fix(noUnusedImports): don't report used val imported as type in an ex…

…ternal module

CHANGELOG.md

@@ -261,6 +261,8 @@ our [guidelines for writing a good changelog entry](https://github.com/biomejs/b
 
 - [noMisleadingCharacterClass](https://biomejs.dev/linter/rules/no-misleading-character-class/) no longer panics on malformed escape sequences that end with a multi-byte character ([#4587](https://github.com/biomejs/biome/issues/4587)). Contributed by @Conaclos
 
+- [noUnusedImports](https://biomejs.dev/linter/rules/no-unused-imports/) no longer reports used values imported as types in an external module ([#3895])(https://github.com/biomejs/biome/issues/3895). Contributed by @Conaclos
+
 ### Parser
 
 #### Bug fixes

crates/biome_js_analyze/tests/specs/correctness/noUnusedImports/valid-inner-imports.ts

@@ -0,0 +1,4 @@
+declare module "mod" {
+    import type { Ns } from "other";
+    export const C: { prop: Ns.prop };
+}

crates/biome_js_analyze/tests/specs/correctness/noUnusedImports/valid-inner-imports.ts.snap

@@ -0,0 +1,12 @@
+---
+source: crates/biome_js_analyze/tests/spec_tests.rs
+expression: valid-inner-imports.ts
+snapshot_kind: text
+---
+# Input
+```ts
+declare module "mod" {
+    import type { Ns } from "other";
+    export const C: { prop: Ns.prop };
+}
+```

crates/biome_js_semantic/src/events.rs

@@ -1034,25 +1034,19 @@ impl SemanticEventExtractor {
                     };
                     self.stash.push_back(event);
                 }
-            } else if references.iter().all(|r| matches!(r, Reference::Export(_)))
-                && self.bindings.contains_key(&name.clone().dual())
-            {
-                // Don't report an export that exports at least a binding.
-            } else if let Some(parent) = self.scopes.last_mut() {
-                // Promote these references to the parent scope
-                let parent_references = parent.references.entry(name).or_default();
-                parent_references.append(&mut references);
-            } else if let Some(info) = self.bindings.get(&name.dual()).cloned() {
-                // We are in the global scope.
-                // Try to bind some of these references to the dual binding of `name`,
-                // otherwise raide `UnresolvedReference`.
+            } else if let Some(info) = self.bindings.get(&name.clone().dual()) {
+                let mut parent_references = self
+                    .scopes
+                    .last_mut()
+                    .map(|parent| parent.references.entry(name.clone()).or_default());
+                let is_dual_imported = info.is_imported();
                 for reference in references {
                     match reference {
                         Reference::Export(_) => {
                             // An export can export both a value and a type.
-                            // If a dual binding exists, then it exports to the dual binding.
+                            // If a dual binding exists, then it exports the dual binding.
                         }
-                        Reference::AmbientRead(range) if info.is_imported() => {
+                        Reference::AmbientRead(range) if is_dual_imported => {
                             // An ambient read can only read a value,
                             // but also an imported value as a type (with the `type` modifier)
                             let declaration_before_reference =
@@ -1072,14 +1066,22 @@ impl SemanticEventExtractor {
                             };
                             self.stash.push_back(event);
                         }
-                        _ => {
-                            self.stash.push_back(SemanticEvent::UnresolvedReference {
-                                is_read: !reference.is_write(),
-                                range: reference.range(),
-                            });
+                        reference => {
+                            if let Some(parent_references) = &mut parent_references {
+                                parent_references.push(reference);
+                            } else {
+                                self.stash.push_back(SemanticEvent::UnresolvedReference {
+                                    is_read: !reference.is_write(),
+                                    range: reference.range(),
+                                });
+                            }
                         }
                     }
                 }
+            } else if let Some(parent) = self.scopes.last_mut() {
+                // Promote these references to the parent scope
+                let parent_references = parent.references.entry(name).or_default();
+                parent_references.append(&mut references);
             } else {
                 // We are in the global scope. Raise `UnresolvedReference`.
                 for reference in references {