[pitboss] phase 13: Track B — JavaScript + TypeScript harness emitter shapes

tests/dynamic_fixtures/javascript/express/benign.js

@@ -0,0 +1,28 @@
+// Phase 13 — Express route handler, benign control.
+//
+// Uses execFile (no shell) so the payload bytes are never interpreted as
+// shell metacharacters.  The oracle marker cannot appear in stdout because
+// the inner child reads `true` and its stdio is ignored.
+
+'use strict';
+const express = require('express');
+const { execFileSync } = require('child_process');
+
+function ping(req, res) {
+    const host = (req.query && req.query.host) || '';
+    process.stdout.write('__NYX_SINK_HIT__\n');
+    try {
+        execFileSync('true', [host], {
+            encoding: 'utf8',
+            timeout: 5000,
+            stdio: ['ignore', 'pipe', 'ignore'],
+        });
+        res.send('ok');
+    } catch (_e) {
+        res.send('err');
+    }
+}
+
+void express;
+
+module.exports = { ping };