benchmark: add require() benchmark for exports packages

Signed-off-by: James Ross <james@jross.me>

Author: Cherry

benchmark/module/module-require-exports.js

@@ -0,0 +1,43 @@
+'use strict';
+
+// require() of a package that is already loaded, from a directory other than
+// the one that first loaded it, with and without package.json "exports".
+
+const fs = require('fs');
+const path = require('path');
+const { createRequire } = require('module');
+const common = require('../common.js');
+const tmpdir = require('../../test/common/tmpdir');
+
+const bench = common.createBenchmark(main, {
+  exports: ['true', 'false'],
+  n: [1e5],
+});
+
+function main({ exports, n }) {
+  tmpdir.refresh();
+  const root = tmpdir.resolve('nodejs-benchmark-module-exports');
+  const pkgDir = path.join(root, 'node_modules', 'pkg');
+  const consumerDir = path.join(root, 'node_modules', 'consumer');
+  fs.mkdirSync(pkgDir, { recursive: true });
+  fs.mkdirSync(consumerDir);
+
+  const manifest = { name: 'pkg', main: 'index.js' };
+  if (exports === 'true') {
+    manifest.exports = './index.js';
+  }
+  fs.writeFileSync(path.join(pkgDir, 'package.json'), JSON.stringify(manifest));
+  fs.writeFileSync(path.join(pkgDir, 'index.js'), 'module.exports = {};');
+  fs.writeFileSync(path.join(consumerDir, 'index.js'),
+                   'module.exports = () => require("pkg");');
+
+  const rootRequire = createRequire(path.join(root, 'index.js'));
+  rootRequire('pkg');
+  const load = rootRequire('consumer');
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    load();
+  }
+  bench.end(n);
+}