Add scripts/deps.ts for external dependencies

Author: ascorbic

packages/pages-functions/scripts/deps.ts

@@ -0,0 +1,11 @@
+/**
+ * Dependencies that _are not_ bundled along with pages-functions.
+ *
+ * These must be explicitly documented with a reason why they cannot be bundled.
+ * This list is validated by `tools/deployments/validate-package-dependencies.ts`.
+ */
+export const EXTERNAL_DEPENDENCIES = [
+	// Native binary with platform-specific builds - cannot be bundled.
+	// Used to parse function files and extract exports.
+	"esbuild",
+];