diff --git a/types/raygun/index.d.ts b/types/raygun/index.d.ts
new file mode 100644
index 0000000000..9315161a33
--- /dev/null
+++ b/types/raygun/index.d.ts
@@ -0,0 +1,146 @@
+// Type definitions for raygun 0.10
+// Project: https://github.com/MindscapeHQ/raygun4node
+// Definitions by: Taylor Lodge <https://github.com/UberMouse>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.4
+
+declare namespace raygun {
+    interface KeyValueObject {
+        [key: string]: string | number | boolean | KeyValueObject;
+    }
+    interface StackFrame {
+        lineNumber: number;
+        className: string;
+        fileName: string;
+        methodName: string;
+        columnNumber?: number;
+    }
+    interface RaygunErrorObject {
+        message: string;
+        className: string;
+        stackTrace: StackFrame[];
+        innerError?: RaygunErrorObject;
+    }
+    interface RaygunRequest {
+        hostname?: string;
+        host?: string;
+        path?: string;
+        method?: string;
+        ip?: string;
+        queryString?: KeyValueObject;
+        headers?: KeyValueObject;
+        form?: KeyValueObject;
+    }
+    interface RaygunUser {
+        identifier: string;
+        email?: string;
+        fullName?: string;
+        firstName?: string;
+        uuid?: string;
+    }
+    interface RaygunPayload {
+        occurredOn: Date;
+        details: {
+            client: {
+                name: "raygun-node";
+                version: string;
+            };
+            groupingKey?: string;
+            error: RaygunErrorObject;
+            environment: {
+                osVersion: string;
+                architecture: string;
+                totalPhysicalMemory: number;
+                availablePhysicalMemory: number;
+                utcOffset: number;
+                processorCount?: number;
+                cpu: {
+                    model: string;
+                    speed: number;
+                    times: {
+                        user: number;
+                        nice: number;
+                        sys: number;
+                        idle: number;
+                        irq: number;
+                    };
+                };
+            };
+            machineName: string;
+            userCustomData?: KeyValueObject;
+            tags: string[];
+            request?: RaygunRequest;
+            user?: RaygunUser | { identifier: string };
+            version?: string;
+        };
+    }
+
+    interface RaygunOfflineStorageProvider<
+        TTransportItem = RaygunPayload,
+        TStorageItem = string
+    > {
+        init(options: any): RaygunOfflineStorageProvider;
+        save(item: TTransportItem, callback: (error?: Error) => void): void;
+        retrieve(
+            callback: (
+                error: Error,
+                storageItems: ReadonlyArray<TStorageItem>
+            ) => void
+        ): void;
+        send(
+            callback: (
+                error: Error,
+                sendItems: ReadonlyArray<TStorageItem>
+            ) => void
+        ): void;
+    }
+
+    type OnBeforeSend = (
+        payload: RaygunPayload,
+        exception: Error,
+        customData: KeyValueObject,
+        request: RaygunRequest,
+        tags: ReadonlyArray<string>
+    ) => boolean | RaygunPayload;
+    interface RaygunOptions {
+        apiKey: string;
+        filters?: ReadonlyArray<string>;
+        port?: number;
+        host?: string;
+        useSSL?: boolean;
+        onBeforeSend?: OnBeforeSend;
+        offlineStorage?: RaygunOfflineStorageProvider;
+        offlineStorageOptions?: any;
+        isOffline?: boolean;
+        groupingKey?: string;
+        tags?: ReadonlyArray<string>;
+        userHumanStringForObject?: boolean;
+        reportColumnNumbers?: boolean;
+        innerErrorFieldName?: string;
+    }
+}
+
+declare class Client {
+    init(options: raygun.RaygunOptions): Client;
+    setUser(user: raygun.RaygunUser): Client;
+    setVersion(version: string): Client;
+    onBeforeSend(callback: raygun.OnBeforeSend): Client;
+    groupingKey(groupingKey: string): Client;
+    offline(): Client;
+    online(): Client;
+    send(
+        exception: Error | string | object,
+        customData?: raygun.KeyValueObject,
+        offlineStorageCallback?: (error?: Error) => void,
+        request?: raygun.RaygunRequest,
+        tags?: ReadonlyArray<string>
+    ): raygun.RaygunPayload;
+    expressHandler(
+        error: Error,
+        request: raygun.RaygunRequest,
+        res: any,
+        next: any
+    ): void;
+}
+
+export = Client;
diff --git a/types/raygun/raygun-tests.ts b/types/raygun/raygun-tests.ts
new file mode 100644
index 0000000000..76328b01c5
--- /dev/null
+++ b/types/raygun/raygun-tests.ts
@@ -0,0 +1,59 @@
+import Client = require('raygun');
+
+const client = new Client(); // $ExpectType Client
+client.init({apiKey: '1'}); // $ExpectType Client
+
+client.init(); // $ExpectError
+client.init({}); // $ExpectError
+client.init({apiKey: 123}); // $ExpectError
+//
+// $ExpectType Client
+client.setUser({
+    identifier: '123'
+});
+// $ExpectType Client
+client.setUser({
+    identifier: '123',
+    email: '123',
+    fullName: '123',
+    firstName: '123',
+    uuid: '123'
+});
+
+client.setUser(); // $ExpectError
+client.setUser({}); // $ExpectError
+client.setUser({identifier: 1}); // $ExpectError
+
+client.setVersion('123'); // $ExpectType Client
+
+client.setVersion(); // $ExpectError
+client.setVersion({}); // $ExpectError
+
+client.onBeforeSend(payload => payload); // $ExpectType Client
+// $ExpectType Client
+client.onBeforeSend(payload => {
+    payload.details;
+
+    return payload;
+});
+
+client.onBeforeSend(); // $ExpectError
+
+client.groupingKey('123'); // $ExpectType Client
+
+client.groupingKey(); // $ExpectError
+client.groupingKey({}); // $ExpectError
+
+client.offline(); // $ExpectType Client
+
+client.online(); // $ExpectType Client
+
+client.send(new Error()); // $ExpectType RaygunPayload
+client.send({foo: 'bar'}); // $ExpectType RaygunPayload
+client.send('error message'); // $ExpectType RaygunPayload
+client.send(new Error(), {foo: 'bar'}); // $ExpectType RaygunPayload
+client.send(new Error(), {}, undefined, undefined, ['1', '2']); // $ExpectType RaygunPayload
+
+client.send(); // $ExpectError
+client.send(null); // $ExpectError
+client.send(undefined); // $ExpectError
diff --git a/types/raygun/tsconfig.json b/types/raygun/tsconfig.json
new file mode 100644
index 0000000000..f85de6fb88
--- /dev/null
+++ b/types/raygun/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "raygun-tests.ts"
+    ]
+}
diff --git a/types/raygun/tslint.json b/types/raygun/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/raygun/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }