ESLint vs Biome
A comparison of ESLint, the long-established, deeply extensible JavaScript/TypeScript linter, and Biome, the Rust-powered tool that combines linting and formatting into a single fast binary.
Quick Answer
ESLint remains the safest default for mature codebases needing deep plugin coverage, framework-specific rules, and full type-aware linting via typescript-eslint; Biome replaces both ESLint and Prettier with a single, dramatically faster Rust binary and has closed much of the type-aware linting gap with its own inference engine, making it the practical choice for new projects wanting one fast, unified tool.
Reviewed by TechLogHub Engineering Team. Last updated September 29, 2026. Updated for Biome v2's custom type inference engine (reducing but not eliminating its type-aware linting gap with typescript-eslint) as of 2026.
| Feature |  ESLint |  Biome |
|---|---|---|
| Core Purpose | Linting only (formatter separate) | Linting and formatting combined |
| Performance Profile | Slowest of the compared tools, especially type-aware | 50-100x faster AST parsing/traversal than JS-based tools |
| Type-Aware Linting | Full, via typescript-eslint (runs actual TS compiler) | Custom inference engine, ~75% floating-promise parity with typescript-eslint |
| Plugin/Rule Ecosystem | Largest of any JS/TS linter | Smaller, growing, built-in rule set |
| Runtime | Node.js (JavaScript) | Rust (compiled native binary) |
| Maturity Level | Very mature, industry standard for over a decade | Newer, rapidly maturing since Rome fork |
ESLint
The long-established, highly extensible JavaScript and TypeScript linter, with the largest plugin ecosystem of any linting tool, including full type-aware linting via typescript-eslint.
Pros
- Unmatched plugin ecosystem covering virtually every framework, library, and custom rule need imaginable
- typescript-eslint remains the gold standard for full, accurate type-aware linting, running the actual TypeScript compiler for complete type system behavior
- Deepest customization — writing custom rules and configuring highly specific behavior is well-documented and widely practiced
- Longest production track record of any JavaScript linter, battle-tested across countless codebases
- Remains the safest default for mature React, Next.js, test-heavy, or security-sensitive codebases needing comprehensive plugin coverage
Cons
- Meaningfully slower than Rust-based alternatives — type-aware linting on large projects can add 30-60 seconds to CI given the need to run the actual TypeScript compiler
- Doesn't include a formatter — Prettier or another tool is needed separately for code formatting
- Configuration complexity has grown over the years, particularly navigating the newer flat config format alongside legacy configurations
- Can suffer from memory issues (OOMs) on very large monorepos in resource-constrained CI environments
Best For
Mature codebases needing comprehensive framework-specific plugin coverage, teams requiring the most accurate possible type-aware linting, and projects with custom linting rules or highly specific configuration needs.
Biome
A Rust-powered tool that combines linting and formatting into a single fast binary for JavaScript, TypeScript, JSON, and CSS, forked from Meta's abandoned Rome project and now maintained by an independent open-source community.
Pros
- Replaces both ESLint and Prettier with a single tool, one config, and one install — genuinely simplifying the toolchain
- Dramatically faster than ESLint — Rust-compiled native binaries parse and traverse ASTs 50-100x faster than JavaScript-based equivalents
- Biome v2's custom type inference engine catches many type-aware issues (roughly 75% of floating promises typescript-eslint catches, per Biome's own testing) without needing the full TypeScript compiler
- Zero-config drop-in replacement experience for most common ESLint + Prettier setups
- Actively and aggressively developed, with rapid feature additions closing gaps with ESLint over time
Cons
- Type-aware linting coverage, while improving, isn't yet at full parity with typescript-eslint's compiler-backed accuracy
- Smaller plugin/rule ecosystem than ESLint's, meaning some framework-specific or custom linting needs may not have direct equivalents
- Newer overall track record than ESLint's decade-plus of production hardening across every kind of codebase
- Migrating a codebase with heavy custom ESLint configuration or specific plugins can require real evaluation of rule coverage gaps first
Best For
New projects wanting one fast, unified tool for both linting and formatting, and teams whose linting needs are well covered by Biome's built-in rule set without requiring deep ESLint-specific plugin coverage.
One Tool vs Best-of-Breed Composition
Biome's core value proposition is consolidation: where a typical modern JavaScript/TypeScript project historically ran ESLint, Prettier, and possibly separate import-sorting tooling as three separate pieces with three separate configs, Biome replaces all of that with one binary, one config file, and one install. This genuinely simplifies the toolchain for teams whose needs fit within Biome's built-in rule set, at the cost of losing the ability to mix and match best-of-breed tools for each specific concern.
The Type-Aware Linting Gap Is Narrowing But Real
Full type-aware linting — catching bugs that require understanding a value's actual type, like a forgotten `await` on a promise — has historically been ESLint's clearest advantage via typescript-eslint, which runs the actual TypeScript compiler to answer these questions with complete accuracy. Biome v2 introduced its own custom type inference engine that avoids the overhead of running the full TypeScript compiler, catching a meaningful majority of these issues (roughly 75% of floating promises, per Biome's own testing) without that overhead, though it's not yet at full parity with typescript-eslint's compiler-backed accuracy.
Real-World Performance Differences Are Substantial
The performance gap between these tools isn't marginal — independent benchmarks and production reports show ESLint with type-aware rules taking 45-90 seconds on a 100k-line-of-code monorepo, sometimes causing out-of-memory errors on resource-constrained CI machines, compared to Biome completing similar work in a fraction of that time given its Rust-compiled native binary and elimination of Node.js runtime overhead. For large monorepos or CI pipelines where linting time is a genuine bottleneck, this difference compounds meaningfully across many runs per day.
A Reasonable Middle Ground: Oxlint Alongside Either Tool
Some teams adopt a layered approach rather than choosing purely between ESLint and Biome: using Oxlint (part of the same Rust-based Oxc toolchain ecosystem) as a very fast pre-check that catches the majority of common mistakes in milliseconds, then running the fuller ESLint or Biome setup for anything Oxlint's narrower rule set doesn't cover — see our dedicated Oxlint vs Biome comparison for more on this specific combination.
Verdict
Choose Biome for new projects wanting one fast, unified tool that replaces both ESLint and Prettier — its speed advantage and growing rule coverage make it the practical default for teams not needing highly specialized plugin coverage. Stick with ESLint (paired with typescript-eslint) for mature codebases needing comprehensive framework-specific plugins, custom rules, or the most accurate possible type-aware linting, where its unmatched ecosystem and compiler-backed accuracy remain the safer choice despite the speed trade-off.