diff --git a/docs/Changelog.mdx b/docs/Changelog.mdx
index 899c694..f731c8b 100644
--- a/docs/Changelog.mdx
+++ b/docs/Changelog.mdx
@@ -10,6 +10,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.0.3] - 2020-06-30
+- esm bundle
+
 ## [1.0.2] - 2020-06-25
 - change react peer dependency format
 
diff --git a/package.json b/package.json
index 20eb658..82a2b6d 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,10 @@
 {
   "name": "react-type-check",
-  "version": "1.0.3-rc.2",
+  "version": "1.0.3",
   "description": "Type checking utilities for React elements.",
-  "main": "dist/index.js",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "module": "./dist/react-type-check.esm.js",
   "files": [
     "dist"
   ],
@@ -12,7 +14,7 @@
   "scripts": {
     "prebuild": "rimraf dist",
     "prepublishOnly": "concurrently \"yarn run build\" \"yarn run validate\"",
-    "build": "tsc",
+    "build": "rollup -c",
     "check-types": "tsc --noEmit",
     "test-types": "yarn run check-types --project ./testing/tsconfig.test.json",
     "test": "jest -c ./testing/jest.config.js",
@@ -43,6 +45,8 @@
     "prettier": "^2.0.5",
     "react": "^16.13.1",
     "rimraf": "^3.0.2",
+    "rollup": "^2.18.1",
+    "rollup-plugin-typescript2": "^0.27.1",
     "ts-jest": "^26.1.0",
     "typescript": "^3.9.3"
   },
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 0000000..ee80953
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,13 @@
+import pkg from './package.json';
+import typescript from 'rollup-plugin-typescript2';
+export default {
+  input: 'src/index.ts',
+  output: [
+    {
+      file: pkg.main,
+      format: 'cjs',
+    },
+    { file: pkg.module, format: 'es' },
+  ],
+  plugins: [typescript()],
+};
diff --git a/tsconfig.json b/tsconfig.json
index db51b84..9454fbd 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -5,7 +5,7 @@
     /* Basic Options */
     // "incremental": true,                   /* Enable incremental compilation */
     "target": "es5" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */,
-    "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */,
+    "module": "es2015" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */,
     // "lib": [],                             /* Specify library files to be included in the compilation. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
     // "checkJs": true,                       /* Report errors in .js files. */
@@ -14,7 +14,7 @@
     // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
     // "sourceMap": true,                     /* Generates corresponding '.map' file. */
     // "outFile": "./",                       /* Concatenate and emit output to single file. */
-    "outDir": "./dist" /* Redirect output structure to the directory. */,
+    // "outDir": "./dist" /* Redirect output structure to the directory. */,
     "rootDir": "./src" /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */,
     // "composite": true,                     /* Enable project compilation */
     // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
diff --git a/yarn.lock b/yarn.lock
index fabd452..79ebe20 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1857,6 +1857,15 @@
   dependencies:
     tslib "^1.11.2"
 
+"@rollup/pluginutils@^3.0.8":
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/@rollup/pluginutils/-/pluginutils-3.1.0.tgz#706b4524ee6dc8b103b3c995533e5ad680c02b9b"
+  integrity sha512-GksZ6pr6TpIjHm8h9lSQ8pi8BE9VeubNT0OMJ3B5uZJ8pz73NPiqOtCog/x2/QzM1ENChPKxMDhiQuRHsqc+lg==
+  dependencies:
+    "@types/estree" "0.0.39"
+    estree-walker "^1.0.1"
+    picomatch "^2.2.2"
+
 "@samverschueren/stream-to-observable@^0.3.0":
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/@samverschueren/stream-to-observable/-/stream-to-observable-0.3.0.tgz#ecdf48d532c58ea477acfcab80348424f8d0662f"
@@ -2121,6 +2130,11 @@
   resolved "https://registry.yarnpkg.com/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz#1ee30d79544ca84d68d4b3cdb0af4f205663dd2d"
   integrity sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==
 
+"@types/estree@0.0.39":
+  version "0.0.39"
+  resolved "https://registry.yarnpkg.com/@types/estree/-/estree-0.0.39.tgz#e177e699ee1b8c22d23174caaa7422644389509f"
+  integrity sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw==
+
 "@types/events@*":
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/@types/events/-/events-3.0.0.tgz#2862f3f58a9a7f7c3e78d79f130dd4d71c25c2a7"
@@ -6366,6 +6380,11 @@ estraverse@^5.1.0:
   resolved "https://registry.yarnpkg.com/estraverse/-/estraverse-5.1.0.tgz#374309d39fd935ae500e7b92e8a6b4c720e59642"
   integrity sha512-FyohXK+R0vE+y1nHLoBM7ZTyqRpqAlhdZHCWIWEviFLiGB8b04H6bQs8G+XTthacvT8VuwvteiP7RJSxMs8UEw==
 
+estree-walker@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/estree-walker/-/estree-walker-1.0.1.tgz#31bc5d612c96b704106b477e6dd5d8aa138cb700"
+  integrity sha512-1fMXF3YP4pZZVozF8j/ZLfvnR8NSIljt56UhbZ5PeeDmmGHpgpdwQt7ITlGvYaQukCvuBRMLEiKiYC+oeIg4cg==
+
 esutils@^2.0.2:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.3.tgz#74d2eb4de0b8da1293711910d50775b9b710ef64"
@@ -6894,6 +6913,15 @@ find-cache-dir@^2.0.0, find-cache-dir@^2.1.0:
     make-dir "^2.0.0"
     pkg-dir "^3.0.0"
 
+find-cache-dir@^3.3.1:
+  version "3.3.1"
+  resolved "https://registry.yarnpkg.com/find-cache-dir/-/find-cache-dir-3.3.1.tgz#89b33fad4a4670daa94f855f7fbe31d6d84fe880"
+  integrity sha512-t2GDMt3oGC/v+BMwzmllWDuJF/xcDtE5j/fCGbqDD7OLuJkj0cfh1YSA5VKPvwMeLFLNDBkwOKZ2X85jGLVftQ==
+  dependencies:
+    commondir "^1.0.1"
+    make-dir "^3.0.2"
+    pkg-dir "^4.1.0"
+
 find-root@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/find-root/-/find-root-1.1.0.tgz#abcfc8ba76f708c42a97b3d685b7e9450bfb9ce4"
@@ -7066,6 +7094,15 @@ fs-exists-cached@1.0.0, fs-exists-cached@^1.0.0:
   resolved "https://registry.yarnpkg.com/fs-exists-cached/-/fs-exists-cached-1.0.0.tgz#cf25554ca050dc49ae6656b41de42258989dcbce"
   integrity sha1-zyVVTKBQ3EmuZla0HeQiWJidy84=
 
+fs-extra@8.1.0, fs-extra@^8.1.0:
+  version "8.1.0"
+  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-8.1.0.tgz#49d43c45a88cd9677668cb7be1b46efdb8d2e1c0"
+  integrity sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==
+  dependencies:
+    graceful-fs "^4.2.0"
+    jsonfile "^4.0.0"
+    universalify "^0.1.0"
+
 fs-extra@9.0.1:
   version "9.0.1"
   resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-9.0.1.tgz#910da0062437ba4c39fedd863f1675ccfefcb9fc"
@@ -7076,15 +7113,6 @@ fs-extra@9.0.1:
     jsonfile "^6.0.1"
     universalify "^1.0.0"
 
-fs-extra@^8.1.0:
-  version "8.1.0"
-  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-8.1.0.tgz#49d43c45a88cd9677668cb7be1b46efdb8d2e1c0"
-  integrity sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==
-  dependencies:
-    graceful-fs "^4.2.0"
-    jsonfile "^4.0.0"
-    universalify "^0.1.0"
-
 fs-readdir-recursive@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/fs-readdir-recursive/-/fs-readdir-recursive-1.1.0.tgz#e32fc030a2ccee44a6b5371308da54be0b397d27"
@@ -10578,7 +10606,7 @@ make-dir@^2.0.0, make-dir@^2.1.0:
     pify "^4.0.1"
     semver "^5.6.0"
 
-make-dir@^3.0.0:
+make-dir@^3.0.0, make-dir@^3.0.2:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/make-dir/-/make-dir-3.1.0.tgz#415e967046b3a7f1d185277d84aa58203726a13f"
   integrity sha512-g3FeP20LNwhALb/6Cz6Dd4F2ngze0jz7tbzrD2wAV+o9FeNHe4rL+yK2md0J/fiSf1sa1ADhXqi5+oVwOM/eGw==
@@ -12059,7 +12087,7 @@ physical-cpu-count@^2.0.0:
   resolved "https://registry.yarnpkg.com/physical-cpu-count/-/physical-cpu-count-2.0.0.tgz#18de2f97e4bf7a9551ad7511942b5496f7aba660"
   integrity sha1-GN4vl+S/epVRrXURlCtUlverpmA=
 
-picomatch@^2.0.4, picomatch@^2.0.5, picomatch@^2.2.1:
+picomatch@^2.0.4, picomatch@^2.0.5, picomatch@^2.2.1, picomatch@^2.2.2:
   version "2.2.2"
   resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.2.2.tgz#21f333e9b6b8eaff02468f5146ea406d345f4dad"
   integrity sha512-q0M/9eZHzmr0AulXyPwNfZjtwZ/RBZlbN3K3CErVrk50T2ASYI7Bye0EvekFY3IP1Nt2DHu0re+V2ZHIpMkuWg==
@@ -12127,7 +12155,7 @@ pkg-dir@^3.0.0:
   dependencies:
     find-up "^3.0.0"
 
-pkg-dir@^4.2.0:
+pkg-dir@^4.1.0, pkg-dir@^4.2.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/pkg-dir/-/pkg-dir-4.2.0.tgz#f099133df7ede422e81d1d8448270eeb3e4261f3"
   integrity sha512-HRDzbaKjC+AOWVXxAU/x54COGeIv9eb+6CkDSQoNTt4XyWoIJvuPsXizxu/Fr23EiekbtZwmh1IcIG/l/a10GQ==
@@ -13834,6 +13862,13 @@ resolve-url@^0.2.1:
   resolved "https://registry.yarnpkg.com/resolve-url/-/resolve-url-0.2.1.tgz#2c637fe77c893afd2a663fe21aa9080068e2052a"
   integrity sha1-LGN/53yJOv0qZj/iGqkIAGjiBSo=
 
+resolve@1.15.1:
+  version "1.15.1"
+  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.15.1.tgz#27bdcdeffeaf2d6244b95bb0f9f4b4653451f3e8"
+  integrity sha512-84oo6ZTtoTUpjgNEr5SJyzQhzL72gaRodsSfyxC/AXRvwu0Yse9H8eF9IpGo7b8YetZhlI6v7ZQ6bKBFV/6S7w==
+  dependencies:
+    path-parse "^1.0.6"
+
 resolve@^1.1.6, resolve@^1.10.0, resolve@^1.11.1, resolve@^1.12.0, resolve@^1.13.1, resolve@^1.15.1, resolve@^1.17.0, resolve@^1.3.2, resolve@^1.8.1:
   version "1.17.0"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.17.0.tgz#b25941b54968231cc2d1bb76a79cb7f2c0bf8444"
@@ -13926,6 +13961,24 @@ ripemd160@^2.0.0, ripemd160@^2.0.1:
     hash-base "^3.0.0"
     inherits "^2.0.1"
 
+rollup-plugin-typescript2@^0.27.1:
+  version "0.27.1"
+  resolved "https://registry.yarnpkg.com/rollup-plugin-typescript2/-/rollup-plugin-typescript2-0.27.1.tgz#4f27193408a8f040139eed3e3db7b0c7f3668200"
+  integrity sha512-RJl77Bbj1EunAQDC3dK/O2HWuSUX3oJbRGzyLoS5o9W4Hs1Nix3Gavqj1Lzs5Y6Ff4H2xXfmZ1WWUQCYocSbzQ==
+  dependencies:
+    "@rollup/pluginutils" "^3.0.8"
+    find-cache-dir "^3.3.1"
+    fs-extra "8.1.0"
+    resolve "1.15.1"
+    tslib "1.11.2"
+
+rollup@^2.18.1:
+  version "2.18.1"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.18.1.tgz#1662c679da5dfc89ec6fda75951a2bcca1a4f77d"
+  integrity sha512-w4X77ADA+WTGlapC8Z6yggdJtODw3SBl6R2LSkA7ZW5MtdkgcB7sfaSD1UWyx8diXbMcGIb0eI9gCx/dyqOgNQ==
+  optionalDependencies:
+    fsevents "~2.1.2"
+
 rsvp@^4.8.4:
   version "4.8.5"
   resolved "https://registry.yarnpkg.com/rsvp/-/rsvp-4.8.5.tgz#c8f155311d167f68f21e168df71ec5b083113734"
@@ -15554,6 +15607,11 @@ tsconfig-paths@^3.9.0:
     minimist "^1.2.0"
     strip-bom "^3.0.0"
 
+tslib@1.11.2:
+  version "1.11.2"
+  resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.11.2.tgz#9c79d83272c9a7aaf166f73915c9667ecdde3cc9"
+  integrity sha512-tTSkux6IGPnUGUd1XAZHcpu85MOkIl5zX49pO+jfsie3eP0B6pyhOlLXm3cAC6T7s+euSDDUUV+Acop5WmtkVg==
+
 tslib@^1.0.0, tslib@^1.10.0, tslib@^1.11.1, tslib@^1.11.2, tslib@^1.8.1, tslib@^1.9.0, tslib@^1.9.3:
   version "1.13.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.13.0.tgz#c881e13cc7015894ed914862d276436fa9a47043"