fix by reducing scope

packages/typescript/index.bzl

diff --git a/packages/typescript/index.bzl b/packages/typescript/index.bzl
index 7cc9586..3a1761d 100644
--- a/packages/typescript/index.bzl
+++ b/packages/typescript/index.bzl
@@ -371,7 +371,9 @@
         # Detect how we are being called.
         # If we are in our starlark module, then we load typescript from the ts_repositories fetch.
         # Otherwise, we are being called with in the @npm external repo
-        if native.repository_name() != "build_bazel_rules_nodejs" and native.repository_name() != "@":
+        if native.repository_name() == "build_bazel_rules_nodejs" or native.repository_name() == "@":
+            tsc = Label("@npm//typescript/bin:tsc")
+        else:
             tsc = Label("//typescript/bin:tsc")
 
     if type(extends) == type([]):

packages/typescript/internal/ts_project.bzl

diff --git a/packages/typescript/internal/ts_project.bzl b/packages/typescript/internal/ts_project.bzl
index fe92110..c622c6a 100644
--- a/packages/typescript/internal/ts_project.bzl
+++ b/packages/typescript/internal/ts_project.bzl
@@ -28,7 +28,7 @@
     # that compiler might allow more sources than tsc does.
     "srcs": attr.label_list(allow_files = True, mandatory = True),
     "supports_workers": attr.bool(default = False),
-    "tsc": attr.label(default = Label("@npm//typescript/bin:tsc"), executable = True, cfg = "exec"),
+    "tsc": attr.label(executable = True, cfg = "exec"),
     "transpile": attr.bool(doc = "whether tsc should be used to produce .js outputs"),
     "tsconfig": attr.label(mandatory = True, allow_single_file = [".json"]),
 }