JavaScript compilers (2026)

Deno

• Deno: Intro

TypeScript

• TypeScript Tutorial

swc

SWC (Speedy Web Compiler) is a high-performance, Rust-based JavaScript and TypeScript compiler designed as a faster alternative to Babel and the native TypeScript compiler (tsc). It is widely integrated into modern developer tools and frameworks, including Next.js, Vite, Parcel, and Deno, to accelerate build times and hot module replacement (HMR).

Key Characteristics:

• Performance: SWC is approximately 20x faster than Babel on a single thread and 70x faster on multi-core systems due to its Rust implementation and parallel processing capabilities.

• Functionality: It handles transpilation (e.g., TypeScript to JavaScript, JSX transformation), minification, and bundling, often replacing separate tools like Terser.
• Configuration: It uses a .swcrc configuration file similar to Babel’s .babelrc but offers a more streamlined setup for modern development workflows.
• Limitations: SWC focuses on fast syntax transformation and does not perform type-checking; developers typically pair it with tsc (for type checking) or use frameworks that handle this separation.

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