fix(unstable): disable importing from the vendor directory (#20067)

Some people might get think they need to import from this directory,
which could cause confusion and duplicate dependencies. Additionally,
the `vendor` directory has special behaviour in the language server, so
importing from the folder will definitely cause confusion and issues
there.

1 files changed, 13 insertions, 0 deletions

diff --git a/cli/tests/integration/run_tests.rs b/cli/tests/integration/run_tests.rs
index 2ac6ed985..0c39c2b72 100644
--- a/cli/tests/integration/run_tests.rs
+++ b/cli/tests/integration/run_tests.rs
@@ -4580,4 +4580,17 @@ console.log(returnsHi());"#,
     .args("run --vendor http://localhost:4545/subdir/CAPITALS/hello_there.ts")
     .run()
     .assert_matches_text("hello there\n");
+
+  // now try importing directly from the vendor folder
+  temp_dir.write(
+    "main.ts",
+    r#"import { returnsHi } from './vendor/http_localhost_4545/subdir/mod1.ts';
+console.log(returnsHi());"#,
+  );
+  deno_run_cmd
+    .run()
+    .assert_matches_text("error: Importing from the vendor directory is not permitted. Use a remote specifier instead or disable vendoring.
+    at [WILDCARD]/main.ts:1:27
+")
+    .assert_exit_code(1);
 }