From d200a215594bdda07e130117c9d392fff29cba84 Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Thu, 26 Mar 2026 10:18:40 -0700
Subject: [PATCH] [Fix] `nvm_normalize_lts`: only reject uppercase for LTS
 names, not regular aliases

The lowercase check was in the `*` catch-all branch of the `case` statement, rejecting any alias name with uppercase characters.
This prevented creating or reading uppercase aliases like `TESTY`.
The check should only apply to `lts/*` patterns, since LTS codenames are always lowercase.

Fixes #3764.
Bug introduced in https://github.com/nvm-sh/nvm/commit/9fb9dec710e2c8d3aecb24c2a7c9f9fb45b1435b as part of fixing #3417.
---
 nvm.sh                                        | 12 ++++--
 .../Aliases/uppercase alias names should work | 37 +++++++++++++++++++
 2 files changed, 45 insertions(+), 4 deletions(-)
 create mode 100755 test/fast/Aliases/uppercase alias names should work

diff --git a/nvm.sh b/nvm.sh
index 7268de2..b2f45ea 100755
--- a/nvm.sh
+++ b/nvm.sh
@@ -935,10 +935,14 @@ nvm_normalize_lts() {
       fi
     ;;
     *)
-      if [ "${LTS}" != "$(echo "${LTS}" | command tr '[:upper:]' '[:lower:]')" ]; then
-        nvm_err 'LTS names must be lowercase'
-        return 3
-      fi
+      case "${LTS}" in
+        lts/*)
+          if [ "${LTS}" != "$(echo "${LTS}" | command tr '[:upper:]' '[:lower:]')" ]; then
+            nvm_err 'LTS names must be lowercase'
+            return 3
+          fi
+        ;;
+      esac
       nvm_echo "${LTS}"
     ;;
   esac
diff --git a/test/fast/Aliases/uppercase alias names should work b/test/fast/Aliases/uppercase alias names should work
new file mode 100755
index 0000000..ed38974
--- /dev/null
+++ b/test/fast/Aliases/uppercase alias names should work	
@@ -0,0 +1,37 @@
+#!/bin/sh
+
+die () { echo "$@" ; cleanup ; exit 1; }
+
+cleanup() {
+  rm -f "$(nvm_alias_path)/UPPER_ALIAS"
+  rm -f "$(nvm_alias_path)/MixedCase"
+}
+
+: nvm.sh
+\. ../../../nvm.sh
+
+\. ../../common.sh
+
+make_fake_node v0.0.1
+
+# Uppercase alias should be created and readable
+nvm alias UPPER_ALIAS v0.0.1
+[ -f "$(nvm_alias_path)/UPPER_ALIAS" ] || die "uppercase alias file should exist"
+
+try nvm_alias UPPER_ALIAS
+[ "${CAPTURED_EXIT_CODE}" = "0" ] || die "nvm_alias should succeed for uppercase alias, got exit code ${CAPTURED_EXIT_CODE}"
+[ "${CAPTURED_STDOUT}" = "v0.0.1" ] || die "nvm_alias UPPER_ALIAS should return v0.0.1, got ${CAPTURED_STDOUT}"
+
+# Mixed case should also work
+nvm alias MixedCase v0.0.1
+[ -f "$(nvm_alias_path)/MixedCase" ] || die "mixed case alias file should exist"
+
+try nvm_alias MixedCase
+[ "${CAPTURED_EXIT_CODE}" = "0" ] || die "nvm_alias should succeed for mixed case alias, got exit code ${CAPTURED_EXIT_CODE}"
+
+# LTS names with uppercase should still be rejected
+try_err nvm_normalize_lts "lts/ARGON"
+[ "${CAPTURED_EXIT_CODE}" = "3" ] || die "uppercase LTS name should fail with exit code 3, got ${CAPTURED_EXIT_CODE}"
+[ "${CAPTURED_STDERR}" = "LTS names must be lowercase" ] || die "expected lowercase error, got ${CAPTURED_STDERR}"
+
+cleanup