svelte-check-rs

A high-performance, Rust-powered diagnostic engine designed as a drop-in replacement for svelte-check.

Note: This tool only supports Svelte 5+. For Svelte 4 or earlier, use the official svelte-check.

Features

• 🚀 Fast: 10-100x faster than svelte-check through Rust's zero-cost abstractions and parallel processing
• ✅ Accurate: Full feature parity with svelte-check - same diagnostics, same behavior
• 🔄 Compatible: Drop-in CLI replacement, identical output formats
• 🔧 Maintainable: Clean separation of concerns, comprehensive test suite

Installation

macOS / Linux

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/pheuter/svelte-check-rs/releases/latest/download/svelte-check-rs-installer.sh | sh

Windows (PowerShell)

irm https://github.com/pheuter/svelte-check-rs/releases/latest/download/svelte-check-rs-installer.ps1 | iex

Usage

# Check current directory
svelte-check-rs

# Check specific directory
svelte-check-rs --workspace ./my-project

# Watch mode
svelte-check-rs --watch

# Different output formats
svelte-check-rs --output json
svelte-check-rs --output machine
svelte-check-rs --output human-verbose

CLI Options

Option	Description
--workspace <PATH>	Working directory (default: .)
--output <FORMAT>	Output format: human, human-verbose, json, machine
--tsconfig <PATH>	Path to tsconfig.json
--threshold <LEVEL>	Minimum severity: error, warning
--watch	Watch mode
--preserveWatchOutput	Don't clear screen in watch mode
--fail-on-warnings	Exit with error on warnings
--diagnostic-sources <LIST>	Which diagnostics: js, svelte, css
--ignore <PATTERNS>	Glob patterns to ignore

Project Structure

crates/
├── svelte-parser/        # Lexer + parser + AST types
├── source-map/           # Position tracking and mapping
├── svelte-transformer/   # Svelte → TypeScript transformation
├── svelte-diagnostics/   # A11y, CSS, and component checks
├── tsgo-runner/          # tsgo process management
└── svelte-check-rs/      # CLI binary

Development

# Build all crates
cargo build

# Run tests
cargo test

# Run clippy
cargo clippy --all-targets -- -D warnings

# Format code
cargo fmt

License

MIT License - see LICENSE for details.