diff --git a/.gitignore b/.gitignore
index c2658d7..a5199f6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 node_modules/
+.idea
\ No newline at end of file
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..b774eb9
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,87 @@
+import {EventEmitter} from "events";
+
+export interface BackoffStrategyOptions {
+    initialDelay?: number;
+    maxDelay?: number;
+    randomisationFactor?: number
+}
+
+abstract class BackoffStrategy {
+    constructor(options?: BackoffStrategyOptions)
+
+    getMaxDelay(): number;
+
+    getInitialDelay(): number;
+
+    next();
+
+    reset();
+}
+
+export class FibonacciStrategy extends BackoffStrategy {
+
+}
+
+export interface ExponentialStrategyOptions extends BackoffStrategyOptions {
+    factor?: number
+}
+
+export class ExponentialStrategy extends BackoffStrategy {
+    constructor(options?: ExponentialStrategyOptions);
+
+    public static DEFAULT_FACTOR: number;
+}
+
+export class Backoff extends EventEmitter {
+    constructor(backoffStrategy: BackoffStrategy);
+
+    failAfter(maxNumberOfRetry: number);
+
+    backoff(err?: Error);
+
+    reset();
+}
+
+
+export class FunctionCall extends EventEmitter {
+
+    constructor(fn: Function, args: any[], callback: Function);
+
+    isPending(): boolean;
+
+    isRunning(): boolean;
+
+    isCompleted(): boolean;
+
+    isAborted(): boolean;
+
+    setStrategy(strategy: BackoffStrategy): this;
+
+    retryIf(retryPredicate: (err: Error) => boolean): this;
+
+    getLastResult(): any;
+
+    getNumRetries(): number;
+
+    failAfter(maxNumberOfRetry: number): this;
+
+    abort();
+
+    start(backoffFactory?: (strategy: BackoffStrategy) => Backoff);
+}
+
+export function fibonacci(options?: BackoffStrategyOptions): Backoff;
+
+export function exponential(options?: ExponentialStrategyOptions): Backoff;
+
+// Have to be done that way until this gets solved https://github.com/Microsoft/TypeScript/issues/1360
+export function call(fn: Function, arg1: any, callback: Function): FunctionCall;
+export function call(fn: Function, arg1: any, arg2: any, callback: Function): FunctionCall;
+export function call(fn: Function, arg1: any, arg2: any, arg3: any, callback: Function): FunctionCall;
+export function call(fn: Function, arg1: any, arg2: any, arg3: any, arg4: any, callback: Function): FunctionCall;
+export function call(fn: Function, arg1: any, arg2: any, arg3: any, arg4: any, arg5: any, callback: Function): FunctionCall;
+export function call(fn: Function, arg1: any, arg2: any, arg3: any, arg4: any, arg5: any, arg6: any, callback: Function): FunctionCall;
+export function call(fn: Function, arg1: any, arg2: any, arg3: any, arg4: any, arg5: any, arg6: any, arg7: any, callback: Function): FunctionCall;
+export function call(fn: Function, arg1: any, arg2: any, arg3: any, arg4: any, arg5: any, arg6: any, arg7: any, arg8: any, callback: Function): FunctionCall;
+export function call(fn: Function, arg1: any, arg2: any, arg3: any, arg4: any, arg5: any, arg6: any, arg7: any, arg8: any, arg9: any, callback: Function): FunctionCall;
+export function call(fn: Function, arg1: any, arg2: any, arg3: any, arg4: any, arg5: any, arg6: any, arg7: any, arg8: any, arg9: any, arg10: any, callback: Function): FunctionCall;
\ No newline at end of file
diff --git a/package.json b/package.json
index b6d6cb6..fb73119 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,8 @@
     },
     "devDependencies": {
         "sinon": "1.10",
-        "nodeunit": "0.9"
+        "nodeunit": "0.9",
+        "@types/node": "^7.0.12"
     },
     "scripts": {
         "docco" : "docco lib/*.js lib/strategy/* index.js",