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When do I get this error?
The "Unclosed comment" error is thrown when JSLint or JSHint encounters a
multiline comment that does not end with the character sequence */. Here's
an example:
​x
 
1
/* This is a comment
2
 * but I forgot to
3
 * close it.
4
​
JSLint found 1 error
Which linter should be used for this code snippet:
 JSLint JSHint ESLint
Which version of the linter should be used:
Update
Version 2015-09-23
Line 4:
Unclosed comment.

Why do I get this error?
This error is raised to highlight a fatal JavaScript syntax error. Your code
will not run unless you fix this issue. The ECMAScript 5 specification lists the
following grammar for multiline comments (ES5 §7.4):

MultiLineComment ::

    /* MultiLineCommentCharsopt */

We can see from the above quote that multiline comments must end with the */
characters. If you have an unclosed multiline comment a syntax error will be
thrown when the interpreter reaches the end of the file. Here's the above
snippet once more, except we've closed the comment this time:
4
 
1
/* This is a comment
2
 * but I remembered to
3
 * close it. */
4
​
JSLint found no errors
Which linter should be used for this code snippet:
 JSLint JSHint ESLint
Which version of the linter should be used:
Update
Version 2015-09-23

In JSHint 1.0.0 and above you have the ability to ignore any warning with a
special option syntax. Since this message relates to a fatal
syntax error you cannot disable it.
JSHint bug alert
Fixed as of JSHint 1.0.0. As you may have noticed if you have switched one
of the examples above to use a pre-1.0.0 version of JSHint instead of JSLint, a
large number of the same message appear to get generated for the first unclosed
comment, to the point where the parser gives up and tells you that there are too
many errors.