module: use Wasm CJS lexer when available

PR-URL: https://github.com/nodejs/node/pull/35583
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Geoffrey Booth <webmaster@geoffreybooth.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/benchmark/esm/cjs-parse.js b/benchmark/esm/cjs-parse.js
new file mode 100644
index 00000000000..325b362a057
--- /dev/null
+++ b/benchmark/esm/cjs-parse.js
@@ -0,0 +1,40 @@
+'use strict';
+const fs = require('fs');
+const path = require('path');
+const common = require('../common.js');
+const { strictEqual } = require('assert');
+
+const tmpdir = require('../../test/common/tmpdir');
+const benchmarkDirectory =
+  path.resolve(tmpdir.path, 'benchmark-esm-parse');
+
+const bench = common.createBenchmark(main, {
+  n: [1e2]
+});
+
+async function main({ n }) {
+  tmpdir.refresh();
+
+  fs.mkdirSync(benchmarkDirectory);
+
+  let sampleSource = 'try {\n';
+  for (let i = 0; i < 1000; i++) {
+    sampleSource += 'sample.js(() => file = /test/);\n';
+  }
+  sampleSource += '} catch {}\nexports.p = 5;\n';
+
+  for (let i = 0; i < n; i++) {
+    const sampleFile = path.join(benchmarkDirectory, `sample${i}.js`);
+    fs.writeFileSync(sampleFile, sampleSource);
+  }
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    const sampleFile = path.join(benchmarkDirectory, `sample${i}.js`);
+    const m = await import('file:' + sampleFile);
+    strictEqual(m.p, 5);
+  }
+  bench.end(n);
+
+  tmpdir.refresh();
+}