Invalid prettification of object with unicode escape character as object key

[leumasme]

Description

For the below seen kind of Unicode Literal as Key, js-beautify breaks the code.
The resulting code creates a SyntaxError: Invalid or unexpected token
I also only today learned that the input is valid syntax. It's apparently equivalent to {"𝒶": "ascr"} (note that "𝒶" != "a")

Input

The code looked like this before beautification:

{\u{1d4b6}:"ascr"}

Expected Output

The code should have looked like this after beautification:

{
    \u{1d4b6}: "ascr"
}

or

{
  "\u{1d4b6}": "ascr"
}

or

{
  "𝒶": "ascr"
}

Actual Output

The code actually looked like this after beautification:

{
    \
    u {
        1 d4b6
    }: "ascr"
}

(This is invalid js which fails to execute)

Steps to Reproduce

Simply paste input into js-beautify with default settings (web/npm)

Environment

Tested both in browser via https://beautifier.io/
and using the npm package js-beautify@1.14.8 on Windows 10.

Settings

Example:

{
  "indent_size": "4",
  "indent_char": " ",
  "max_preserve_newlines": "5",
  "preserve_newlines": true,
  "keep_array_indentation": false,
  "break_chained_methods": false,
  "indent_scripts": "normal",
  "brace_style": "collapse",
  "space_before_conditional": true,
  "unescape_strings": false,
  "jslint_happy": false,
  "end_with_newline": false,
  "wrap_line_length": "0",
  "indent_inner_html": false,
  "comma_first": false,
  "e4x": false,
  "indent_empty_lines": false
}

[hilalsidhic]

Hi can someone assign this to me

[bitwiseman]

@hilalsidhic Done.

[Himang02]

Is the issue Open? I want to contribute.

[bitwiseman]

It is open. @hilalsidhic doesn't seem to be working on it. Go ahead.

[Chaitanyaprasad60]

Can you assign me this?

[Bharrguv]

Is this still open ? If yes I am willing to contribute @bitwiseman