oxc-browserslist

Rust port of Browserslist, forked from browserslist-rs.

The original crate did not meet the criteria of oxc, the following changes are made:

• reduced compilation speed from one minute to a few seconds
• improved some runtime performance, e.g. improve sort method, precompute versions
• removed all unnecessary, heavy or slow dependencies: nom, time, ahash, chrono, either, indexmap, itertools, once_cell, string_cache, serde_json
• reduced binary size through data compression and removal of config file support. 717K (this crate) vs 3.2M (original crate).

Usage

See docs.rs/oxc-browserslist.

Limitation

The following features are not supported, to align with Vite:

• Config file loading (.browserslistrc, package.json browserslist field)
• Environment variables (BROWSERSLIST, BROWSERSLIST_CONFIG, BROWSERSLIST_ENV)
• extends query (e.g. extends browserslist-config-google)
• Custom usage (> 0.5% in my stats or cover 99.5% in my stats)

Example

Inspect query result by running the example:

cargo run --example inspect -- <query>

You can also specify additional options, for example:

cargo run --example inspect -- --mobile-to-desktop 'last 2 versions, not dead'

Testing

Unit and Integration Tests

cargo test

Property-Based Testing

Property-based tests generate random queries and compare results with the npm browserslist CLI.

# Install npm browserslist first
pnpm install

# Run property-based tests
cargo test --test proptest

Fuzzing

Fuzzing tests use libFuzzer to find edge cases.

# Install cargo-fuzz
cargo install cargo-fuzz

# Run the fuzzer
cd fuzz
cargo +nightly fuzz run fuzz_resolve

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