feat: generator updates

packages/es-mapping-generator/src/template.js

@@ -0,0 +1,15 @@
+/**
+ * Render a template
+ * @template T
+ * @param template {T} The template to render (must be stringify-able)
+ * @param substitutions {[string, string][]} the substitutions
+ * @returns {T}
+ */
+export function renderTemplate(template, substitutions) {
+  return JSON.parse(
+    substitutions.reduce(
+      (template, [search, replace]) => template.replaceAll(search, replace),
+      JSON.stringify(template),
+    ),
+  );
+}