fix(lsp/check): don't resolve unknown media types to a .js extension (#27631)

Fixes https://github.com/denoland/deno/issues/25762. Note that some of
the things in that issue are not resolved (vite/client types not working
properly which has other root causes), but the wildcard module
augmentation specifically is fixed by this.

We were telling TSC that files with unknown media types had an extension
of `.js`, so the ambient module declarations weren't applying. Instead,
just don't resolve them, so the ambient declaration applies.

cli/lsp/tsc.rs

@@ -4509,11 +4509,12 @@ fn op_release(
 
 #[op2]
 #[serde]
+#[allow(clippy::type_complexity)]
 fn op_resolve(
   state: &mut OpState,
   #[string] base: String,
   #[serde] specifiers: Vec<(bool, String)>,
-) -> Result<Vec<Option<(String, String)>>, deno_core::url::ParseError> {
+) -> Result<Vec<Option<(String, Option<String>)>>, deno_core::url::ParseError> {
   op_resolve_inner(state, ResolveArgs { base, specifiers })
 }
 
@@ -4595,10 +4596,11 @@ async fn op_poll_requests(
 }
 
 #[inline]
+#[allow(clippy::type_complexity)]
 fn op_resolve_inner(
   state: &mut OpState,
   args: ResolveArgs,
-) -> Result<Vec<Option<(String, String)>>, deno_core::url::ParseError> {
+) -> Result<Vec<Option<(String, Option<String>)>>, deno_core::url::ParseError> {
   let state = state.borrow_mut::<State>();
   let mark = state.performance.mark_with_args("tsc.op.op_resolve", &args);
   let referrer = state.specifier_map.normalize(&args.base)?;
@@ -4611,7 +4613,11 @@ fn op_resolve_inner(
       o.map(|(s, mt)| {
         (
           state.specifier_map.denormalize(&s),
-          mt.as_ts_extension().to_string(),
+          if matches!(mt, MediaType::Unknown) {
+            None
+          } else {
+            Some(mt.as_ts_extension().to_string())
+          },
         )
       })
     })
@@ -6461,7 +6467,7 @@ mod tests {
       resolved,
       vec![Some((
         temp_dir.url().join("b.ts").unwrap().to_string(),
-        MediaType::TypeScript.as_ts_extension().to_string()
+        Some(MediaType::TypeScript.as_ts_extension().to_string())
       ))]
     );
   }

cli/tsc/99_main_compiler.js

@@ -723,7 +723,7 @@ delete Object.prototype.__proto__;
           }
           : arg;
         if (fileReference.fileName.startsWith("npm:")) {
-          /** @type {[string, ts.Extension] | undefined} */
+          /** @type {[string, ts.Extension | null] | undefined} */
           const resolved = ops.op_resolve(
             containingFilePath,
             [
@@ -735,7 +735,7 @@ delete Object.prototype.__proto__;
               ],
             ],
           )?.[0];
-          if (resolved) {
+          if (resolved && resolved[1]) {
             return {
               resolvedTypeReferenceDirective: {
                 primary: true,
@@ -785,7 +785,7 @@ delete Object.prototype.__proto__;
         debug(`  base: ${base}`);
         debug(`  specifiers: ${specifiers.map((s) => s[1]).join(", ")}`);
       }
-      /** @type {Array<[string, ts.Extension] | undefined>} */
+      /** @type {Array<[string, ts.Extension | null] | undefined>} */
       const resolved = ops.op_resolve(
         base,
         specifiers,
@@ -793,7 +793,7 @@ delete Object.prototype.__proto__;
       if (resolved) {
         /** @type {Array<ts.ResolvedModuleWithFailedLookupLocations>} */
         const result = resolved.map((item) => {
-          if (item) {
+          if (item && item[1]) {
             const [resolvedFileName, extension] = item;
             return {
               resolvedModule: {

cli/tsc/mod.rs

@@ -746,7 +746,7 @@ fn op_resolve(
   state: &mut OpState,
   #[string] base: String,
   #[serde] specifiers: Vec<(bool, String)>,
-) -> Result<Vec<(String, &'static str)>, ResolveError> {
+) -> Result<Vec<(String, Option<&'static str>)>, ResolveError> {
   op_resolve_inner(state, ResolveArgs { base, specifiers })
 }
 
@@ -754,9 +754,9 @@ fn op_resolve(
 fn op_resolve_inner(
   state: &mut OpState,
   args: ResolveArgs,
-) -> Result<Vec<(String, &'static str)>, ResolveError> {
+) -> Result<Vec<(String, Option<&'static str>)>, ResolveError> {
   let state = state.borrow_mut::<State>();
-  let mut resolved: Vec<(String, &'static str)> =
+  let mut resolved: Vec<(String, Option<&'static str>)> =
     Vec::with_capacity(args.specifiers.len());
   let referrer = if let Some(remapped_specifier) =
     state.maybe_remapped_specifier(&args.base)
@@ -770,14 +770,14 @@ fn op_resolve_inner(
     if specifier.starts_with("node:") {
       resolved.push((
         MISSING_DEPENDENCY_SPECIFIER.to_string(),
-        MediaType::Dts.as_ts_extension(),
+        Some(MediaType::Dts.as_ts_extension()),
       ));
       continue;
     }
 
     if specifier.starts_with("asset:///") {
       let ext = MediaType::from_str(&specifier).as_ts_extension();
-      resolved.push((specifier, ext));
+      resolved.push((specifier, Some(ext)));
       continue;
     }
 
@@ -857,14 +857,15 @@ fn op_resolve_inner(
         (
           specifier_str,
           match media_type {
-            MediaType::Css => ".js", // surface these as .js for typescript
-            media_type => media_type.as_ts_extension(),
+            MediaType::Css => Some(".js"), // surface these as .js for typescript
+            MediaType::Unknown => None,
+            media_type => Some(media_type.as_ts_extension()),
           },
         )
       }
       None => (
         MISSING_DEPENDENCY_SPECIFIER.to_string(),
-        MediaType::Dts.as_ts_extension(),
+        Some(MediaType::Dts.as_ts_extension()),
       ),
     };
     log::debug!("Resolved {} from {} to {:?}", specifier, referrer, result);
@@ -1441,7 +1442,10 @@ mod tests {
       },
     )
     .expect("should have invoked op");
-    assert_eq!(actual, vec![("https://deno.land/x/b.ts".into(), ".ts")]);
+    assert_eq!(
+      actual,
+      vec![("https://deno.land/x/b.ts".into(), Some(".ts"))]
+    );
   }
 
   #[tokio::test]
@@ -1460,7 +1464,10 @@ mod tests {
       },
     )
     .expect("should have not errored");
-    assert_eq!(actual, vec![(MISSING_DEPENDENCY_SPECIFIER.into(), ".d.ts")]);
+    assert_eq!(
+      actual,
+      vec![(MISSING_DEPENDENCY_SPECIFIER.into(), Some(".d.ts"))]
+    );
   }
 
   #[tokio::test]

tests/integration/lsp_tests.rs

@@ -17221,3 +17221,38 @@ fn lsp_wasm_module() {
   );
   client.shutdown();
 }
+
+#[test]
+fn wildcard_augment() {
+  let context = TestContextBuilder::new().use_temp_cwd().build();
+  let mut client = context.new_lsp_command().build();
+  let temp_dir = context.temp_dir().path();
+  let source = source_file(
+    temp_dir.join("index.ts"),
+    r#"
+      import styles from "./hello_world.scss";
+
+      function bar(v: string): string {
+        return v;
+      }
+
+      bar(styles);
+    "#,
+  );
+  temp_dir.join("index.d.ts").write(
+    r#"
+      declare module '*.scss' {
+        const content: string;
+        export default content;
+      }
+    "#,
+  );
+  temp_dir
+    .join("hello_world.scss")
+    .write("body { color: red; }");
+
+  client.initialize_default();
+
+  let diagnostics = client.did_open_file(&source);
+  assert_eq!(diagnostics.all().len(), 0);
+}