src: add cache to nearest parent package json

IlyasShabi · targos · commit d89390fc8f7e · 2025-07-22T08:41:17.000+02:00
PR-URL: #59086 Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: Jacob Smith <jacob@frende.me> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
diff --git a/lib/internal/modules/package_json_reader.js b/lib/internal/modules/package_json_reader.js
@@ -5,6 +5,7 @@ const {
   JSONParse,
   ObjectDefineProperty,
   RegExpPrototypeExec,
+  SafeMap,
   StringPrototypeIndexOf,
   StringPrototypeSlice,
 } = primordials;
@@ -28,6 +29,8 @@ const path = require('path');
 const { validateString } = require('internal/validators');
 const internalFsBinding = internalBinding('fs');
 
+const nearestParentPackageJSONCache = new SafeMap();
+
 /**
  * @typedef {import('typings/internalBinding/modules').DeserializedPackageConfig} DeserializedPackageConfig
  * @typedef {import('typings/internalBinding/modules').PackageConfig} PackageConfig
@@ -131,13 +134,21 @@ function read(jsonPath, { base, specifier, isESM } = kEmptyObject) {
  * @returns {undefined | DeserializedPackageConfig}
  */
 function getNearestParentPackageJSON(checkPath) {
+  if (nearestParentPackageJSONCache.has(checkPath)) {
+    return nearestParentPackageJSONCache.get(checkPath);
+  }
+
   const result = modulesBinding.getNearestParentPackageJSON(checkPath);
 
   if (result === undefined) {
+    nearestParentPackageJSONCache.set(checkPath, undefined);
     return undefined;
   }
 
-  return deserializePackageJSON(checkPath, result);
+  const packageConfig = deserializePackageJSON(checkPath, result);
+  nearestParentPackageJSONCache.set(checkPath, packageConfig);
+
+  return packageConfig;
 }
 
 /**
