Strong element containing a single newline is not parsed correctly

[emmerich]

Subject of the issue

A strong tag containing a single newline character is not correctly parsed.

Your environment

• OS: Catalina 10.15.5
• Packages: remark-parse 8.0.2
• Env: node v10.16.0

Steps to reproduce

Newline Example:

**
**

Expected behaviour

The AST should be parsed with an empty strong block.

Actual behaviour

The asterisks are interpreted as text themselves:

{
  "type": "root",
  "children": [
    {
      "type": "paragraph",
      "children": [
        {
          "type": "text",
          "value": "**\n**"
        }
      ]
    }
  ]
}

[wooorm]

Although some of our strong and emphasis parsing is broken, this is in fact expected behavior per CommonMark

[wooorm]

I don‘t get strong emphasis here either:

**
**

(GFM is now based on CM)

[emmerich]

I don‘t get strong emphasis here either:

**
**

(GFM is now based on CM)

(yes, apologies, deleted my comment after doing a bit more testing - seems it only works in some editors but it's not a standard)

[wooorm]

Fwiw, GFM is based on CM for the last two years. Some markdown parsers (like remark) are in a transitional phase. #439