Erroneous output with upcoming Records syntax

Description

Records are a new primitives in Javascript, and they are currently being implemented in Firefox (See https://bugzilla.mozilla.org/show_bug.cgi?id=1658309, https://bugzilla.mozilla.org/show_bug.cgi?id=1774360 and https://github.com/tc39/proposal-record-tuple)

Records are instantiated like objects, but with a hash before the curly bracket, e.g. #{ hello: "world" }

Input

The code looked like this before beautification:

#{ hello: "world" }

Expected Output

The code should have looked like this after beautification:

#{ 
  hello: "world"
}

Actual Output

The code actually looked like this after beautification:

# { 
  hello: "world"
}

Notice the space between # and {. If the output would be evaluated, it would result in a SyntaxError

Steps to Reproduce

Environment

OS: OSX

Settings

Default settings, I ran echo "#{hello: 'world'}" | npx js-beautify

---

Let me know if I can be of any help

[antoniusanggito]

I’m creating a new pull request continuing from the previous PR by @cwthedev because I have no permission to push into his actual branch. You can close his previous PR @bitwiseman, I’m sure to finish my PR in several days. ^^

[antoniusanggito]

Yes, I’m working on it