lux

A Blazing-Fast Compiler for Svelte 5.

Architecture

Pipeline: Parse → Analyze → Transform

• svelte-ast: AST type definitions, ESTree serialization
• svelte-parser: Zero-copy parsing with OXC allocator, winnow-based template/CSS parser, OXC for JS/TS expressions
• svelte-analyzer: Semantic analysis (scope, bindings, validation)
• svelte-transformer: Code generation (JS/CSS output)

Benchmarking

Compare Lux parser/analyzer/transform pipeline against Svelte:

cargo bench -p lux-parser --bench svelte_compare_parser
cargo bench -p lux-analyzer --bench svelte_compare_analyzer
cargo bench -p lux-transformer --bench svelte_compare_transformer

The benchmark uses node in tools/svelte_runner for Svelte runs. Default input is benchmarks/assets/benchmark.svelte. Set LUX_BENCH_INPUT to benchmark a different .svelte file. Reports are written under:

• benchmarks/criterion/lux-parser
• benchmarks/criterion/lux-analyzer
• benchmarks/criterion/lux-transformer

License

MIT