[skills] Fix fnm base directory resolution on macOS (#26552)

* fix: improve fnm base directory resolution

* address pr feedback: prefer XDG path over legacy path

* Update CHANGELOG.md

---------

Co-authored-by: raycastbot <bot@raycast.com>

Author: raulgg

extensions/skills/CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## [Fix `fnm` macOS Path Resolution] - 2026-03-28
+
+- Detect additional macOS `fnm` install locations, including `~/Library/Application Support/fnm`
+- Match the official `fnm` directory resolution preference order when resolving `fnm` paths.
+
 ## [Agent-Specific Skill Removal] - 2026-03-27
 
 - Support removing skills from specific agents instead of all agents at once

extensions/skills/src/utils/exec-options.ts

@@ -26,7 +26,7 @@ export const getExecOptions = async () => {
 
     if (!process.env.FNM_DIR) {
       const fnmBaseDir = await resolveFnmBaseDir(home);
-      if (fnmBaseDir && (await pathExists(fnmBaseDir))) {
+      if (fnmBaseDir) {
         env.FNM_DIR = fnmBaseDir;
       }
     }

extensions/skills/src/utils/node-path-resolver.ts

@@ -4,6 +4,7 @@ import { join } from "node:path";
 import semver from "semver";
 
 const isWindows = process.platform === "win32";
+const isMacOS = process.platform === "darwin";
 
 let cachedPaths: string | null = null;
 let cachedPathsPromise: Promise<string> | null = null;
@@ -65,14 +66,21 @@ const scanVersionedNodePaths = async (
 export const resolveFnmBaseDir = async (home = process.env.HOME): Promise<string | null> => {
   if (!home) return null;
 
-  const legacyFnmPath = join(home, ".fnm");
-  if (await pathExists(legacyFnmPath)) {
-    // Older fnm installs keep everything under ~/.fnm instead of XDG data directories
-    return legacyFnmPath;
+  const xdgBaseDir = join(process.env.XDG_DATA_HOME || join(home, ".local", "share"), "fnm");
+  const fnmBaseDirCandidates = [xdgBaseDir, join(home, ".fnm")];
+
+  if (isMacOS) {
+    fnmBaseDirCandidates.push(join(home, "Library", "Application Support", "fnm"));
+  }
+
+  for (const dir of fnmBaseDirCandidates) {
+    if (await pathExists(dir)) {
+      return dir;
+    }
   }
 
-  const xdgDataHome = process.env.XDG_DATA_HOME || join(home, ".local", "share");
-  return join(xdgDataHome, "fnm");
+  // Default to the XDG data dir even if it does not exist yet
+  return xdgBaseDir;
 };
 
 export const resolveVersionManagerPaths = async (): Promise<string[]> => {