text: const fs = require('fs');
  const path = require('path');
  const load = require('load-json-file');
  const Benchmark = require('benchmark');
  const difference = require('./');
  
  const directory = path.join(__dirname, 'test', 'in') + path.sep;
  let fixtures = fs.readdirSync(directory).map(filename => {
      return {
          filename,
          name: path.parse(filename).name,
          geojson: load.sync(directory + filename)
      };
  });
  // fixtures = fixtures.filter(({name}) => name === 'issue-#721');
  
  /**
   * Benchmark Results
   *
   * ==using martinez==
   * clip-polygons x 38,724 ops/sec ±11.98% (65 runs sampled)
   * completely-overlapped x 70,644 ops/sec ±8.29% (67 runs sampled)
   * create-hole x 62,128 ops/sec ±7.45% (75 runs sampled)
   * issue-#721-inverse x 354,473 ops/sec ±2.46% (81 runs sampled)
   * issue-#721 x 339,053 ops/sec ±3.24% (78 runs sampled)
   * multi-polygon-input x 17,728 ops/sec ±10.01% (64 runs sampled)
   * multi-polygon-target x 14,077 ops/sec ±6.52% (75 runs sampled)
   * split-polygon x 29,258 ops/sec ±8.99% (69 runs sampled)
   */
  const suite = new Benchmark.Suite('turf-difference');
  for (const {name, geojson} of fixtures) {
      suite.add(name, () => difference(geojson.features[0], geojson.features[1]));
  }
  
  suite
      .on('cycle', e => console.log(String(e.target)))
      .on('complete', () => {})
      .run();
  