benchmark: add require-esm benchmark

PR-URL: #52166
Refs: #52134
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Filip Skokan <[email protected]>
Reviewed-By: Chengzhong Wu <[email protected]>
Reviewed-By: Guy Bedford <[email protected]>
Reviewed-By: Geoffrey Booth <[email protected]>

benchmark/esm/require-esm.js

@@ -0,0 +1,79 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+const path = require('path');
+const assert = require('assert');
+
+const bench = common.createBenchmark(main, {
+  type: ['all', 'access', 'load'],
+  exports: ['default', 'named'],
+  n: [1000],
+}, {
+  flags: ['--experimental-require-module', '--no-warnings'],
+});
+
+function prepare(count, useDefault) {
+  tmpdir.refresh();
+  const dir = tmpdir.resolve('modules');
+  fs.mkdirSync(dir, { recursive: true });
+  let mainSource = '';
+  let useSource = 'exports.access = function() { return 0';
+  for (let i = 0; i < count; ++i) {
+    let modSource = `const value${i} = 1;\n`;
+    if (useDefault) {
+      modSource += `export default { value${i} }\n`;
+    } else {
+      modSource += `export { value${i} };\n`;
+    }
+    const filename = `mod${i}.mjs`;
+    fs.writeFileSync(
+      path.resolve(dir, filename),
+      modSource,
+      'utf8',
+    );
+    mainSource += `const mod${i} = require('./modules/${filename}');\n`;
+    if (useDefault) {
+      useSource += ` + mod${i}.default.value${i}`;
+    } else {
+      useSource += ` + mod${i}.value${i}`;
+    }
+  }
+  useSource += '; };\n';
+  const script = tmpdir.resolve('main.js');
+  fs.writeFileSync(script, mainSource + useSource, 'utf8');
+  return script;
+}
+
+function main({ n, exports, type }) {
+  const script = prepare(n, exports === 'default');
+  switch (type) {
+    case 'all': {
+      bench.start();
+      const result = require(script).access();
+      bench.end(n);
+      assert.strictEqual(result, n);
+      break;
+    }
+    case 'access': {
+      const { access } = require(script);
+      bench.start();
+      let result = access();
+      for (let i = 0; i < 99; ++i) {
+        result = access();
+      }
+      bench.end(n * 100);
+      assert.strictEqual(result, n);
+      break;
+    }
+    case 'load': {
+      bench.start();
+      const { access } = require(script);
+      bench.end(n);
+      const result = access();
+      assert.strictEqual(result, n);
+      break;
+    }
+  }
+}