esbuild + SWC

Fast JS/TS transpilers

FreeLibraries & build toolingesbuild.github.io

What it is

Two native-speed transpilers that made fast JS tooling possible: esbuild (Go) and SWC (Rust). You rarely install either directly — they sit inside test runners, Next.js and older Vite versions. Vite 8 moved to Oxc, so esbuild is no longer in a fresh Vite pipeline.

Why it earns a slot

Worth recognising in error messages and lockfiles rather than choosing. When a stack trace blames esbuild or @swc/core, the bug is in your transpile config, not your React code.

Know before you commit

esbuild is still pre-1.0 and makes breaking changes at minor versions. Neither tool type-checks — they strip types, so you still need tsc in CI.

Field notes

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Pricing snapshot

Free · MIT / Apache-2.0

Snapshots move fast — verify at checkout, and post a field note if it changed.

Drop into your Lovable chat

Evaluate esbuild + SWC (https://esbuild.github.io) for this project, then use it only if it fits what we are already building.
Context: Fast JS/TS transpilers. Two native-speed transpilers that made fast JS tooling possible: esbuild (Go) and SWC (Rust). You rarely install either directly — they sit inside test runners, Next.js and older Vite versions. Vite 8 moved to Oxc, so esbuild is no longer in a fresh Vite pipeline.
Reviewer notes (general, not written for this codebase): Worth recognising in error messages and lockfiles rather than choosing. When a stack trace blames esbuild or @swc/core, the bug is in your transpile config, not your React code.
Watch out for: esbuild is still pre-1.0 and makes breaking changes at minor versions. Neither tool type-checks — they strip types, so you still need tsc in CI.
Pricing: Free · MIT / Apache-2.0
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

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