diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index fb3893c8..83dd5328 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -31,6 +31,9 @@ jobs:
     - name: Build
       run: |
         npm run build
+    - name: Integration
+      run: |
+        npm run e2e
     - name: Deploy
       if: matrix.node-version == '12.x' && github.ref == 'refs/heads/master'
       env:
diff --git a/jest.e2e.config.json b/jest.e2e.config.json
new file mode 100644
index 00000000..b66265d2
--- /dev/null
+++ b/jest.e2e.config.json
@@ -0,0 +1,12 @@
+{
+  "preset": "ts-jest",
+  "moduleDirectories": ["./node_modules", "<rootDir>/node_modules", "."],
+  "moduleNameMapper": {
+    "src(.*)": "<rootDir>/dist$1"
+  },
+  "testPathIgnorePatterns": [
+    "./artifacts/",
+    "./dist/",
+    "./node_modules/"
+  ]
+}
diff --git a/package.json b/package.json
index eae48261..00dcd7a3 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,7 @@
         "clean": "rm -rf ./dist",
         "commit": "git-cz",
         "dedupe": "npm dedupe",
+        "e2e": "jest -c ./jest.e2e.config.json tests/index",
         "lint": "eslint . --max-warnings=0 --ext .js,.jsx,.ts,.tsx",
         "release": "semantic-release",
         "test": "jest",
@@ -57,7 +58,8 @@
         "coverageDirectory": "./artifacts/coverage",
         "coveragePathIgnorePatterns": [
             "<rootDir>/node_modules",
-            "<rootDir>/tests"
+            "<rootDir>/tests",
+            "<rootDir>/e2e"
         ],
         "testPathIgnorePatterns": [
             "./artifacts/",
diff --git a/src/createAction.ts b/src/createAction.ts
index 375330dc..3057fc19 100644
--- a/src/createAction.ts
+++ b/src/createAction.ts
@@ -2,7 +2,7 @@ export function createAction<T extends string, P, S>(
     type: T,
     prepare = (payload?: P): Partial<Action<T, P>> => ({ payload }),
 ): ActionCreator<T, P, S> {
-    return function createAction(payload): Action<T, P> {
+    return function createAction(payload) {
         const partialAction = prepare(payload);
         return { ...partialAction, type };
     };
diff --git a/src/createContext.ts b/src/createContext.ts
index a2f99603..9bfd8f87 100644
--- a/src/createContext.ts
+++ b/src/createContext.ts
@@ -5,7 +5,7 @@ import { setGlobalContext } from "./components/Context";
 function createUnimplemented(objectName?: string): (m: string) => () => never {
     const prefix = objectName ? `${objectName}.` : "";
     return function createUnimplemented(methodName) {
-        return function unimplemented(): never {
+        return function unimplemented() {
             throw new Error(`Unimplemented method: ${prefix}${methodName}`);
         };
     };
diff --git a/src/createReducer.ts b/src/createReducer.ts
index 9558dce4..a6bc38e3 100644
--- a/src/createReducer.ts
+++ b/src/createReducer.ts
@@ -11,7 +11,7 @@ export function createReducer<
         a !== undefined &&
         Object.prototype.hasOwnProperty.call(actionTypeToReducer, a.type);
 
-    return function actionReducer(state = initialState, action?): S {
+    return function actionReducer(state = initialState, action?) {
         if (!isReducerActionType(action)) {
             return defaultReducer?.(state, action) ?? state;
         }
diff --git a/src/utils/actionTypes.ts b/src/utils/actionTypes.ts
index 8bf7290f..94b59d5c 100644
--- a/src/utils/actionTypes.ts
+++ b/src/utils/actionTypes.ts
@@ -1,6 +1,5 @@
-const randomString = (): string => Math.random().toString(36).substring(7);
-const ns = (s: TemplateStringsArray): string =>
-    `@@context/${s}/${randomString()}`;
+const randomString = () => Math.random().toString(36).substring(7);
+const ns = (s: TemplateStringsArray) => `@@context/${s}/${randomString()}`;
 
 export const ActionTypes = {
     INIT: ns`INIT`,
diff --git a/src/utils/applyMiddleware.ts b/src/utils/applyMiddleware.ts
index 9ca91bf8..202be98d 100644
--- a/src/utils/applyMiddleware.ts
+++ b/src/utils/applyMiddleware.ts
@@ -4,9 +4,7 @@ import { compose } from "./compose";
 export function applyMiddleware<S, T extends string, P>(
     ...middlewares: Middleware<S, T, P>[]
 ): ContextEnhance<S, T, P> {
-    return function enhancer(
-        context: ContextValue<S, T, P>,
-    ): ContextValue<S, T, P> {
+    return function enhancer(context: ContextValue<S, T, P>) {
         // eslint-disable-next-line @typescript-eslint/no-unused-vars
         function dispatchStub(...args: unknown[]): never {
             throw new Error(
diff --git a/src/utils/combineReducers.ts b/src/utils/combineReducers.ts
index 27a988b5..e95973ce 100644
--- a/src/utils/combineReducers.ts
+++ b/src/utils/combineReducers.ts
@@ -5,10 +5,7 @@ export function combineReducers<S, N extends string, T extends string, P>(
     reducerMapping: DuckReducerMapping<S, N, T, P>,
 ): Reducer<Record<N, S>, T, P> {
     const reducers = getEntries(reducerMapping);
-    return function (
-        state: Record<N, S> = initialState,
-        action,
-    ): Record<string, S> {
+    return function (state: Record<N, S> = initialState, action) {
         return reducers.reduce(function reduce(acc, [name, reducer]) {
             acc[name] = reducer(state[name], action);
             return acc;
diff --git a/src/utils/combineSelectors.ts b/src/utils/combineSelectors.ts
index e19d9eb1..0e788341 100644
--- a/src/utils/combineSelectors.ts
+++ b/src/utils/combineSelectors.ts
@@ -12,7 +12,7 @@ export function combineSelectors<
     if (!selectors) return;
     const duckSelectors = {} as SelectorMapping<S, R, T, P, Q>;
     for (const s of Object.keys(selectors) as Q[]) {
-        duckSelectors[s] = (state: S): R =>
+        duckSelectors[s] = (state) =>
             selectors[s](((state as unknown) as Record<string, S>)[duckName]);
     }
     return duckSelectors;
diff --git a/src/utils/polyfillSymbol.ts b/src/utils/polyfillSymbol.ts
index c353f77c..f741b0c6 100644
--- a/src/utils/polyfillSymbol.ts
+++ b/src/utils/polyfillSymbol.ts
@@ -1,4 +1,4 @@
-function polyfillSymbol(name: string): void {
+function polyfillSymbol(name: string) {
     if (!Symbol[name]) {
         Object.defineProperty(Symbol, name, { value: Symbol(name) });
     }
diff --git a/tests/hooks.test.ts b/tests/hooks.test.ts
index 8b85ec03..1b8392a2 100644
--- a/tests/hooks.test.ts
+++ b/tests/hooks.test.ts
@@ -5,8 +5,8 @@ import { useObservable } from "src/hooks/useObservable";
 
 describe("useDispatch", () => {
     const mockValue = {
-        dispatch: async (a: Action<string, string>): Promise<typeof a> => a,
-        reducer: (): null => null,
+        dispatch: async (a: Action<string, string>) => a,
+        reducer: () => null,
         state: null,
         subscribe: () => ({ closed: true, unsubscribe: () => undefined }),
     };
diff --git a/tests/index.mock.tsx b/tests/index.mock.tsx
index db00faa8..253b020e 100644
--- a/tests/index.mock.tsx
+++ b/tests/index.mock.tsx
@@ -16,12 +16,12 @@ export function createMocks() {
         Record<string, unknown>,
         string,
         unknown
-    > = () => (next) => (action): Promise<typeof action> => next(action);
+    > = () => (next) => (action) => next(action);
 
     const DECREMENT = "decrement";
     const INCREMENT = "increment";
-    const decrement = (state: number): number => state - 1;
-    const increment = jest.fn((state): number => state + 1);
+    const decrement = (state: number) => state - 1;
+    const increment = jest.fn((state: number) => state + 1);
     const counterReducer: (s: number, a?: Action<string>) => number = (
         state,
         action,
@@ -39,17 +39,17 @@ export function createMocks() {
         initialState: 0,
         name: "counter",
         reducers: { [DECREMENT]: counterReducer, [INCREMENT]: counterReducer },
-        selectors: { get: (state): number => state },
+        selectors: { get: (state) => state },
     });
 
     const INIT = "init";
-    const init = jest.fn((): boolean => true);
+    const init = jest.fn(() => true);
     const initDuck = createDuck({
         actionMapping: { [ActionTypes.INIT]: INIT },
         initialState: false,
         name: "init",
         reducers: { [INIT]: init },
-        selectors: { get: (state): boolean => state },
+        selectors: { get: (state) => state },
     });
 
     const dummyDuck = createDuck({
@@ -70,7 +70,7 @@ export function createMocks() {
 
     const RootProvider = createRootProvider(Context);
 
-    function Example(): React.ReactElement {
+    function Example() {
         const increment = useDispatch(counterDuck.actions.increment);
         const init = useSelector(rootDuck.selectors.init?.get);
         const count = useSelector(rootDuck.selectors.counter?.get, Context);
@@ -86,7 +86,7 @@ export function createMocks() {
 
     const logger: Middleware<Record<string, unknown>, string, unknown> = ({
         getState,
-    }) => (next) => async (action): Promise<typeof action> => {
+    }) => (next) => async (action) => {
         // eslint-disable-next-line no-console
         console.log("action to dispatch", action);
         // Call the next dispatch method in the middleware chain.
@@ -110,7 +110,7 @@ export function createMocks() {
         unknown
     > = ({ dispatch }) => {
         dispatch({ type: "SOME_ACTION" });
-        return () => async (action): Promise<typeof action> => action;
+        return () => async (action) => action;
     };
     const emptyRootDuck = createRootDuck();
     const ErrorContext = createContext(
diff --git a/tests/index.test.tsx b/tests/index.test.tsx
index f9ee7265..5ff01215 100644
--- a/tests/index.test.tsx
+++ b/tests/index.test.tsx
@@ -11,10 +11,9 @@ import {
 } from "src";
 import { bindActionCreators } from "src/utils/bindActionCreators";
 import { connect } from "src/utils/connect";
-// eslint-disable-next-line jest/no-mocks-import
 import { createMocks } from "./index.mock";
 
-describe("integration", (): void => {
+describe("integration", () => {
     const {
         EnhancedContext,
         ErrorContext,
@@ -112,9 +111,8 @@ describe("integration", (): void => {
 
     describe("createConnect", () => {
         const mapStateToProps = createStructuredSelector({
-            count: rootDuck.selectors.counter?.get ?? ((): number => 0),
-            isInitialised:
-                rootDuck.selectors.init?.get ?? ((): boolean => false),
+            count: rootDuck.selectors.counter?.get ?? (() => 0),
+            isInitialised: rootDuck.selectors.init?.get ?? (() => false),
         });
         const mapDispatchToProps = {
             increment: rootDuck.actions.counter.increment,
@@ -262,7 +260,7 @@ describe("integration", (): void => {
 
         it("forwards ref to wrapped component", async () => {
             class ClassComponent extends React.PureComponent {
-                render(): React.ReactElement {
+                render() {
                     return <div></div>;
                 }
             }
@@ -288,7 +286,7 @@ describe("integration", (): void => {
                 .spyOn(console, "error")
                 .mockImplementationOnce(() => undefined);
             class ClassComponent extends React.PureComponent {
-                render(): React.ReactElement {
+                render() {
                     return <div></div>;
                 }
             }
@@ -318,7 +316,7 @@ describe("integration", (): void => {
 
     describe("contextSubscribe", () => {
         const listener = jest.fn();
-        function Sample(): React.ReactElement {
+        function Sample() {
             const value = React.useContext(GlobalContext);
             React.useEffect(
                 function contextSubscribe() {
diff --git a/tsconfig.prod.json b/tsconfig.prod.json
index 95d5accc..a3e05c83 100644
--- a/tsconfig.prod.json
+++ b/tsconfig.prod.json
@@ -1,4 +1,4 @@
 {
     "extends": "./tsconfig.json",
-    "exclude": ["node_modules", "dist", "tests"]
+    "exclude": ["node_modules", "dist", "tests", "e2e"]
 }