diff --git a/raygun4js/raygun4js-tests.ts b/raygun4js/raygun4js-tests.ts
new file mode 100644
index 0000000000..56577765ce
--- /dev/null
+++ b/raygun4js/raygun4js-tests.ts
@@ -0,0 +1,48 @@
+/// <reference path="raygun4js.d.ts"/>
+
+var client: raygun.RaygunStatic = Raygun.noConflict();
+
+var newClient: raygun.RaygunStatic = client.constructNewRaygun();
+
+client.init('api-key');
+client.init('api-key', { allowInsecureSubmissions: true });
+client.init('api-key', { allowInsecureSubmissions: true }, { some: 'data' });
+
+client.withCustomData({ some: 'data' });
+
+client.withTags(['tag1', 'tag2']);
+
+client.attach().detach();
+
+client.send(new Error('a error'));
+client.send(new Error('a error'), ['tag1', 'tag2']);
+
+try {
+    throw new Error('oops');
+}
+catch (e) {
+    client.send(e);
+}
+
+client.setUser('username');
+client.setUser('username', true);
+client.setUser('username', false, 'user@email.com', 'Robbie Robot');
+client.setUser('username', false, 'user@email.com', 'Robbie Robot', 'Robbie');
+client.setUser('username', false, 'user@email.com', 'Robbie Robot', 'Robbie', '8ae89fc9-1144-42d6-9629-bf085dab18d2');
+
+client.resetAnonymousUser();
+
+client.setVersion('1.2.3.4');
+
+client.saveIfOffline(true);
+
+client.filterSensitiveData(['field1', 'field2']);
+
+client.setFilterScope('all');
+
+client.whitelistCrossOriginDomains(['domain1', 'domain2']);
+
+client.onBeforeSend(payload=> {
+    payload.OccurredOn = new Date();
+    return payload;
+});
\ No newline at end of file
diff --git a/raygun4js/raygun4js.d.ts b/raygun4js/raygun4js.d.ts
new file mode 100644
index 0000000000..a3c2feeb41
--- /dev/null
+++ b/raygun4js/raygun4js.d.ts
@@ -0,0 +1,97 @@
+// Type definitions for raygun4js 1.18.3
+// Project: https://github.com/MindscapeHQ/raygun4js
+// Definitions by: Brian Surowiec <https://github.com/xt0rted>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module raygun {
+
+    // https://github.com/MindscapeHQ/raygun4js/blob/c7d8880045214ab6d403d5cc613c207f696a3cdd/src/raygun.js#L533-539
+    interface IStackTrace {
+        LineNumber: number;
+        ColumnNumber: number;
+        ClassName: string;
+        FileName: string;
+        MethodName: string;
+    }
+
+    // https://github.com/MindscapeHQ/raygun4js/blob/c7d8880045214ab6d403d5cc613c207f696a3cdd/src/raygun.js#L598-637
+    interface IPayload {
+        OccurredOn: Date;
+        Details: {
+            Error: {
+                ClassName: string;
+                Message: string;
+                StackTrace: IStackTrace[];
+            };
+            Environment: {
+                UtcOffset: number;
+                'User-Language': string;
+                'Document-Mode': number;
+                'Browser-Width': number;
+                'Browser-Height': number;
+                'Screen-Width': number;
+                'Screen-Height': number;
+                'Color-Depth': number;
+                Browser: string;
+                'Browser-Name': string;
+                'Browser-Version': string;
+                Platform: string;
+            };
+            Client: {
+                Name: string;
+                Version: string;
+            };
+            UserCustomData: any;
+            Tags: string[];
+            Request: {
+                Url: string;
+                QueryString: string;
+                Headers: {
+                    'User-Agent': string;
+                    Referer: string;
+                    Host: string;
+                };
+            };
+            Version: string;
+        };
+    }
+
+    // https://github.com/MindscapeHQ/raygun4js/blob/c7d8880045214ab6d403d5cc613c207f696a3cdd/src/raygun.js#L61-82
+    interface IRaygunOptions {
+        allowInsecureSubmissions?: boolean;
+        ignoreAjaxAbort?: boolean;
+        ignoreAjaxError?: boolean;
+        disableAnonymousUserTracking?: boolean;
+        excludedHostnames?: boolean;
+        excludedUserAgents?: boolean;
+        wrapAsynchronousCallbacks?: boolean;
+        debugMode?: boolean;
+        ignore3rdPartyErrors?: boolean;
+    }
+
+    interface RaygunStatic {
+        noConflict(): RaygunStatic;
+        constructNewRaygun(): RaygunStatic;
+        init(apiKey: string, options?: IRaygunOptions, customdata?: any): RaygunStatic;
+        withCustomData(customdata: any): RaygunStatic;
+        withTags(tags: string[]): RaygunStatic;
+        attach(): RaygunStatic;
+        detach(): RaygunStatic;
+        send(e: Error, customData?: any, tags?: string[]): RaygunStatic;
+        setUser(user: string, isAnonymous?: boolean, email?: string, fullName?: string, firstName?: string, uuid?: string): RaygunStatic;
+        resetAnonymousUser(): void;
+        setVersion(version: string): RaygunStatic;
+        saveIfOffline(enableOffline: boolean): RaygunStatic;
+        filterSensitiveData(filteredKeys: string[]): RaygunStatic;
+        setFilterScope(scope: string): RaygunStatic;
+        whitelistCrossOriginDomains(whitelist: string[]): RaygunStatic;
+        onBeforeSend(callback: (payload: IPayload) => IPayload): RaygunStatic;
+    }
+
+}
+
+declare var Raygun: raygun.RaygunStatic;
+
+declare module 'Raygun' {
+    export = Raygun;
+}
\ No newline at end of file