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

tests/dynamic_fixtures/javascript/express/benign.js

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+// 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 };

tests/dynamic_fixtures/javascript/express/package-lock.json

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+{
+  "name": "nyx-harness-express",
+  "version": "0.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "nyx-harness-express",
+      "version": "0.0.0"
+    }
+  }
+}

tests/dynamic_fixtures/javascript/express/package.json

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+{
+  "name": "nyx-harness-express",
+  "version": "0.0.0",
+  "private": true,
+  "dependencies": {
+    "express": "^4.19.2"
+  }
+}

tests/dynamic_fixtures/javascript/express/vuln.js

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+// Phase 13 — Express route handler, vulnerable.
+//
+// Vulnerable handler concatenates `req.query.host` into a shell command.
+// Harness builds a mock req/res via js_shared::emit_express and dispatches
+// synchronously; we never bind a real listener.
+
+'use strict';
+const express = require('express');
+const { execSync } = require('child_process');
+
+function ping(req, res) {
+    const host = (req.query && req.query.host) || '';
+    process.stdout.write('__NYX_SINK_HIT__\n');
+    try {
+        const out = execSync('echo hello ' + host, { encoding: 'utf8', timeout: 5000 });
+        res.send(out);
+    } catch (e) {
+        res.send((e.stdout || '') + (e.stderr || ''));
+    }
+}
+
+// Touch the dep so the materialised package.json's `express` pin survives
+// shake-down by `npm install --no-save`; harness never starts the server.
+void express;
+
+module.exports = { ping };