Fix: curly multi
reports single lexical declarations (fixes #11908)
#12513
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What is the purpose of this pull request? (put an "X" next to item)
[X] Bug fix #11908
Tell us about your environment
What parser (default, Babel-ESLint, etc.) are you using?
default
Please show your full configuration:
Configuration
What did you do? Please include the actual source code causing the issue.
Online Demo Link
What did you expect to happen?
0 errors. A block with only one statement which is a lexical declaration doesn't make much sense, but still these curly braces cannot be removed.
What actually happened? Please include the actual, raw output from ESLint.
1 error and syntax error in the fixed code.
What changes did you make? (Give an overview)
Changed the
multi
option to not report single-statement blocks if that statement is alet
,const
,function
orclass
declaration.Is there anything you'd like reviewers to focus on?
The following added
valid
test were invalid, and the autofix was producing syntax errors:The same applies to these
valid
tests with theconsistent
modifier:The following
valid
test was also invalid. This code without braces is not a syntax error in non-strict mode, but it's a legacy syntax, so the original code shouldn't be reported and auto-fixed:This
invalid
test was invalid before, it's a regression test:These two
invalid
tests with theconsistent
modifier wereinvalid
before, but in a different way. Autofix was removing braces, which was producing syntax errors. After this PR, autofix will do the opposite, put the braces around the statement that isn't in a block.That's the only case where this PR can produce more warnings (e.g. 2 instead of 1), but that can happen only in chains that already have warnings.