diff --git a/packages/toolkit/package.json b/packages/toolkit/package.json
index d1049ec59a..842dd7fd93 100644
--- a/packages/toolkit/package.json
+++ b/packages/toolkit/package.json
@@ -24,6 +24,21 @@
   },
   "main": "dist/index.js",
   "module": "dist/redux-toolkit.esm.js",
+  "exports": {
+    ".": {
+      "import": "./dist/redux-toolkit.esm.mjs",
+      "require": "./dist/index.js"
+    },
+    "./query": {
+      "import": "./dist/query/rtk-query.esm.mjs",
+      "require": "./dist/query/index.js"
+    },
+    "./query/react": {
+      "import": "./dist/query/react/rtk-query-react.esm.mjs",
+      "require": "./dist/query/react/index.js"
+    },
+    "./*": "./*"
+  },
   "unpkg": "dist/redux-toolkit.umd.min.js",
   "types": "dist/index.d.ts",
   "devDependencies": {
diff --git a/packages/toolkit/scripts/build.ts b/packages/toolkit/scripts/build.ts
index d36a1d1cc0..8744726921 100644
--- a/packages/toolkit/scripts/build.ts
+++ b/packages/toolkit/scripts/build.ts
@@ -53,6 +53,14 @@ const buildTargets: BuildOptions[] = [
     minify: false,
     env: '',
   },
+  // ESM, embedded `process`, ES5 syntax: typical Webpack dev, mjs extension
+  {
+    format: 'esm',
+    name: 'esm',
+    minify: false,
+    env: '',
+    extension: 'mjs',
+  },
   // ESM, embedded `process`, ES2017 syntax: modern Webpack dev
   {
     format: 'esm',
@@ -134,10 +142,11 @@ async function bundle(options: BuildOptions & EntryPointOptions) {
     name,
     target = 'es2015',
     entryPoint,
+    extension = 'js',
   } = options
 
   const outputFolder = path.join('dist', folder)
-  const outputFilename = `${prefix}.${name}.js`
+  const outputFilename = `${prefix}.${name}.${extension}`
   const outputFilePath = path.join(outputFolder, outputFilename)
 
   const result = await build({
diff --git a/packages/toolkit/scripts/types.ts b/packages/toolkit/scripts/types.ts
index 31f2fbe9b9..baf6de74cc 100644
--- a/packages/toolkit/scripts/types.ts
+++ b/packages/toolkit/scripts/types.ts
@@ -12,6 +12,7 @@ export interface BuildOptions {
   minify: boolean
   env: 'development' | 'production' | ''
   target?: 'es2017'
+  extension?: 'js' | 'mjs'
 }
 
 export interface EntryPointOptions {