Wasm-zopfli NPM

wasm-zopfli

WebAssembly compiled Zopfli library.

Installation

npm install -S wasm-zopfli

The awesome thing about wasm-zopfli 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-zopfli is super easy to use.

Node.js

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

import { gzip } from 'wasm-zopfli';
import { writeFile } from 'fs';
import { promisify } from 'util';

const writeFileAsync = promisify(writeFile);

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

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

Browser

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

import { gzip } from 'wasm-zopfli';

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

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

    const base64CompressedContent = btoa((
      compressedContent.reduce(
        (string, charCode) => `${string}${String.fromCharCode(charCode)}`,
        '',
      )
    ));

    const link = document.createElement('a');
    link.setAttribute('href', `data:application/gzip;base64,${base64CompressedContent}`);
    link.setAttribute('download', 'hello_world.txt.gz');
    link.click();
  } catch (err) {
    console.error(err);
  }
})();