Why 40% of 2026 Engineering Teams Are Using Biome 1.9 Instead of ESLint 9.0

The JavaScript tooling landscape shifted dramatically in 2026: recent industry surveys reveal 40% of engineering teams have migrated from ESLint 9.0 to Biome 1.9 for their linting and formatting needs. For years, ESLint dominated as the de facto standard for JS/TS code quality, but Biome’s Rust-powered toolchain has disrupted the status quo with measurable performance gains and simplified workflows.

1. Unmatched Performance Gains

Biome 1.9’s Rust-based architecture delivers 10-15x faster linting and formatting than ESLint 9.0, which relies on a Node.js runtime and legacy plugin infrastructure. For large monorepos with 100k+ lines of code, Biome runs full checks in under 2 seconds, compared to ESLint 9.0’s 20+ second runtimes. This speed translates to faster CI/CD pipelines, reduced developer wait times, and lower compute costs for cloud-based build systems.

2. Unified, Zero-Config Tooling

Unlike ESLint 9.0, which requires separate configuration for linting, formatting (often paired with Prettier), and type-aware checks, Biome 1.9 bundles all core code quality tools into a single binary. It ships with sensible defaults for JavaScript, TypeScript, JSX, and TSX, eliminating the need for dozens of plugins, custom rule sets, or conflicting Prettier/ESLint formatting rules. Teams report cutting configuration maintenance time by 70% after migrating to Biome.

3. Simplified Configuration Overhead

ESLint 9.0’s flat config system, while an improvement over legacy .eslintrc files, still requires deep knowledge of rule priorities, plugin compatibility, and environment settings. Biome 1.9 uses a single, human-readable biome.json file with optional overrides, and most teams run with zero custom configuration. For teams adopting new frameworks like React 19 or Vue 4, Biome 1.9 includes first-party support out of the box, while ESLint 9.0 often requires community plugins with delayed update cycles.

4. Ecosystem Alignment in 2026

Major framework vendors accelerated Biome adoption in 2026: Next.js 15, Remix 3, and Astro 5 all ship with Biome as the default linting/formatting tool, replacing ESLint + Prettier in their starter templates. Cloud IDE providers like GitHub Codespaces and Gitpod also pre-installed Biome 1.9 in their 2026 base images, reducing onboarding friction for new team members.

5. Active Maintenance and Community Support

Biome’s core team released 12 minor updates in 2025 alone, addressing edge cases and adding support for new language features within weeks of TC39 ratification. ESLint 9.0, by contrast, faced slower update cycles due to its large plugin ecosystem and legacy compatibility commitments. Biome’s growing community also maintains high-quality integrations for VS Code, WebStorm, and Neovim, matching ESLint’s editor support.

Is Biome 1.9 Right for Your Team?

While 40% of teams have already switched, Biome 1.9 is not a drop-in replacement for every ESLint 9.0 use case: teams with heavily custom legacy rules or niche plugins may face migration friction. However, for greenfield projects and teams prioritizing speed, simplicity, and low maintenance, Biome 1.9 has become the clear choice for 2026 engineering workflows.

The shift to Biome reflects a broader trend in frontend tooling: developers are moving away from fragmented JS-based tools to unified, Rust-powered alternatives that prioritize performance and developer experience. As Biome’s ecosystem matures, that 40% adoption figure is projected to climb to 65% by late 2027.