diff --git a/types/redux-api-middleware/index.d.ts b/types/redux-api-middleware/index.d.ts
new file mode 100644
index 0000000000..7c79fe9c9c
--- /dev/null
+++ b/types/redux-api-middleware/index.d.ts
@@ -0,0 +1,104 @@
+// Type definitions for redux-api-middleware 3.0
+// Project: https://github.com/agraboso/redux-api-middleware
+// Definitions by: Andrew Luca <https://github.com/me>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+import {
+    Middleware,
+    MiddlewareAPI,
+    Dispatch,
+    AnyAction,
+    applyMiddleware
+} from 'redux';
+
+/**
+ * This module is also a UMD module that exposes a global variable 'ReduxApiMiddleware'
+ * when loaded outside a module loader environment.
+ */
+export as namespace ReduxApiMiddleware;
+
+export type RSAA = '@@redux-api-middleware/RSAA';
+export const RSAA = '@@redux-api-middleware/RSAA';
+
+export function isRSAA(action: object): boolean;
+export function validateRSAA(action: object): string[];
+export function isValidRSAA(action: object): boolean;
+
+export class InvalidRSAA extends Error {
+    name: 'InvalidRSAA';
+    message: 'Invalid RSAA';
+    validationErrors: string[];
+    constructor(validationErrors: string[]);
+}
+
+export class InternalError extends Error {
+    name: 'InternalError';
+    message: string;
+    constructor(message: string);
+}
+
+export class RequestError extends Error {
+    name: 'RequestError';
+    message: string;
+    constructor(message: string);
+}
+
+export class ApiError<T extends object = any> extends Error {
+    name: 'ApiError';
+    status: number;
+    statusText: string;
+    response: T;
+    message: string;
+    constructor(status: number, statusText: string, response: T);
+}
+
+export function getJSON(res: Response): Promise<any> | Promise<void>;
+
+export const apiMiddleware: Middleware;
+
+export interface CreateMiddlewareOptions {
+    ok?: (res: Response) => boolean;
+    fetch?: typeof fetch;
+}
+
+export function createMiddleware(options?: CreateMiddlewareOptions): Middleware;
+
+export interface RSAARequestTypeDescriptor<S = any, P = any, M = any> {
+    type: string | symbol;
+    payload?: (action: RSAAAction, state: S) => P | P;
+    meta?: (action: RSAAAction, state: S) => M | M;
+}
+
+export interface RSAASuccessTypeDescriptor<S = any, P = any, M = any> {
+    type: string | symbol;
+    payload?: (action: RSAAAction, state: S, res: any) => P | P;
+    meta?: (action: RSAAAction, state: S, res: any) => M | M;
+}
+
+export interface RSAAFailureTypeDescriptor<S = any, P = any, M = any> {
+    type: string | symbol;
+    payload?: (action: RSAAAction, state: S) => P | P;
+    meta?: (action: RSAAAction, state: S, res: any) => M | M;
+}
+
+export interface RSAACall<S = any, P = any, M = any> {
+    endpoint: (state: S) => string | string;
+    method: string;
+    types: [
+        string | symbol | RSAARequestTypeDescriptor<S, P, M>,
+        string | symbol | RSAASuccessTypeDescriptor<S, P, M>,
+        string | symbol | RSAAFailureTypeDescriptor<S, P, M>
+    ];
+    body?: ((state: S) => BodyInit | null) | BodyInit | null;
+    headers?: (state: S) => HeadersInit | HeadersInit;
+    options?: (state: S) => RequestInit | RequestInit;
+    credentials?: RequestCredentials;
+    bailout?: (state: S) => boolean | boolean;
+    fetch?: typeof fetch;
+    ok?: (res: Response) => boolean;
+}
+
+export interface RSAAAction<S = any, P = any, M = any> {
+    [RSAA]: RSAACall<S, P, M>;
+}
diff --git a/types/redux-api-middleware/package.json b/types/redux-api-middleware/package.json
new file mode 100644
index 0000000000..7cc600c266
--- /dev/null
+++ b/types/redux-api-middleware/package.json
@@ -0,0 +1,6 @@
+{
+    "private": true,
+    "dependencies": {
+        "redux": "^4.0.1"
+    }
+}
diff --git a/types/redux-api-middleware/redux-api-middleware-tests.ts b/types/redux-api-middleware/redux-api-middleware-tests.ts
new file mode 100644
index 0000000000..ad9b7ef34b
--- /dev/null
+++ b/types/redux-api-middleware/redux-api-middleware-tests.ts
@@ -0,0 +1,105 @@
+import {
+    RSAA,
+    isRSAA,
+    validateRSAA,
+    isValidRSAA,
+    InvalidRSAA,
+    InternalError,
+    RequestError,
+    ApiError,
+    getJSON,
+    createMiddleware,
+    apiMiddleware,
+} from 'redux-api-middleware';
+
+{
+    // RSAA
+    const passRSAA: RSAA = '@@redux-api-middleware/RSAA';
+    const failRSAA: RSAA = '@@redux-api-middleware/RSAA-fail'; // $ExpectError
+}
+
+{
+    // isRSAA
+    isRSAA({}); // $ExpectType boolean
+    isRSAA(); // $ExpectError
+}
+
+{
+    // validateRSAA
+    validateRSAA({}); // $ExpectType string[]
+    validateRSAA(); // $ExpectError
+}
+
+{
+    // isValidRSAA
+    isValidRSAA({}); // $ExpectType boolean
+    isValidRSAA(); // $ExpectError
+}
+
+{
+    // InvalidRSAA
+    new InvalidRSAA([]); // $ExpectType InvalidRSAA
+    new InvalidRSAA([]).message; // $ExpectType "Invalid RSAA"
+    new InvalidRSAA([]).name; // $ExpectType "InvalidRSAA"
+    new InvalidRSAA([]).validationErrors; // $ExpectType string[]
+    new InvalidRSAA(['']);
+    new InvalidRSAA(); // $ExpectError
+    new InvalidRSAA([0]); // $ExpectError
+}
+
+{
+    // InternalError
+    new InternalError(''); // $ExpectType InternalError
+    new InternalError('').name; // $ExpectType "InternalError"
+    new InternalError(); // $ExpectError
+    new InternalError(0); // $ExpectError
+}
+
+{
+    // RequestError
+    new RequestError(''); // $ExpectType RequestError
+    new RequestError('').name; // $ExpectType "RequestError"
+    new RequestError(); // $ExpectError
+    new RequestError(0); // $ExpectError
+}
+
+{
+    // ApiError
+    new ApiError(200, 'OK', {}); // $ExpectType ApiError<{}>
+    new ApiError(200, 'OK', {}).name; // $ExpectType "ApiError"
+    new ApiError(200, 'OK', {}).status; // $ExpectType number
+    new ApiError(200, 'OK', {}).statusText; // $ExpectType string
+    new ApiError(200, 'OK', {}).response; // $ExpectType {}
+    new ApiError(); // $ExpectError
+
+    interface Response { data: number; }
+    new ApiError<Response>(200, 'OK', { data: 0 }); // $ExpectType ApiError<Response>
+    new ApiError<Response>(200, 'OK', { data: 0 }).name; // $ExpectType "ApiError"
+    new ApiError<Response>(200, 'OK', { data: 0 }).status; // $ExpectType number
+    new ApiError<Response>(200, 'OK', { data: 0 }).statusText; // $ExpectType string
+    new ApiError<Response>(200, 'OK', { data: 0 }).response; // $ExpectType Response
+    new ApiError<Response>(200, 'OK', {}); // $ExpectError
+}
+
+{
+    // getJSON
+    getJSON(new Response()); // $ExpectType Promise<any> | Promise<void>
+    getJSON(); // $ExpectError
+    getJSON(0); // $ExpectError
+}
+
+{
+    // createMiddleware
+    createMiddleware(); // $ExpectType Middleware<{}, any, Dispatch<AnyAction>>
+    createMiddleware({}); // $ExpectType Middleware<{}, any, Dispatch<AnyAction>>
+    createMiddleware({ fetch }); // $ExpectType Middleware<{}, any, Dispatch<AnyAction>>
+    createMiddleware({ ok: res => res.ok }); // $ExpectType Middleware<{}, any, Dispatch<AnyAction>>
+    createMiddleware({ fetch, ok: res => res.ok }); // $ExpectType Middleware<{}, any, Dispatch<AnyAction>>
+}
+
+{
+    // apiMiddleware
+    // $ExpectType (next: Dispatch<AnyAction>) => (action: any) => any
+    apiMiddleware({ getState: () => undefined, dispatch: (action: any) => action });
+    apiMiddleware(); // $ExpectError
+}
diff --git a/types/redux-api-middleware/tsconfig.json b/types/redux-api-middleware/tsconfig.json
new file mode 100644
index 0000000000..f875313961
--- /dev/null
+++ b/types/redux-api-middleware/tsconfig.json
@@ -0,0 +1,24 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "redux-api-middleware-tests.ts"
+    ]
+}
diff --git a/types/redux-api-middleware/tslint.json b/types/redux-api-middleware/tslint.json
new file mode 100644
index 0000000000..f93cf8562a
--- /dev/null
+++ b/types/redux-api-middleware/tslint.json
@@ -0,0 +1,3 @@
+{
+    "extends": "dtslint/dt.json"
+}