GFM extension: task lists

[wooorm]

In GFM, phrasing, when inside a list item, can render a new construct at its start, namely a checkbox!

This gets interesting, because the phrasing can be preceded by definitions.

I’ll use separate comments because there is a way to turn off checked checkboxes! 🙄

Exhibit A (definitions):

- [y]: a
  [x] foo

• [x] foo

[wooorm]

Exhibit B (setext headings):

- [x] foo
  -------

• [x] foo

Note that checkboxes don’t work in setext headings

[wooorm]

Exhibit C (turning off checkboxes):

- [x] foo

[x]: a

• x foo

^-- look at that! Checked checkboxes no longer work.

[wooorm]

It is interesting to me that there are a couple of things that only work at the start of some construct:

• Frontmatter (extension) only works at the start of a document
• Definitions (CM) only work at the start of content blocks
• Task lists (GFM extension) only work at the start of list item phrasing

So it seems that there should be some hook for extensions to hook into

[wooorm]

https://github.com/micromark/micromark-extension-gfm-task-list-item