From 23da1d8dacb8c51ca6eb13d4006597c14d2130fe Mon Sep 17 00:00:00 2001
From: sapphi-red <49056869+sapphi-red@users.noreply.github.com>
Date: Fri, 9 Jan 2026 18:47:01 +0900
Subject: [PATCH] test: add test to point out tsconfig cache pollution

---
 .../tsconfig/cases/simple-paths/bar/index.ts  |  0
 fixtures/tsconfig/cases/simple-paths/foo.ts   |  0
 .../tsconfig/cases/simple-paths/tsconfig.json |  7 +++
 src/tests/tsconfig_paths.rs                   | 48 +++++++++++++++++++
 4 files changed, 55 insertions(+)
 create mode 100644 fixtures/tsconfig/cases/simple-paths/bar/index.ts
 create mode 100644 fixtures/tsconfig/cases/simple-paths/foo.ts
 create mode 100644 fixtures/tsconfig/cases/simple-paths/tsconfig.json

diff --git a/fixtures/tsconfig/cases/simple-paths/bar/index.ts b/fixtures/tsconfig/cases/simple-paths/bar/index.ts
new file mode 100644
index 00000000..e69de29b
diff --git a/fixtures/tsconfig/cases/simple-paths/foo.ts b/fixtures/tsconfig/cases/simple-paths/foo.ts
new file mode 100644
index 00000000..e69de29b
diff --git a/fixtures/tsconfig/cases/simple-paths/tsconfig.json b/fixtures/tsconfig/cases/simple-paths/tsconfig.json
new file mode 100644
index 00000000..071bf3fe
--- /dev/null
+++ b/fixtures/tsconfig/cases/simple-paths/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "compilerOptions": {
+    "paths": {
+      "bar/*": ["./bar/*"]
+    }
+  }
+}
diff --git a/src/tests/tsconfig_paths.rs b/src/tests/tsconfig_paths.rs
index 4146afa7..783551f7 100644
--- a/src/tests/tsconfig_paths.rs
+++ b/src/tests/tsconfig_paths.rs
@@ -292,6 +292,54 @@ fn test_parent_base_url() {
     }
 }
 
+#[test]
+fn test_tsconfig_mixed_root_non_root_cache() {
+    let f = super::fixture_root().join("tsconfig");
+    let f2 = f.join("cases").join("simple-paths");
+
+    // NOTE: should remove this line before merging as it's not thread safe
+    std::env::set_current_dir(&f2).unwrap();
+
+    let resolver = Resolver::new(ResolveOptions {
+        tsconfig: Some(TsconfigDiscovery::Auto),
+        ..ResolveOptions::default()
+    });
+    resolver.cache.get_tsconfig(false, &f2.join("tsconfig.json"), |_| Ok(())).unwrap();
+    let resolved_path =
+        resolver.resolve_file(f2.join("foo.ts"), "bar/index.ts").map(|f| f.full_path());
+    assert_eq!(resolved_path, Ok(f2.join("bar/index.ts")));
+}
+
+#[test]
+fn test_tsconfig_mixed_root_non_root_cache2() {
+    let f = super::fixture_root().join("tsconfig");
+    let f2 = f.join("cases").join("extends-paths");
+
+    let resolver = Resolver::new(ResolveOptions {
+        tsconfig: Some(TsconfigDiscovery::Auto),
+        ..ResolveOptions::default()
+    });
+    resolver.cache.get_tsconfig(true, &f2.join("tsconfig.base.json"), |_| Ok(())).unwrap();
+    let resolved_path =
+        resolver.resolve_file(f2.join("test.ts"), "@/index.js").map(|f| f.full_path());
+    assert_eq!(resolved_path, Ok(f2.join("src/index.js")));
+}
+
+#[test]
+fn test_tsconfig_mixed_root_non_root_cache3() {
+    let f = super::fixture_root().join("tsconfig");
+    let f2 = f.join("cases").join("extends-paths");
+
+    let resolver = Resolver::new(ResolveOptions {
+        tsconfig: Some(TsconfigDiscovery::Auto),
+        ..ResolveOptions::default()
+    });
+    resolver.cache.get_tsconfig(false, &f2.join("tsconfig.json"), |_| Ok(())).unwrap();
+    let resolved_path =
+        resolver.resolve_file(f2.join("test.ts"), "@/index.js").map(|f| f.full_path());
+    assert_eq!(resolved_path, Ok(f2.join("src/index.js")));
+}
+
 #[cfg(not(target_os = "windows"))] // MemoryFS's path separator is always `/` so the test will not pass in windows.
 mod windows_test {
     use std::path::{Path, PathBuf};