fix(document): do not break the line of the metadata

[yin1999]

Summary

The content sync tool will finally call the saveFile() function to update the metadata of documents. And it would break the line of the key/value pair in the front-matter. This default behavior conflicts with our front-matter-linter.

see: mdn/translated-content#17266.

Solution

Adding the lineWidth option to resolve this.

---

How did you test this change?

Using the following script to test the option:

import yaml from "js-yaml";

const options = {
  lineWidth: -1,
  quotingType: '"',
}

console.log(yaml.dump({
  // test long line which breaks into two lines in mdn/translated-content#17266
  "slug": "Web/Media/Audio_and_video_delivery/Adding_captions_and_subtitles_to_HTML5_video",
  "browser-compat": [ // test array
    "api.MessageChannel",
    "api.MessagePort"
  ]
}, options))

[argl]

Looks good, thanks!