Install


``bash
npm install @wasm-fmt/ruff_fmt
`

![jsr.io](https://jsr.io/@fmt/ruff-fmt)

`bash
npx jsr add @fmt/ruff-fmt
`

Usage

Node.js / Deno / Bun / Bundler

`javascript
import { format } from "@wasm-fmt/ruff_fmt";

const input = x = { 'a':37,'b':42,

'c':927}

y = 'hello ''world'
z = 'hello '+'world'
a = 'hello {}'.format('world')
class foo ( object ):
def f (self ):
return 37*-+2
def g(self, x,y=42):
return y
def f ( a ) :
return 37+-+a[42-x : y**3];

const formatted = format(input, "main.py", {
indent_style: "space",
indent_width: 4,
line_width: 88,
quote_style: "double",
magic_trailing_comma: "respect",
});
console.log(formatted);
`

Web

For web environments, you need to initialize WASM module manually:

`javascript
import init, { format } from "@wasm-fmt/ruff_fmt/web";

await init();

const input = x = { 'a':37,'b':42,

'c':927};

const formatted = format(input, "main.py");
console.log(formatted);
`

$3

`JavaScript
import init, { format } from "@wasm-fmt/ruff_fmt/vite";

await init();
// ...
`

Add "@wasm-fmt/ruff_fmt" to optimizeDeps.exclude in your vite config:

`JSON
{
"optimizeDeps": {
"exclude": ["@wasm-fmt/ruff_fmt"]
}
}
`

Entry Points

- . - Auto-detects environment (Node.js uses node, Webpack uses bundler, default is ESM)
- ./node - Node.js environment (no init required)
- ./esm - ESM environments like Deno (no init required)
- ./bundler - Bundlers like Webpack (no init required)
- ./web - Web browsers (requires manual init)
- ./vite` - Vite bundler (requires manual init)

dprint plugin

> [!NOTE]
> dpint plugin is deprecated, please use https://dprint.dev/plugins/ruff instead.

How does it work?

[Ruff] is an extremely fast Python linter, written in Rust.

This package is a WebAssembly build of Ruff formatter, with a JavaScript wrapper.

[Ruff]: https://github.com/astral-sh/ruff