Rqrr-wasm NPM | npm.io

rqrr-wasm

An npm module that use rqrr compiled to wasm to use easily in your webpack project.

Instructions

Install the module with its peer dependencies

yarn add rqrr-wasm memory-fs fs-extra

Add the webpack plugin to your webpack configuration

import RqrrWasmPlugin from 'rqrr-wasm/dist/webpack-plugins';

// webpack configuration file
webpackConfig = {
  plugins: [
    // other plugins
    new RqrrWasmPlugin(), // put this last
  ],
}

Import the module in your code

import wasmModule from 'rqrr-wasm';

Call init() to load the .wasm file, then you can decode a QR code by passing an Uint8Array of the image data

wasmModule.init().then(() => {
  const canvas = document.createElement('canvas');
  canvas.width = 300;
  canvas.height = 300;

  canvas.getContext('2d').drawImage(video, 0, 0, canvas.width, canvas.height);
  canvas.toBlob(blob => {
    const reader = new FileReader();

    reader.addEventListener('loadend', () => {
      const arrayBuffer = reader.result;
      const output = wasmModule.decode(new Uint8Array(arrayBuffer));

      console.log("DECODED QR: ", output); // the string output here!
    });

    reader.readAsArrayBuffer(blob);
  });
});