Building pre-compiled
Node.js addons in Rust

Seamless WebAssembly integration, safer API designs with lifetime management, and simplified cross-compilation for broader platform support.

Live WASM + NAPI-RS Demo

This is a sample app using NAPI-RS WebAssembly. You can transform the image to webp, jpeg or avif with different quality.

Transform Image App

TS Code

import { Transformer } from '@napi-rs/image'
 
export async function transform() {
  const imageResponse = await fetch(
    'https://upload.wikimedia.org/wikipedia/commons/5/5d/ISS-45_EVA-2_%28a%29_Scott_Kelly.jpg'
  )
 
  const imageBytes = await imageResponse.arrayBuffer()
 
  const transformer = new Transformer(imageBytes)
  const webp = await transformer.toWebp()
}

Rust Code

use napi::bindgen_prelude::*;
use napi_derive::napi;
 
#[napi]
pub struct Transformer {
  inner: Uint8Array,
}
 
#[napi]
impl Transformer {
  #[napi(constructor)]
  pub fn new(inner: Uint8Array) -> Self {
    Self { inner }
  }
 
  #[napi]
  pub fn webp(&self) -> Result<Uint8Array> {
    let image = image::load_from_memory(&self.inner)?;
    let webp = image.to_webp().map_err(|e| Error::from(e.to_string()))?;
    Ok(webp.into())
  }
}