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

tests/dynamic_fixtures/javascript/koa/benign.js

@@ -0,0 +1,26 @@
+// Phase 13 — Koa middleware, benign control.
+//
+// execFile (no shell), stderr silenced, child writes nothing to stdout.
+
+'use strict';
+const Koa = require('koa');
+const { execFileSync } = require('child_process');
+
+async function ping(ctx) {
+    const host = (ctx.query && ctx.query.host) || '';
+    process.stdout.write('__NYX_SINK_HIT__\n');
+    try {
+        execFileSync('true', [host], {
+            encoding: 'utf8',
+            timeout: 5000,
+            stdio: ['ignore', 'pipe', 'ignore'],
+        });
+        ctx.body = 'ok';
+    } catch (_e) {
+        ctx.body = 'err';
+    }
+}
+
+void Koa;
+
+module.exports = { ping };