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Update: fix false negative of no-extra-parens with NewExpression #13930

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merged 1 commit into from Dec 18, 2020

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Prerequisites checklist

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[x] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofixing to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

This bug fix can generate more warnings.

Tell us about your environment

  • ESLint Version: v7.15.0
  • Node Version: v12.18.4
  • npm Version: v6.14.6

What parser (default, @babel/eslint-parser, @typescript-eslint/parser, etc.) are you using?

Please show your full configuration:

Configuration
module.exports = {
  parserOptions: {
    ecmaVersion: 2015
  }
};

What did you do? Please include the actual source code causing the issue.

Online Demo

/* eslint no-extra-parens: error */

new (new A);

What did you expect to happen?

Given that no-extra-parens already reports new (new A())() as in this demo, I would expect an error and autofix to:

/* eslint no-extra-parens: error */

new new A;

What actually happened? Please include the actual, raw output from ESLint.

no errors

What changes did you make? (Give an overview)

Fixed the no-extra-parens rule to not skip NewExpression without parens of arguments when the parent NewExpression also doesn't have those parens.

Is there anything you'd like reviewers to focus on?

@mdjermanovic mdjermanovic added bug ESLint is working incorrectly rule Relates to ESLint's core rules accepted There is consensus among the team that this change meets the criteria for inclusion labels Dec 16, 2020
Comment on lines +484 to +487
!(
node.type === "NewExpression" &&
!isNewExpressionWithParens(node)
)
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This is new, the rest of the diff is refactoring.

Comment on lines +851 to +852
invalid("new (new A);", "new new A;", "NewExpression"),
invalid("new (new a.b);", "new new a.b;", "NewExpression"),
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These two tests are new behavior, others are regression tests.

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@btmills btmills left a comment

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The if condition has too many branches for me to be 100% confident I'm following correctly, so thanks for adding the comments, and I'll rely on the tests to prove the behavior is correct. LGTM

@mdjermanovic mdjermanovic merged commit a62ad6f into master Dec 18, 2020
@mdjermanovic mdjermanovic deleted the noextraparens-newnewcallee branch December 18, 2020 21:33
@eslint-github-bot eslint-github-bot bot locked and limited conversation to collaborators Jun 17, 2021
@eslint-github-bot eslint-github-bot bot added the archived due to age This issue has been archived; please open a new issue for any further discussion label Jun 17, 2021
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2 participants