Squiz operator-related false positives in JavaScript template literals

[wongjn]

Describe the bug
Getting false errors on JavaScript files within template literals that have operator characters. The false sniffs include:

• Squiz.WhiteSpace.OperatorSpacing.NoSpaceBefore
• Squiz.WhiteSpace.OperatorSpacing.NoSpaceAfter
• Squiz.Formatting.OperatorBracket.MissingBrackets

Code sample

`foo/bar`;
`foo-bar`;
`foo+bar`;
`foo%bar`;

To reproduce
Steps to reproduce the behavior:

1. Create a file called test.js with the code sample above.
2. Run ./vendor/bin/phpcs test.js --standard=Squiz
3. See many incorrect errors displayed

----------------------------------------------------------------------
FOUND 12 ERRORS AFFECTING 4 LINES
----------------------------------------------------------------------
 1 | ERROR | [ ] Missing file doc comment
 1 | ERROR | [x] Operation must be bracketed
 1 | ERROR | [x] Expected 1 space before "/"; 0 found
 1 | ERROR | [x] Expected 1 space after "/"; 0 found
 2 | ERROR | [x] Operation must be bracketed
 2 | ERROR | [x] Expected 1 space before "-"; 0 found
 2 | ERROR | [x] Expected 1 space after "-"; 0 found
 3 | ERROR | [x] Expected 1 space before "+"; 0 found
 3 | ERROR | [x] Expected 1 space after "+"; 0 found
 4 | ERROR | [x] Operation must be bracketed
 4 | ERROR | [x] Expected 1 space before "%"; 0 found
 4 | ERROR | [x] Expected 1 space after "%"; 0 found
----------------------------------------------------------------------
PHPCBF CAN FIX THE 11 MARKED SNIFF VIOLATIONS AUTOMATICALLY
----------------------------------------------------------------------

Expected behavior
No errors from:

• Squiz.WhiteSpace.OperatorSpacing.NoSpaceBefore
• Squiz.WhiteSpace.OperatorSpacing.NoSpaceAfter
• Squiz.Formatting.OperatorBracket.MissingBrackets

Versions:

• OS: Ubuntu 18.04
• PHP: 7.4
• PHPCS: 3.6.1
• Standard: Squiz

[gsherwood]

The ability to sniff JS and CSS files is deprecated. All JS functionality will be removed in version 4 and no bugs will be fixed in version 3. I strongly suggest switching to a dedicated JS linting tool like eslint.

The version 4 roadmap can be found here: https://github.com/squizlabs/PHP_CodeSniffer/milestone/11

The specific issue for this is here: #2448