fix(unstable): sloppy imports should resolve .d.ts files during types resolution (#22602)

1 files changed, 102 insertions, 0 deletions

diff --git a/tests/integration/check_tests.rs b/tests/integration/check_tests.rs
index d4d996b00..e97a40141 100644
--- a/tests/integration/check_tests.rs
+++ b/tests/integration/check_tests.rs
@@ -418,3 +418,105 @@ fn npm_module_check_then_error() {
     .assert_matches_text("Check [WILDCARD]main.ts\nerror: TS2305[WILDCARD]has no exported member 'oldName'[WILDCARD]")
     .assert_exit_code(1);
 }
+
+#[test]
+fn test_unstable_sloppy_imports_dts_files() {
+  let context = TestContextBuilder::new().use_temp_cwd().build();
+  let temp_dir = context.temp_dir();
+  temp_dir.write("a.ts", "export class A {}"); // resolves this
+  temp_dir.write("a.d.ts", "export class A2 {}");
+
+  temp_dir.write("b.js", "export class B {}");
+  temp_dir.write("b.d.ts", "export class B2 {}"); // this
+
+  temp_dir.write("c.mts", "export class C {}"); // this
+  temp_dir.write("c.d.mts", "export class C2 {}");
+
+  temp_dir.write("d.mjs", "export class D {}");
+  temp_dir.write("d.d.mts", "export class D2 {}"); // this
+
+  let temp_dir = temp_dir.path();
+
+  let dir = temp_dir.join("dir_ts");
+  dir.create_dir_all();
+  dir.join("index.ts").write("export class Dir {}"); // this
+  dir.join("index.d.ts").write("export class Dir2 {}");
+
+  let dir = temp_dir.join("dir_js");
+  dir.create_dir_all();
+  dir.join("index.js").write("export class Dir {}");
+  dir.join("index.d.ts").write("export class Dir2 {}"); // this
+
+  let dir = temp_dir.join("dir_mts");
+  dir.create_dir_all();
+  dir.join("index.mts").write("export class Dir {}"); // this
+  dir.join("index.d.ts").write("export class Dir2 {}");
+
+  let dir = temp_dir.join("dir_mjs");
+  dir.create_dir_all();
+  dir.join("index.mjs").write("export class Dir {}");
+  dir.join("index.d.ts").write("export class Dir2 {}"); // this
+
+  temp_dir.join("main.ts").write(
+    r#"import * as a from "./a.js";
+import * as b from "./b.js";
+import * as c from "./c.mjs";
+import * as d from "./d.mjs";
+
+console.log(a.A);
+console.log(b.B2);
+console.log(c.C);
+console.log(d.D2);
+
+import * as a2 from "./a";
+import * as b2 from "./b";
+import * as c2 from "./c";
+import * as d2 from "./d";
+
+console.log(a2.A);
+console.log(b2.B2);
+console.log(c2.C);
+console.log(d2.D2);
+
+import * as dirTs from "./dir_ts";
+import * as dirJs from "./dir_js";
+import * as dirMts from "./dir_mts";
+import * as dirMjs from "./dir_mjs";
+
+console.log(dirTs.Dir);
+console.log(dirJs.Dir2);
+console.log(dirMts.Dir);
+console.log(dirMjs.Dir2);
+"#,
+  );
+
+  context
+    .new_command()
+    .args("check --unstable-sloppy-imports main.ts")
+    .run()
+    .assert_matches_text(
+      r#"Warning Sloppy module resolution (hint: update .js extension to .ts)
+    at file:///[WILDCARD]/main.ts:1:20
+Warning Sloppy module resolution (hint: update .mjs extension to .mts)
+    at file:///[WILDCARD]/main.ts:3:20
+Warning Sloppy module resolution (hint: add .ts extension)
+    at file:///[WILDCARD]/main.ts:11:21
+Warning Sloppy module resolution (hint: add .js extension)
+    at file:///[WILDCARD]/main.ts:12:21
+Warning Sloppy module resolution (hint: add .mts extension)
+    at file:///[WILDCARD]/main.ts:13:21
+Warning Sloppy module resolution (hint: add .mjs extension)
+    at file:///[WILDCARD]/main.ts:14:21
+Warning Sloppy module resolution (hint: specify path to index.ts file in directory instead)
+    at file:///[WILDCARD]/main.ts:21:24
+Warning Sloppy module resolution (hint: specify path to index.js file in directory instead)
+    at file:///[WILDCARD]/main.ts:22:24
+Warning Sloppy module resolution (hint: specify path to index.mts file in directory instead)
+    at file:///[WILDCARD]/main.ts:23:25
+Warning Sloppy module resolution (hint: specify path to index.mjs file in directory instead)
+    at file:///[WILDCARD]/main.ts:24:25
+Check [WILDCARD]main.ts
+"#,
+    )
+    .assert_exit_code(0);
+}