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Fix: no-useless-rename invalid autofix with parenthesized identifiers #14032

merged 1 commit into from Jan 30, 2021


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@mdjermanovic mdjermanovic commented Jan 24, 2021

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:

Tell us about your environment

  • ESLint Version: v7.18.0
  • 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:

module.exports = {
  parserOptions: {
    ecmaVersion: 2015

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

Online Demo

/* eslint no-useless-rename: error */

({ a: (a) } = foo );

({ a: (a) = 1 } = foo );

What did you expect to happen?

2 errors, but not an invalid autofix.

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

2 errors and autofix to:

/* eslint no-useless-rename: error */

({ a) } = foo );

({ (a) = 1 } = foo );
  3:5  error  Parsing error: Unexpected token )

{ a) } is obviously a syntax error.

{ (a) = 1 } is also a syntax error, those parentheses are not allowed in shorthand properties.

What changes did you make? (Give an overview)

Changed the no-useless-rename rule to correctly fix code such as { a: (a) } and avoid autofixing code such as { a: (a) = 1 }.

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

This change should be also helpful for future syntax tc39/ecma262#2154, like export { "a b" as "a b" } from "foo";

@mdjermanovic mdjermanovic added bug rule accepted autofix labels Jan 24, 2021
nzakas approved these changes Jan 28, 2021
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@btmills btmills left a comment


@btmills btmills merged commit d76e8f6 into master Jan 30, 2021
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@btmills btmills deleted the nouselessrename-parens branch Jan 30, 2021
* Properties using shorthand syntax and rest elements can not be renamed.
* If the property is computed, we have no idea if a rename is useless or not.
if (property.shorthand || property.type === "RestElement" || property.computed) {
if (property.type !== "Property" || property.shorthand || property.computed) {
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@mdjermanovic mdjermanovic Jan 30, 2021

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I made this change to be consistent with the condition in fix() (where it expects only Property or module specifiers), so checking for ExperimentalRestProperty above became unnecessary.

This was referenced Mar 17, 2021
@eslint-github-bot eslint-github-bot bot locked and limited conversation to collaborators Jul 30, 2021
@eslint-github-bot eslint-github-bot bot added the archived due to age label Jul 30, 2021
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accepted archived due to age autofix bug rule
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3 participants