remark-lint-heading-whitespace

This is a remark-lint rule.

On some keyboards, for instance the default Swiss German keyboard layout de_CH QWERTZ layout, the # symbol is obtained using alt-3. Because alt-space inserts a non-breaking space, it seems easy to insert #<non-breaking space> by mistake while writing Markdown heading # title.

This leads to headings getting parsed as normal Markdown paragraphs, here a and c are normal headings, b and d have probably been typed too fast without releasing the alt key between # and space:

This remark-lint rule prevents this from ever happening by throwing an error whenever such situations are detected.

Using the rule

Via .remarkrc

npm install -g remark-cli
npm install remark-lint remark-lint-heading-whitespace

Then, set up your .remarkrc:

{
  "plugins": [
    "lint",
    "lint-heading-whitespace"
  ]
}

Now you can use the following command to run the lint:

remark xxx.md

Via CLI

npm install -g remark-cli
npm install remark-lint remark-lint-heading-whitespace
remark -u lint -u lint-heading-whitespace xxx.md