diff --git a/src/transform.ts b/src/transform.ts
index 348af62..e1a386a 100644
--- a/src/transform.ts
+++ b/src/transform.ts
@@ -261,6 +261,17 @@ export function hasExportDefault(content: string) {
       for (const element of node.exportClause.elements) {
         if (element.name.escapedText === 'default') {
           has = true
+          break
+        }
+      }
+    } else if ('modifiers' in node && Array.isArray(node.modifiers) && node.modifiers.length > 1) {
+      for (let i = 0, len = node.modifiers.length; i < len; ++i) {
+        if (
+          node.modifiers[i].kind === ts.SyntaxKind.ExportKeyword &&
+          node.modifiers[i + 1]?.kind === ts.SyntaxKind.DefaultKeyword
+        ) {
+          has = true
+          break
         }
       }
     }
diff --git a/tests/transform.spec.ts b/tests/transform.spec.ts
index c8a28d3..39a160c 100644
--- a/tests/transform.spec.ts
+++ b/tests/transform.spec.ts
@@ -172,6 +172,14 @@ describe('transform tests', () => {
     expect(hasExportDefault("export { foo, sdk } from './sdk'")).toBe(false)
     expect(hasExportDefault("export { foo as baz, sdk } from './sdk'")).toBe(false)
     expect(hasExportDefault("export { default } from './sdk'")).toBe(true)
-    expect(hasExportDefault("export { sdkas, default } from './sdk'")).toBe(true)
+    expect(hasExportDefault("export { sdk, default } from './sdk'")).toBe(true)
+    expect(hasExportDefault("export { sdk, default as baz } from './sdk'")).toBe(false)
+    expect(hasExportDefault('export default class Test {}')).toBe(true)
+    expect(hasExportDefault('export class Test {}')).toBe(false)
+    expect(hasExportDefault('export default function test() {}')).toBe(true)
+    expect(hasExportDefault('export function test() {}')).toBe(false)
+    expect(hasExportDefault('const a = 1\nexport default a')).toBe(true)
+    expect(hasExportDefault('const a = 1\nexport { a }')).toBe(false)
+    expect(hasExportDefault('const a = 1\nexport { a as default }')).toBe(true)
   })
 })