ESLint + Prettier

Linter + formatter (classic)

FreeLibraries & build toolingeslint.org

What it is

The long-standing pair: ESLint (v10) catches bugs and bad patterns via a huge plugin ecosystem, Prettier (v3) reformats code deterministically. ESLint 10 uses flat eslint.config.js config; the old .eslintrc format is gone.

Why it earns a slot

Still the default in most scaffolds and the only option if you need niche rules like eslint-plugin-jsx-a11y. Without a formatter, AI-generated code arrives in five different styles and every diff is noise.

Know before you commit

Flat config broke most older tutorials and many plugins. If you are starting fresh and need no exotic rules, Biome is far less setup.

Getting started

npm install --save-dev eslint prettier

Field notes

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Pricing snapshot

Free · MIT

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Evaluate ESLint + Prettier (https://eslint.org) for this project, then use it only if it fits what we are already building.
Context: Linter + formatter (classic). The long-standing pair: ESLint (v10) catches bugs and bad patterns via a huge plugin ecosystem, Prettier (v3) reformats code deterministically. ESLint 10 uses flat eslint.config.js config; the old .eslintrc format is gone.
Reviewer notes (general, not written for this codebase): Still the default in most scaffolds and the only option if you need niche rules like eslint-plugin-jsx-a11y. Without a formatter, AI-generated code arrives in five different styles and every diff is noise.
Watch out for: Flat config broke most older tutorials and many plugins. If you are starting fresh and need no exotic rules, Biome is far less setup.
Pricing: Free · MIT
Setup: npm install --save-dev eslint prettier
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

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