Rule proposal: `prefer-string-repeat`

Description

Array.from({length: 10 + 1}).join('*')

Array.from({length: 10}).fill('*').join('')

Array.from({length: 10}, () => '*').join('')

'*'.repeat(10)

String(foo).repeat(10)

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.

half day

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.

clear

Prerequisites

Understanding of ESLint rulesJavaScript AST knowledge

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

50

Research direction

Review the referenced comment in eslint/eslint#15731 for background. Examine existing rules in eslint plugin unicorn to understand the rule structure. The rule should detect Array.from patterns and suggest using String.prototype.repeat. Look at the test files for similar formatting rules.