swc-loader

library0.2.7jsnpmunverified

Webpack loader for the SWC compiler (Rust-based transpiler for JS/TS). Current stable version 0.2.7. Released as part of the swc project (monorepo under @swc). Key differentiators: integrates SWC into Webpack build pipeline for fast transpilation; supports both JavaScript and TypeScript via swc configuration; can be run synchronously or asynchronously. Alternatives include babel-loader, ts-loader.

devops

npm install swc-loader

github ↗package ↗homepage ↗

INSTALL

IMPORT

SIG · SWC-LOADER

swc-loader

devopsjavascriptv0.2.7

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

swc-loader

✓ use: { loader: 'swc-loader' } in webpack config

✗ import swcLoader from 'swc-loader'

This is a webpack loader, not a programmatic API. Use it in webpack module.rules, not as an import.

Basic webpack configuration to transpile JavaScript files using swc-loader

// webpack.config.js module.exports = { module: { rules: [ { test: /\.m?js$/, exclude: /node_modules/, use: { loader: 'swc-loader', options: { sync: true, jsc: { parser: { syntax: 'ecmascript', jsx: false }, target: 'es2020' } } } } ] } }; // package.json side: ensure @swc/core and webpack are installed // npm install --save-dev @swc/core swc-loader webpack

Debug

Known issues

gotchaError messages may be truncated. Use sync: true for full error output.

fix

Add sync: true to loader options.

affects: >=0.1.0

breakingswc-loader requires @swc/core ^1.2.147. Incompatible with older versions.

fix

Upgrade @swc/core to ^1.2.147.

affects: >=0.2.0

deprecatedOptions passed directly to loader are forwarded to swc. Some options changed between swc versions.

fix

Refer to swc.rs/docs/configuring-swc for valid options.

affects: >=0.2.0

gotchaThe loader expects .swcrc config file by default. Inline options merge with .swcrc.

fix

Either provide .swcrc or pass all config via loader options.

affects: >=0.1.0

gotchaTypeScript support requires explicit parser syntax: 'typescript' in jsc.parser.

fix

Add jsc: { parser: { syntax: 'typescript' } } to loader options.

affects: >=0.1.0

Errors

Common errors & fixes

Module not found: Error: Can't resolve '@swc/core'

@swc/core not installed

fix

npm install --save-dev @swc/core

Error: swc-loader is not compatible with webpack < 2

Webpack version too low

fix

Upgrade webpack to >=2

Error: swc-loader requires sync: true for full error stack

Async mode may hide error details

fix

Set sync: true in loader options

Upgrade

Version history

0.2.7latest on npm

Audit

Dependencies

@swc/corerequiredPeer dependency: core SWC compiler

webpackrequiredPeer dependency: webpack loader interface

Agent activity

4 hits · last 30 days

node

Resources

githubhttps://github.com/swc-project/pkgs ↗

packagehttps://www.npmjs.com/package/swc-loader ↗

homepagehttps://swc.rs ↗