diff --git a/clang/include/clang/ExtractAPI/DeclarationFragments.h b/clang/include/clang/ExtractAPI/DeclarationFragments.h
--- a/clang/include/clang/ExtractAPI/DeclarationFragments.h
+++ b/clang/include/clang/ExtractAPI/DeclarationFragments.h
@@ -99,6 +99,23 @@
 
   const std::vector<Fragment> &getFragments() const { return Fragments; }
 
+  // Add a new Fragment to the beginning of the Fragments.
+  DeclarationFragments &appendFront(StringRef Spelling, FragmentKind Kind,
+                                    StringRef PreciseIdentifier = "",
+                                    const Decl *Declaration = nullptr) {
+    Fragments.emplace(Fragments.begin(), Spelling, Kind, PreciseIdentifier,
+                      Declaration);
+    return *this;
+  }
+
+  DeclarationFragments &appendFront(DeclarationFragments &&Other) {
+    Fragments.insert(Fragments.begin(),
+                     std::make_move_iterator(Other.Fragments.begin()),
+                     std::make_move_iterator(Other.Fragments.end()));
+    Other.Fragments.clear();
+    return *this;
+  }
+
   /// Append a new Fragment to the end of the Fragments.
   ///
   /// \returns a reference to the DeclarationFragments object itself after
diff --git a/clang/lib/ExtractAPI/ExtractAPIVisitor.cpp b/clang/lib/ExtractAPI/ExtractAPIVisitor.cpp
--- a/clang/lib/ExtractAPI/ExtractAPIVisitor.cpp
+++ b/clang/lib/ExtractAPI/ExtractAPIVisitor.cpp
@@ -338,6 +338,41 @@
   if (!LocationChecker(Decl->getLocation()))
     return true;
 
+  // Add the notion of typedef for tag type (struct or enum) of the same name.
+  if (const ElaboratedType *ET =
+          dyn_cast<ElaboratedType>(Decl->getUnderlyingType())) {
+    if (const TagType *TagTy = dyn_cast<TagType>(ET->desugar())) {
+      if (Decl->getName() == TagTy->getDecl()->getName()) {
+        if (TagTy->getDecl()->isStruct()) {
+          for (const auto &Struct : API.getStructs()) {
+            if (Decl->getName() == Struct.second.get()->Name) {
+              Struct.second.get()
+                  ->Declaration
+                  .appendFront(" ", DeclarationFragments::FragmentKind::Text)
+                  .appendFront("typedef",
+                               DeclarationFragments::FragmentKind::Keyword, "",
+                               nullptr);
+              break;
+            }
+          }
+        }
+        if (TagTy->getDecl()->isEnum()) {
+          for (const auto &Enum : API.getEnums()) {
+            if (Decl->getName() == Enum.second.get()->Name) {
+              Enum.second.get()
+                  ->Declaration
+                  .appendFront(" ", DeclarationFragments::FragmentKind::Text)
+                  .appendFront("typedef",
+                               DeclarationFragments::FragmentKind::Keyword, "",
+                               nullptr);
+              break;
+            }
+          }
+        }
+      }
+    }
+  }
+
   PresumedLoc Loc =
       Context.getSourceManager().getPresumedLoc(Decl->getLocation());
   StringRef Name = Decl->getName();
diff --git a/clang/test/ExtractAPI/typedef_struct_enum.c b/clang/test/ExtractAPI/typedef_struct_enum.c
new file mode 100644
--- /dev/null
+++ b/clang/test/ExtractAPI/typedef_struct_enum.c
@@ -0,0 +1,230 @@
+// RUN: rm -rf %t
+// RUN: split-file %s %t
+// RUN: sed -e "s@INPUT_DIR@%{/t:regex_replacement}@g" \
+// RUN: %t/reference.output.json.in >> %t/reference.output.json
+// RUN: %clang -extract-api -target arm64-apple-macosx \
+// RUN: %t/input.h -o %t/output.json | FileCheck -allow-empty %s
+
+// Generator version is not consistent across test runs, normalize it.
+// RUN: sed -e "s@\"generator\": \".*\"@\"generator\": \"?\"@g" \
+// RUN: %t/output.json >> %t/output-normalized.json
+// RUN: diff %t/reference.output.json %t/output-normalized.json
+
+// CHECK-NOT: error:
+// CHECK-NOT: warning:
+
+//--- input.h
+typedef struct Test {
+} Test;
+
+typedef enum Test2 {
+  simple
+} Test2;
+
+//--- reference.output.json.in
+{
+  "metadata": {
+    "formatVersion": {
+      "major": 0,
+      "minor": 5,
+      "patch": 3
+    },
+    "generator": "?"
+  },
+  "module": {
+    "name": "",
+    "platform": {
+      "architecture": "arm64",
+      "operatingSystem": {
+        "name": "macosx"
+      },
+      "vendor": "apple"
+    }
+  },
+  "relationships": [
+    {
+      "kind": "memberOf",
+      "source": "c:@E@Test2@simple",
+      "target": "c:@E@Test2",
+      "targetFallback": "Test2"
+    }
+  ],
+  "symbols": [
+    {
+      "accessLevel": "public",
+      "declarationFragments": [
+        {
+          "kind": "keyword",
+          "spelling": "typedef"
+        },
+        {
+          "kind": "text",
+          "spelling": " "
+        },
+        {
+          "kind": "keyword",
+          "spelling": "enum"
+        },
+        {
+          "kind": "text",
+          "spelling": " "
+        },
+        {
+          "kind": "identifier",
+          "spelling": "Test2"
+        },
+        {
+          "kind": "text",
+          "spelling": ": "
+        },
+        {
+          "kind": "typeIdentifier",
+          "preciseIdentifier": "c:i",
+          "spelling": "unsigned int"
+        },
+        {
+          "kind": "text",
+          "spelling": ";"
+        }
+      ],
+      "identifier": {
+        "interfaceLanguage": "c",
+        "precise": "c:@E@Test2"
+      },
+      "kind": {
+        "displayName": "Enumeration",
+        "identifier": "c.enum"
+      },
+      "location": {
+        "position": {
+          "character": 14,
+          "line": 4
+        },
+        "uri": "file://INPUT_DIR/input.h"
+      },
+      "names": {
+        "navigator": [
+          {
+            "kind": "identifier",
+            "spelling": "Test2"
+          }
+        ],
+        "subHeading": [
+          {
+            "kind": "identifier",
+            "spelling": "Test2"
+          }
+        ],
+        "title": "Test2"
+      },
+      "pathComponents": [
+        "Test2"
+      ]
+    },
+    {
+      "accessLevel": "public",
+      "declarationFragments": [
+        {
+          "kind": "identifier",
+          "spelling": "simple"
+        }
+      ],
+      "identifier": {
+        "interfaceLanguage": "c",
+        "precise": "c:@E@Test2@simple"
+      },
+      "kind": {
+        "displayName": "Enumeration Case",
+        "identifier": "c.enum.case"
+      },
+      "location": {
+        "position": {
+          "character": 3,
+          "line": 5
+        },
+        "uri": "file://INPUT_DIR/input.h"
+      },
+      "names": {
+        "navigator": [
+          {
+            "kind": "identifier",
+            "spelling": "simple"
+          }
+        ],
+        "subHeading": [
+          {
+            "kind": "identifier",
+            "spelling": "simple"
+          }
+        ],
+        "title": "simple"
+      },
+      "pathComponents": [
+        "Test2",
+        "simple"
+      ]
+    },
+    {
+      "accessLevel": "public",
+      "declarationFragments": [
+        {
+          "kind": "keyword",
+          "spelling": "typedef"
+        },
+        {
+          "kind": "text",
+          "spelling": " "
+        },
+        {
+          "kind": "keyword",
+          "spelling": "struct"
+        },
+        {
+          "kind": "text",
+          "spelling": " "
+        },
+        {
+          "kind": "identifier",
+          "spelling": "Test"
+        },
+        {
+          "kind": "text",
+          "spelling": ";"
+        }
+      ],
+      "identifier": {
+        "interfaceLanguage": "c",
+        "precise": "c:@S@Test"
+      },
+      "kind": {
+        "displayName": "Structure",
+        "identifier": "c.struct"
+      },
+      "location": {
+        "position": {
+          "character": 16,
+          "line": 1
+        },
+        "uri": "file://INPUT_DIR/input.h"
+      },
+      "names": {
+        "navigator": [
+          {
+            "kind": "identifier",
+            "spelling": "Test"
+          }
+        ],
+        "subHeading": [
+          {
+            "kind": "identifier",
+            "spelling": "Test"
+          }
+        ],
+        "title": "Test"
+      },
+      "pathComponents": [
+        "Test"
+      ]
+    }
+  ]
+}