How do I insert a new line at the end of every item in a collection?

[ben519]

I'm using yaml to display a collection of blog posts with some metadata. For example,

const postsJSON = [
    { id: "lMFm9Yu0RO8gxhZUQNu0", title: "This is my first post", posts: [] },
    { id: "m9Yu0RO8gxhZUQNu0lMF", title: "This is my second post", posts: [] },
    {
      id: "0RO8gxlMFm9YuhZUQNu0",
      title: "This is my third post",
      posts: [
        {
          id: "uhZUQNu00RO8gxlMFm9Y",
          title: "This is a nested post",
          posts: [],
        },
      ],
    },
  ]

const doc = new YAML.Document(postsJSON)
const yamlSTRING = doc.toString()

// console.log(yamlSTRING)
//
// - id: lMFm9Yu0RO8gxhZUQNu0
//   title: This is my first post
//   posts: []
// - id: m9Yu0RO8gxhZUQNu0lMF
//   title: This is my second post
//   posts: []
// - id: 0RO8gxlMFm9YuhZUQNu0
//   title: This is my third post
//   posts:
//     - id: uhZUQNu00RO8gxlMFm9Y
//       title: This is a nested post
//       posts: []

To make this a bit easier to read, I would like to stringify the JSON to include a newline inbetween root-level posts. In other words, I'd like to stringify the above as this

// console.log(yamlSTRING)
//
// - id: lMFm9Yu0RO8gxhZUQNu0
//   title: This is my first post
//   posts: []
// 
// - id: m9Yu0RO8gxhZUQNu0lMF
//   title: This is my second post
//   posts: []
// 
// - id: 0RO8gxlMFm9YuhZUQNu0
//   title: This is my third post
//   posts:
//     - id: uhZUQNu00RO8gxlMFm9Y
//       title: This is a nested post
//       posts: []

I think the right approach is to use a visitor. Something like

  YAML.visit(doc, {
    Seq(_, val) {
      console.log(val)
      // Insert a newline at the end of the sequence
      const newline = doc.createNode("\n")
      val.add(newline)
    },
  })

but this fails for obvious reasons.

Any help here would be greatly appreciated!

[eemeli]

Look for spaceBefore in the docs: https://eemeli.org/yaml

[ben519]

Super helpful. Thanks!