diff --git a/packages/logger/jest.config.cjs b/packages/logger/jest.config.cjs
index deb2a416a5..f711f79a2c 100644
--- a/packages/logger/jest.config.cjs
+++ b/packages/logger/jest.config.cjs
@@ -8,7 +8,12 @@ module.exports = {
     '^(\\.{1,2}/.*)\\.js$': '$1',
   },
   transform: {
-    '^.+\\.ts?$': 'ts-jest',
+    '^.+\\.[tj]sx?$': [
+      'ts-jest',
+      {
+        useESM: true,
+      },
+    ],
   },
   moduleFileExtensions: ['js', 'ts'],
   collectCoverageFrom: ['**/src/**/*.ts', '!**/node_modules/**'],
diff --git a/packages/logger/package.json b/packages/logger/package.json
index 136f6760ed..7da74efebb 100644
--- a/packages/logger/package.json
+++ b/packages/logger/package.json
@@ -100,4 +100,4 @@
     "serverless",
     "nodejs"
   ]
-}
\ No newline at end of file
+}
diff --git a/packages/logger/src/formatter/LogFormatterInterface.ts b/packages/logger/src/formatter/LogFormatterInterface.ts
index 0fe1dd9909..49d35154c3 100644
--- a/packages/logger/src/formatter/LogFormatterInterface.ts
+++ b/packages/logger/src/formatter/LogFormatterInterface.ts
@@ -1,5 +1,6 @@
-import { LogAttributes, UnformattedAttributes } from '../types';
-import { LogItem } from '../log';
+import { LogAttributes } from '../types/Log.js';
+import { UnformattedAttributes } from '../types/Logger.js';
+import { LogItem } from '../log/LogItem.js';
 
 /**
  * @interface
diff --git a/packages/logger/src/formatter/index.ts b/packages/logger/src/formatter/index.ts
deleted file mode 100644
index ef5d7b16d8..0000000000
--- a/packages/logger/src/formatter/index.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export * from './LogFormatter';
-export * from './LogFormatterInterface';
-export * from './PowertoolsLogFormatter';
diff --git a/packages/logger/src/log/LogItemInterface.ts b/packages/logger/src/log/LogItemInterface.ts
new file mode 100644
index 0000000000..ed0c89bb0b
--- /dev/null
+++ b/packages/logger/src/log/LogItemInterface.ts
@@ -0,0 +1,9 @@
+import { LogAttributes } from '../types/Log.js';
+
+interface LogItemInterface {
+  addAttributes(attributes: LogAttributes): void;
+
+  getAttributes(): LogAttributes;
+}
+
+export { LogItemInterface };
diff --git a/packages/logger/src/types/formats/PowertoolsLog.ts b/packages/logger/src/types/formats/PowertoolsLog.ts
index fa360fef59..9406a2a5fe 100644
--- a/packages/logger/src/types/formats/PowertoolsLog.ts
+++ b/packages/logger/src/types/formats/PowertoolsLog.ts
@@ -1,4 +1,4 @@
-import type { LogAttributes, LogLevel } from '..';
+import type { LogAttributes, LogLevel } from '../Log.js';
 
 type PowertoolsLog = LogAttributes & {
   /**
diff --git a/packages/logger/src/types/formats/index.ts b/packages/logger/src/types/formats/index.ts
index 5a828a385f..03dabd2013 100644
--- a/packages/logger/src/types/formats/index.ts
+++ b/packages/logger/src/types/formats/index.ts
@@ -1 +1 @@
-export * from './PowertoolsLog';
+export type { PowertoolsLog } from './PowertoolsLog.js';