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https://github.com/swc-project/swc-node

Faster ts-node without typecheck
https://github.com/swc-project/swc-node

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Faster ts-node without typecheck

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# `swc-node`



> 🚀 Help me to become a full-time open-source developer by [sponsoring me on Github](https://github.com/sponsors/Brooooooklyn)



**_Fast `TypeScript/JavaScript` transformer without `node-gyp` and postinstall script_**.





  Build Status

  Downloads

  License




## Usage



Run TypeScript with node, without compilation or typechecking:



```bash

npm i -D @swc-node/register

node -r @swc-node/register script.ts

node --import @swc-node/register/esm-register script.ts # for esm project with node>=20.6

node --loader @swc-node/register/esm script.ts # for esm project with node<=20.5, deprecated

```



Pass `--enable-source-maps` to node for esm projects



Set environment variable SWCRC=true when you would like to load .swcrc file



```bash

SWCRC=true node -r @swc-node/register script.ts

```



```typescript

#!/usr/bin/env node --import swc-register-esm



// your code

```



run with shebang, add `TS_NODE_PROJECT=null`(`#!/usr/bin/env TS_NODE_PROJECT=null node --import swc-register-esm`) to use ignore tsconfig.json



## @swc-node/core



Fastest `TypeScript` transformer.



Detail: [@swc-node/core](./packages/core)



### Benchmark



> transform RxJS `AjaxObservable.ts` to ES2015 & CommonJS `JavaScript`. Benchmark code: [bench](./bench/index.ts)



**Hardware info**:



```

Model Name: MacBook Pro

Model Identifier: MacBookPro15,1

Processor Name: 6-Core Intel Core i7

Processor Speed: 2.6 GHz

Number of Processors: 1

Total Number of Cores: 6

L2 Cache (per Core): 256 KB

L3 Cache: 12 MB

Hyper-Threading Technology: Enabled

Memory: 16 GB

```



#### `transformSync`



```bash

esbuild x 510 ops/sec ±1.28% (88 runs sampled)

@swc-node/core x 438 ops/sec ±1.00% (88 runs sampled)

typescript x 28.83 ops/sec ±10.20% (52 runs sampled)

babel x 24.21 ops/sec ±10.66% (46 runs sampled)

Transform rxjs/AjaxObservable.ts benchmark bench suite: Fastest is esbuild

```



#### `transform` parallel



`UV_THREADPOOL_SIZE=11 yarn bench`



```bash

@swc-node/core x 1,253 ops/sec ±0.90% (75 runs sampled)

esbuild x 914 ops/sec ±1.31% (77 runs sampled)

Transform rxjs/AjaxObservable.ts parallel benchmark bench suite: Fastest is @swc-node/core

```



`yarn bench`



```bash

@swc-node/core x 1,123 ops/sec ±0.95% (77 runs sampled)

esbuild x 847 ops/sec ±3.74% (71 runs sampled)

Transform rxjs/AjaxObservable.ts parallel benchmark bench suite: Fastest is @swc-node/core

```



## @swc-node/jest



Fastest jest `TypeScript` transformer.



Detail: [@swc-node/jest](./packages/jest)



### Performance glance



> Testing in pure `TypeScript` project, compile target is `ES2018`.

> Running with `npx jest --no-cache`, `ts-jest` was configured with `isolatedModules: true`



#### ts-jest



```

Test Suites: 49 passed, 49 total

Tests:       254 passed, 254 total

Snapshots:   53 passed, 53 total

Time:        54.631 s

Ran all test suites.

✨  Done in 62.71s.

```



#### @swc-node/jest



```

Test Suites: 49 passed, 49 total

Tests:       254 passed, 254 total

Snapshots:   53 passed, 53 total

Time:        10.511 s

Ran all test suites.

✨  Done in 14.34s.

```



## @swc-node/register



Faster `ts-node/register/transpile-only` alternative.



Detail: [@swc-node/register](./packages/register)



## Development



### Install dependencies



- `pnpm i`



### Build and Test



- `pnpm build`



- `pnpm test`



## Sponsors





  sponsors