kraken-loader/test/compiler.js

Kraken.io image optimisation loader for Webpack 2+

const path = require('path');
const webpack = require('webpack');
const MemoryFs = require('memory-fs');

module.exports = (fixture, options = {}) => {
  const compiler = webpack({
    context: __dirname,
    entry: `./${fixture}`,
    output: {
      path: path.resolve(__dirname),
      filename: 'bundle.js'
    },
    module: {
      rules: [{
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[name].[ext]'
            }
          },
          {
            loader: '../index',
            // loader: loader, // Function
            options
          }
        ]
      }]
    }
  });

  compiler.outputFileSystem = new MemoryFs();

  return new Promise((resolve, reject) => {
    compiler.run((err, stats) => {
      if (err || stats.hasErrors()) {
        // @todo Try and find better docs on Webpack's Error Handling API
        reject(err || new Error(stats.toJson().errors[0]));
      }

      resolve(stats);
    });
  });
};