From 31afcecdd849529bc5d6ae0719313f0f37e7cebc Mon Sep 17 00:00:00 2001
From: amankumarsingh77 <amankumarsingh7702@gmal.com>
Date: Sat, 2 May 2026 15:36:13 +0530
Subject: feat(util): add pure keycodes and safeJs template helper

---
 src/util/js-template.ts | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 src/util/js-template.ts

(limited to 'src/util/js-template.ts')

diff --git a/src/util/js-template.ts b/src/util/js-template.ts
new file mode 100644
index 0000000..e536b3d
--- /dev/null
+++ b/src/util/js-template.ts
@@ -0,0 +1,20 @@
+/**
+ * Build a JavaScript source string with safely-interpolated values.
+ * Every interpolated value is JSON.stringify'd, so strings, numbers,
+ * objects, and special characters all become valid JS literals.
+ *
+ * This is the ONLY supported way to build evaluation source in the
+ * codebase — never use raw template literals for JS that crosses the
+ * CDP boundary.
+ */
+export const safeJs = (
+  strings: TemplateStringsArray,
+  ...values: ReadonlyArray<unknown>
+): string => {
+  let out = strings[0] ?? "";
+  for (let i = 0; i < values.length; i++) {
+    out += JSON.stringify(values[i]);
+    out += strings[i + 1] ?? "";
+  }
+  return out;
+};
-- 
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