sindresorhus/eslint-plugin-unicorn

Rule proposal: Extend `prefer-modern-dom-apis` with `insertBefore` => `prepend`

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#1,715 opened on Feb 4, 2022

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help wantednew rule

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Description

Description

Any usage of element.insertBefore(child, element.firstChild) can be converted to element.prepend(child).

(Note, this isn't safe with element.firstChildElement)

Fail

element.insertBefore(child, element.firstChild);

Pass

element.prepend(child)

Contributor guide

Research direction
Study the existing rule `prefer modern dom apis` to understand its structure. Then implement a new rule that detects `insertBefore(child, element.firstChild)` and suggests `prepend(child)`. Use ESLint's AST node types like CallExpression, MemberExpression, Identifier.
Tech stack
javascript
Domain
tooling
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
ESLintJavaScriptAST
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75