/using_pro#renderer

For example,

marked.use({
  renderer: {
    paragraph({ text }) {
      if (text.startsWith('...') {
        // Some custom behavior
        return '...';
      }
      // defer to default in some form
    }
  }
});

[calculuschild]

Keep reading to the next paragraph:

Calling marked.use() to override the same function multiple times will give priority to the version that was assigned last. Overriding functions can return false to fall back to the previous override in the sequence, or resume default behavior if all overrides return false.

Just have your custom renderer return false at the point you want it to fall back to default behavior.

If this isn't clear, let us know how we can improve the wording.

[rschristian]

Brilliant, thanks!

Whilst I certainly read that paragraph, that's not the meaning I took away. Not quite sure how else I'd word it, but I understood that to instead mean I could use return false to defer to other user-land implementations/defaults, not marked's default.

Might just be silly evening brain for me though, feel free to ignore. Thanks again, I appreciate the response!

[calculuschild]

What it is trying to say, is you can potentially load multiple custom renderers, and their priority will depend on load order.

If the first one returns FALSE, it will fall back to the next custom renderer. If that also returns FALSE, we continue falling back. If there are no more custom renderers in the stack, we just fall back to the default.