diff --git a/.circleci/config.yml b/.circleci/config.yml
index e88633c..7fee990 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -30,13 +30,13 @@ jobs:
       - run: npm publish --dry-run
       - run: ls -al
       - run: pwd
-      - run: gzip -9 /root/project/dist/bnc-sdk.js
-      - run: mv /root/project/dist/bnc-sdk.js.gz /root/project/dist/bnc-sdk.js
+      - run: gzip -9 /root/project/dist/iife/index.js
+      - run: mv /root/project/dist/iife/index.js.gz /root/project/dist/iife/index.js
       - run: ls -al
       - run: echo export VERSION=`awk '/version/{gsub(/("|",)/,"",$2);print $2};' package.json | sed 's/\./-/g'` >> $BASH_ENV
       - run: mkdir /root/project/deploy-temp
       - run: mkdir /root/project/deploy-temp/${VERSION}
-      - run: mv /root/project/dist/*.js /root/project/deploy-temp/${VERSION}/
+      - run: mv /root/project/dist/iife/*.js /root/project/deploy-temp/${VERSION}/
       - run: aws s3 sync /root/project/deploy-temp/${VERSION}/ s3://staging.sdk.blocknative.com/${VERSION}/ --content-type "text/javascript" --content-encoding "gzip" --cache-control "max-age=31536000" --grants read=uri=http://acs.amazonaws.com/groups/global/AllUsers
   deploy_prod:
     docker:
@@ -50,13 +50,13 @@ jobs:
       - run: sudo npm i -g add npm-cli-login
       - run: NPM_USER=$NPM_USERNAME NPM_EMAIL=$NPM_EMAIL NPM_PASS=$NPM_PASSWORD npm-cli-login
       - run: npm publish
-      - run: gzip -9 /root/project/dist/bnc-sdk.js
-      - run: mv /root/project/dist/bnc-sdk.js.gz /root/project/dist/bnc-sdk.js
+      - run: gzip -9 /root/project/dist/iife/index.js
+      - run: mv /root/project/dist/iife/index.js.gz /root/project/dist/iife/index.js
       - run: ls -al
       - run: echo export VERSION=`awk '/version/{gsub(/("|",)/,"",$2);print $2};' package.json | sed 's/\./-/g'` >> $BASH_ENV
       - run: mkdir /root/project/deploy-temp
       - run: mkdir /root/project/deploy-temp/${VERSION}
-      - run: mv /root/project/dist/*.js /root/project/deploy-temp/${VERSION}/
+      - run: mv /root/project/dist/iife/*.js /root/project/deploy-temp/${VERSION}/
       - run: aws s3 sync /root/project/deploy-temp/${VERSION}/ s3://sdk.blocknative.com/${VERSION}/ --content-type "text/javascript" --content-encoding "gzip" --cache-control "max-age=31536000" --grants read=uri=http://acs.amazonaws.com/groups/global/AllUsers
 workflows:
   version: 2
diff --git a/.prettierrc b/.prettierrc
index 466499b..273b4d3 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -3,5 +3,6 @@
   "tabWidth": 2,
   "useTabs": false,
   "semi": false,
-  "singleQuote": true
+  "singleQuote": true,
+  "trailingComma": "none"
 }
diff --git a/package.json b/package.json
index cdb0e03..7280d28 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "bnc-sdk",
-  "version": "2.0.0",
+  "version": "2.0.1",
   "description": "SDK to connect to the blocknative backend via a websocket connection",
   "keywords": [
     "ethereum",
@@ -8,8 +8,8 @@
     "blocknative",
     "notifications"
   ],
-  "main": "dist/bnc-sdk.js",
-  "module": "dist/bnc-sdk.esm.js",
+  "main": "dist/cjs/index.js",
+  "module": "dist/esm/index.js",
   "typings": "dist/types/src/index.d.ts",
   "files": [
     "dist"
@@ -21,7 +21,7 @@
   },
   "license": "MIT",
   "scripts": {
-    "build": "rimraf dist && rollup -c && babel dist/bnc-sdk.esm.js -o dist/bnc-sdk.esm.js && babel dist/bnc-sdk.js -o dist/bnc-sdk.js",
+    "build": "rimraf dist && rollup -c && babel dist/esm/index.js -o dist/esm/index.js && babel dist/cjs/index.js -o dist/cjs/index.js",
     "test": "echo \"TBD\" && exit 0"
   },
   "devDependencies": {
diff --git a/rollup.config.js b/rollup.config.js
index e457808..4e742af 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -3,32 +3,50 @@ import json from '@rollup/plugin-json'
 import typescript from 'rollup-plugin-typescript2'
 import commonjs from '@rollup/plugin-commonjs'
 
-const pkg = require('./package.json')
-
 export default [
   {
     input: `src/index.ts`,
     output: {
-      file: pkg.main,
+      dir: 'dist/iife/',
+      format: 'iife',
       name: 'bncSdk',
-      format: 'umd',
-      globals: ['SturdyWebSocket']
+      globals: ['SturdyWebSocket', 'crypto-es'],
     },
     plugins: [
       json(),
       resolve(),
       commonjs(),
-      typescript({ useTsconfigDeclarationDir: true })
-    ]
+      typescript({ useTsconfigDeclarationDir: true, clean: true }),
+    ],
   },
   {
     input: `src/index.ts`,
-    output: { file: pkg.module, format: 'esm' },
+    output: [
+      {
+        format: 'esm',
+        dir: 'dist/esm/',
+      },
+    ],
     external: ['sturdy-websocket', 'crypto-es'],
     plugins: [
       json(),
       resolve(),
-      typescript({ useTsconfigDeclarationDir: true })
-    ]
-  }
+      typescript({ useTsconfigDeclarationDir: true, clean: true }),
+    ],
+  },
+  {
+    input: `src/index.ts`,
+    output: [
+      {
+        format: 'cjs',
+        dir: 'dist/cjs/',
+      },
+    ],
+    plugins: [
+      json(),
+      resolve(),
+      commonjs({ include: /node_modules/ }),
+      typescript({ useTsconfigDeclarationDir: true, clean: true }),
+    ],
+  },
 ]
diff --git a/src/interfaces.ts b/src/interfaces.ts
index 2a71415..2e96d73 100644
--- a/src/interfaces.ts
+++ b/src/interfaces.ts
@@ -43,7 +43,7 @@ export interface TransactionData {
 }
 
 export interface TransactionEvent {
-  emitterResult: undefined | boolean | NotificationObject
+  emitterResult: void | boolean | NotificationObject
   transaction: TransactionData
 }
 
@@ -61,7 +61,7 @@ export interface Emitter {
     [key: string]: EmitterListener
   }
   on: (eventCode: string, listener: EmitterListener) => void
-  emit: (state: TransactionData) => boolean | undefined | NotificationObject
+  emit: (state: TransactionData) => boolean | void | NotificationObject
 }
 
 export interface Ac {
@@ -109,7 +109,7 @@ export interface TransactionHandler {
 }
 
 export interface EmitterListener {
-  (state: TransactionData): boolean | undefined | NotificationObject
+  (state: TransactionData): boolean | undefined | NotificationObject | void
 }
 
 export interface Transaction {
diff --git a/tsconfig.json b/tsconfig.json
index 8117293..9924318 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,17 +1,14 @@
 {
   "compilerOptions": {
     "moduleResolution": "node",
-    "target": "es5",
-    "module": "es2015",
-    "lib": ["es2015", "es2016", "es2017", "dom"],
+    "target": "ESNEXT",
+    "module": "ESNEXT",
     "strict": true,
-    "sourceMap": true,
     "declaration": true,
     "allowSyntheticDefaultImports": true,
     "declarationDir": "dist/types",
-    "outDir": "dist/lib",
-    "typeRoots": ["node_modules/@types"],
+    "esModuleInterop": true,
     "resolveJsonModule": true
   },
-  "include": ["src"]
+  "include": ["src/**/*"]
 }