diff --git a/ts_auto_deps/analyze/loader.go b/ts_auto_deps/analyze/loader.go
index 00948cd..a873edd 100644
--- a/ts_auto_deps/analyze/loader.go
+++ b/ts_auto_deps/analyze/loader.go
@@ -268,7 +268,8 @@
 func isTazeManagedRuleClass(class string) bool {
 	for _, c := range []string{
 		"ts_library",
-		"ts_declaration",
+		// TODO(alexeagle): Add ts_declaration once it can be determined
+		// if they are unused.
 		"ng_module",
 		"js_library",
 	} {
diff --git a/ts_auto_deps/analyze/query.go b/ts_auto_deps/analyze/query.go
index f62dc91..1deb627 100644
--- a/ts_auto_deps/analyze/query.go
+++ b/ts_auto_deps/analyze/query.go
@@ -397,6 +397,10 @@
 	for label, rule := range labelToRule {
 		if isTazeManagedRuleClass(rule.GetRuleClass()) || isGenerated(rule) {
 			report.UnnecessaryDependency = append(report.UnnecessaryDependency, label)
+		} else if c := rule.GetRuleClass(); c == "ts_declaration" {
+			// ts_declarations may be used even if there is no explicit import
+			// since ambient types can't be detected.
+			report.AmbiguousDependency = append(report.AmbiguousDependency, label)
 		}
 	}
 	return report, nil
diff --git a/ts_auto_deps/proto/analyze_result.proto b/ts_auto_deps/proto/analyze_result.proto
index 50208c5..e81d51b 100644
--- a/ts_auto_deps/proto/analyze_result.proto
+++ b/ts_auto_deps/proto/analyze_result.proto
@@ -60,6 +60,10 @@
   // the build.
   repeated string unnecessary_dependency = 3;
 
+  // Can't tell. These may be dependencies where no corresponding imports
+  // were found, but alwayslink=1.
+  repeated string ambiguous_dependency = 4;
+
   // Needed but not declared. If there are imports which can be satisfied
   // by more than one dependency declared in a best-matching package, list
   // all of them. If this list is not empty, we expect the build to break.