wasm-brotli

wasm-brotli

WebAssembly compiled Brotli library.

Installation

npm install -S wasm-brotli

The awesome thing about wasm-brotli is that it does not need to compile or download any prebuilt binaries!

Usage

Because WebAssembly is supported on both Node.js and several browsers, wasm-brotli is super easy to use.

Node.js

An example of compressing something and saving it to a file via Node.js.

import { compress } from 'wasm-brotli';
import { writeFile } from 'fs';
import { promisify } from 'util';

const writeFileAsync = promisify(writeFile);

const content = Buffer.from('Hello, world!', 'utf8');

(async () => {
  try {
    const compressedContent = await compress(content);
    await writeFileAsync('./hello_world.txt.br', compressedContent);
  } catch (err) {
    console.error(err);
  }
})();

Browser

An example of compressing something and downloading it from the browser.

import { compress } from 'wasm-brotli';

const content = new TextEncoder('utf-8').encode('Hello, world!');

(async () => {
  try {
    const compressedContent = await compress(content);

    const file = new File([compressedContent], 'hello_world.txt.br', { type: 'application/brotli' });

    const link = document.createElement('a');
    link.setAttribute('href', URL.createObjectURL(file));
    link.setAttribute('download', file.name);
    link.click();
  } catch (err) {
    console.error(err);
  }
})();

Documentation

compress(buffer)

• buffer <Uint8Array>

Compress buffer using Brotli compression.

decompress(buffer)

• buffer <Uint8Array>

Decompress buffer using Brotli decompression.

Development

To build wasm-brotli you will need to install wasm-pack. After that all that is needed is to do the following:

1. Install all dependencies.

   npm install
   

2. Build the module.

   npm run build
   

3. Test the module.

   npm test
   

Benchmark

1. Build wasm-brotli if you haven't already done so— see instructions here.

2. Build and run the benchmark.

   npm run benchmark
   

3. Wait a while... The tests might run quite slow.

These results are run on a Dell XPS 13 9360 with an Intel® Core™ i7-7500U CPU @ 2.70GHz × 4 and 16 GB 1866 MHz DDR3 memory, running Ubuntu 19.10:

iltorb (native compress)      1 byte(s)  x 5,159 ops/sec ±9.73% (66 runs sampled)
wasm-brotli (wasm compress)   1 byte(s)  x 49.80 ops/sec ±0.61% (78 runs sampled)
iltorb (native compress)      1024 byte(s)       x 329 ops/sec ±1.63% (81 runs sampled)
wasm-brotli (wasm compress)   1024 byte(s)       x 32.33 ops/sec ±0.77% (76 runs sampled)
iltorb (native compress)      1038336 byte(s)    x 2.23 ops/sec ±1.20% (15 runs sampled)
wasm-brotli (wasm compress)   1038336 byte(s)    x 1.03 ops/sec ±0.93% (10 runs sampled)