core[patch]: Fix rollup warning (#5929)

* core[patch]: Fix rollup warning

* chore: lint files

* cr

langchain-core/src/prompts/template.ts

@@ -2,9 +2,11 @@ import mustache from "mustache";
 import { MessageContent } from "../messages/index.js";
 import type { InputValues } from "../utils/types/index.js";
 
-// Use unescaped HTML
-// https://github.com/janl/mustache.js?tab=readme-ov-file#variables
-mustache.escape = (text) => text;
+function configureMustache() {
+  // Use unescaped HTML
+  // https://github.com/janl/mustache.js?tab=readme-ov-file#variables
+  mustache.escape = (text) => text;
+}
 
 /**
  * Type that specifies the format of a template.
@@ -99,6 +101,7 @@ const mustacheTemplateToNodes = (
   });
 
 export const parseMustache = (template: string) => {
+  configureMustache();
   const parsed = mustache.parse(template);
   return mustacheTemplateToNodes(parsed);
 };
@@ -115,8 +118,10 @@ export const interpolateFString = (template: string, values: InputValues) =>
     return res + node.text;
   }, "");
 
-export const interpolateMustache = (template: string, values: InputValues) =>
-  mustache.render(template, values);
+export const interpolateMustache = (template: string, values: InputValues) => {
+  configureMustache();
+  return mustache.render(template, values);
+};
 
 /**
  * Type that represents a function that takes a template string and a set