diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..30c2083
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,112 @@
+/** Changes the return type of a function to `any`. */
+type ReturningAny<T extends (...args: any[]) => any> = (...a: Parameters<T>) => any;
+
+/** @see {@link https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/node/globals.d.ts|Process.on()} */
+type ProcessEventOrSignal =
+  NodeJS.Signals
+  | 'beforeExit'
+  | 'disconnect'
+  | 'exit'
+  | 'rejectionHandled'
+  | 'uncaughtException'
+  | 'unhandledRejection'
+  | 'warning'
+  | 'message'
+  | 'newListener'
+  | 'removeListener'
+  | 'multipleResolves';
+
+declare namespace AsyncExitHook {
+
+  /** The callback to call when the event handling is finished. */
+  type AsycHookCallback = () => void;
+
+  /** Async hook called for uncaught exceptions or unhandled rejections. Call the callback when finished. */
+  type AsyncErrorHook = (err: Error | any, stepTowardExit: AsycHookCallback) => void;
+
+  /** Async hook. Call the callback when finished. */
+  type AsyncHook = (stepTowardExit: AsycHookCallback) => void;
+
+  /** Sync hook called for uncaught exception or unhandled rejection. */
+  type SyncErrorHook = (err: Error | any) => void;
+
+  /** Sync hook. */
+  type SyncHook = () => void;
+
+  /** @see {@link https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/node/globals.d.ts|Process.on()} */
+  interface HookEventFunction {
+    (event: 'beforeExit', code?: number | null, filter?: ReturningAny<NodeJS.BeforeExitListener>): void;
+
+    (event: 'disconnect', code?: number | null, filter?: ReturningAny<NodeJS.DisconnectListener>): void;
+
+    (event: 'exit', code?: number | null, filter?: ReturningAny<NodeJS.ExitListener>): void;
+
+    (event: 'rejectionHandled', code?: number | null, filter?: ReturningAny<NodeJS.RejectionHandledListener>): void;
+
+    (event: 'uncaughtException', code?: number | null, filter?: ReturningAny<NodeJS.UncaughtExceptionListener>): void;
+
+    (event: 'unhandledRejection', code?: number | null, filter?: ReturningAny<NodeJS.UnhandledRejectionListener>): void;
+
+    (event: 'warning', code?: number | null, filter?: ReturningAny<NodeJS.WarningListener>): void;
+
+    (event: 'message', code?: number | null, filter?: ReturningAny<NodeJS.MessageListener>): void;
+
+    (event: NodeJS.Signals, code?: number | null, filter?: ReturningAny<NodeJS.SignalsListener>): void;
+
+    (event: 'newListener', code?: number | null, filter?: ReturningAny<NodeJS.NewListenerListener>): void;
+
+    (event: 'removeListener', code?: number | null, filter?: ReturningAny<NodeJS.RemoveListenerListener>): void;
+
+    (event: 'multipleResolves', code?: number | null, filter?: ReturningAny<NodeJS.MultipleResolveListener>): void;
+  }
+
+  interface AsyncExitHook {
+    /** Register a new exit hook. */
+    (hook: SyncHook | AsyncHook): void;
+
+    /**
+     * Register new signal / event to hook to.
+     *
+     * @param event The signal or event name to listen to, using `process.on()`. eg 'SIGBREAK' or 'beforeExit'.
+     * @param code The code to exit the process with.
+     * @param filter A function that will be called with the `process.on()` signal/event handler arguments.
+     *   Returning `true` will not cause the exit hook to fire.
+     */
+    hookEvent: HookEventFunction;
+
+    /**
+     * Unhook signal / event.
+     *
+     * @param event The signal or event name to stop listen to. eg 'SIGBREAK' or 'beforeExit'.
+     */
+    unhookEvent: (event: ProcessEventOrSignal) => void;
+
+    /** List hooked events. */
+    hookedEvents: () => ProcessEventOrSignal[];
+
+    /**
+     * Add an uncaught exception handler.
+     * Note: it will be called for 'uncaughtException', but also for 'unhandledRejection'
+     */
+    uncaughtExceptionHandler: (hook: SyncErrorHook | AsyncErrorHook) => void;
+
+    /** Add an unhandled rejection handler. */
+    unhandledRejectionHandler: (hook: SyncErrorHook | AsyncErrorHook) => void;
+
+    /**
+     * Configure the time to wait for async hooks to finish, in total, after which the process will forcefully exit.
+     * The default is 10000 = 10 seconds.
+     * The maximum is the upper bound of a signed integer, which is (2^31 - 1) = 2147483647 = ~25 days!
+     *
+     * @param ms The time in milliseconds.
+     */
+    forceExitTimeout: (ms: number) => void;
+  }
+}
+
+
+declare const add: AsyncExitHook.AsyncExitHook;
+
+declare module 'async-exit-hook' {
+  export = add;
+}
diff --git a/package.json b/package.json
index 8cbd1fe..336d5d9 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,7 @@
   "files": [
     "index.js"
   ],
+  "types": "index.d.ts",
   "keywords": [
     "exit",
     "quit",