diff --git a/packages/ts-migrate-server/src/migrate/index.ts b/packages/ts-migrate-server/src/migrate/index.ts
index 86cfa94..96e5e7b 100644
--- a/packages/ts-migrate-server/src/migrate/index.ts
+++ b/packages/ts-migrate-server/src/migrate/index.ts
@@ -20,7 +20,7 @@ export default async function migrate({
   config,
   sources,
   lintConfig,
-}: MigrateParams): Promise<number> {
+}: MigrateParams): Promise<{ exitCode: number; updatedSourceFiles: Set<string> }> {
   let exitCode = 0;
   log.info(`TypeScript version: ${ts.version}`);
 
@@ -115,7 +115,7 @@ export default async function migrate({
 
   log.info(`Wrote ${updatedSourceFiles.size} updated file(s) in ${writeTimer.elapsedStr()}.`);
 
-  return exitCode;
+  return { updatedSourceFiles, exitCode };
 }
 
 function getSourceFilesToMigrate(project: Project) {
diff --git a/packages/ts-migrate-server/tests/commands/migrate/migrate.test.ts b/packages/ts-migrate-server/tests/commands/migrate/migrate.test.ts
index b2738d8..39f0e8a 100644
--- a/packages/ts-migrate-server/tests/commands/migrate/migrate.test.ts
+++ b/packages/ts-migrate-server/tests/commands/migrate/migrate.test.ts
@@ -38,7 +38,7 @@ describe('migrate command', () => {
       {},
     );
 
-    const exitCode = await migrate({ rootDir, config });
+    const { exitCode } = await migrate({ rootDir, config });
     fs.unlinkSync(path.resolve(rootDir, 'tsconfig.json'));
     const [rootData, outputData] = getDirData(rootDir, outputDir);
     expect(rootData).toEqual(outputData);
@@ -65,7 +65,7 @@ describe('migrate command', () => {
         {},
       );
 
-      const exitCode = await migrate({
+      const { exitCode } = await migrate({
         rootDir,
         config,
         sources: 'index.ts',
@@ -95,7 +95,7 @@ describe('migrate command', () => {
         {},
       );
 
-      const exitCode = await migrate({
+      const { exitCode, updatedSourceFiles } = await migrate({
         rootDir,
         config,
         sources: path.resolve(rootDir, 'index.ts'),
@@ -104,6 +104,11 @@ describe('migrate command', () => {
       const [rootData, outputData] = getDirData(rootDir, outputDir);
       expect(rootData).toEqual(outputData);
       expect(exitCode).toBe(0);
+
+      const pathsRelativeToOutputDir = Array.from(updatedSourceFiles).map((filePath) =>
+        path.relative(rootDir, filePath),
+      );
+      expect(pathsRelativeToOutputDir).toEqual(['index.ts']);
     });
   });
 
@@ -137,7 +142,7 @@ describe('migrate command', () => {
         {},
       );
 
-    const exitCode = await migrate({ rootDir, config });
+    const { exitCode } = await migrate({ rootDir, config });
     fs.unlinkSync(path.resolve(rootDir, 'tsconfig.json'));
     const [rootData, outputData] = getDirData(rootDir, outputDir);
     expect(rootData).toEqual(outputData);
diff --git a/packages/ts-migrate/cli.ts b/packages/ts-migrate/cli.ts
index 4557c87..d110205 100644
--- a/packages/ts-migrate/cli.ts
+++ b/packages/ts-migrate/cli.ts
@@ -186,7 +186,7 @@ yargs
           .addPlugin(eslintFixPlugin, {});
       }
 
-      const exitCode = await migrate({ rootDir, config, sources });
+      const { exitCode } = await migrate({ rootDir, config, sources });
 
       process.exit(exitCode);
     },
@@ -239,7 +239,7 @@ yargs
         })
         .addPlugin(eslintFixChangedPlugin, {});
 
-      const exitCode = await migrate({ rootDir, config });
+      const { exitCode } = await migrate({ rootDir, config });
 
       process.exit(exitCode);
     },
diff --git a/packages/ts-migrate/tests/commands/migrate/migrate.test.ts b/packages/ts-migrate/tests/commands/migrate/migrate.test.ts
index 8c1e60b..e4468e9 100644
--- a/packages/ts-migrate/tests/commands/migrate/migrate.test.ts
+++ b/packages/ts-migrate/tests/commands/migrate/migrate.test.ts
@@ -29,7 +29,7 @@ describe('migrate command', () => {
       .addPlugin(tsIgnorePlugin, { messagePrefix: 'FIXME' })
       .addPlugin(eslintFixPlugin, {});
 
-    const exitCode = await migrate({ rootDir, config });
+    const { exitCode } = await migrate({ rootDir, config });
     const [rootData, outputData] = getDirData(rootDir, outputDir);
     expect(rootData).toEqual(outputData);
     expect(exitCode).toBe(0);