sindresorhus/eslint-plugin-unicorn

Rule proposal: Provide autofix for core rule `no-useless-concat`

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#2,587 opened on Mar 3, 2025

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help wantednew rule

Description

Description

ESLint marked it as frozen, won't accept changes https://github.com/eslint/eslint/issues/19468, let's implement?

Examples

See https://eslint.org/docs/latest/rules/no-useless-concat

Proposed rule name

unicorn/no-useless-concat

Additional Info

No response

Contributor guide

Tech stack
javascriptnodejs
Domain
toolingdeveloper experience
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Understanding of ASTESLint plugin developmentJavaScript
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Review the ESLint docs for no useless concat rule at https://eslint.org/docs/latest/rules/no useless concat. Examine existing rules in the eslint plugin unicorn repository under rules/ to understand structure. Check the issue comments for any additional context. Implement rule with autofix in a new file rules/no useless concat.js and add tests in test/.