SWC vs Babel for CI: Faster JavaScript Transpiling
SWC is a Rust-based, near drop-in Babel replacement that is much faster in CI; Babel keeps the largest plugin ecosystem and broadest compatibility.
Babel is the long-standing JavaScript/TypeScript transpiler with a vast plugin and preset ecosystem. SWC is a Rust-based compiler that performs the same transpiling far faster and is used inside Next.js, Vitest, and other tools.
| SWC | Babel | |
|---|---|---|
| Implementation | Rust | JavaScript |
| Speed | Much faster | Slower |
| Plugin ecosystem | Smaller, growing | Largest |
| Babel compatibility | High (common presets) | n/a |
| Used by | Next.js, Vitest, others | Broad legacy + custom setups |
In CI
SWC dramatically cuts transpile time, which speeds builds and test transforms - a clear win when transpiling is on the critical path. Babel's advantage is its enormous plugin ecosystem: if you depend on niche or custom Babel plugins, SWC may not have equivalents yet. Many frameworks already use SWC by default, so you may be on it without choosing directly.
Migration effort
SWC covers common Babel presets and many plugins, but audit your custom Babel plugins before switching - keep a small Babel config for anything SWC cannot do. Cache dependencies in CI; faster managed runners compound the speed gain.
The verdict
Want the fastest transpile and your plugins are covered: SWC. Depend on a wide or custom Babel plugin set: stay on Babel (or run both). Check plugin coverage before migrating.