diff --git a/segment-analytics/segment-analytics.d.ts b/segment-analytics/segment-analytics.d.ts
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+// Type definitions for Segment's analytics.js
+// Project: https://segment.com/docs/libraries/analytics.js/
+// Definitions by: Andrew Fong <https://github.com/fongandrew>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module SegmentAnalytics {
+
+  // Generic options object with integrations
+  interface ISegmentOpts<Integrations> {
+    integrations: Integrations;
+  };
+
+  // The actual analytics.js object
+  interface AnalyticsJS<Integrations> {
+
+    /* Configure Segment with write key */
+    load(writeKey: string);
+
+    /* The identify method is how you tie one of your users and their actions
+       to a recognizable userId and traits. */
+    identify(userId: string, traits?: Object,
+             options?: ISegmentOpts<Integrations>,
+             callback?: () => void): void;
+    identify(userId: string, traits: Object, callback?: () => void): void;
+    identify(userId: string, callback?: () => void): void;
+    identify(traits?: Object,
+             options?: ISegmentOpts<Integrations>,
+             callback?: () => void): void;
+    identify(traits?: Object,
+             callback?: () => void): void;
+    identify(callback: () => void): void;
+
+    /* The track method lets you record any actions your users perform. */
+    track(event: string, properties?: Object,
+          options?: ISegmentOpts<Integrations>,
+          callback?: () => void): void;
+    track(event: string, properties?: Object,
+          callback?: () => void): void;
+    track(event: string, callback?: () => void): void;
+
+    /* The page method lets you record page views on your website, along with
+       optional extra information about the page being viewed. */
+    page(category: string, name: string, properties?: Object,
+         options?: ISegmentOpts<Integrations>,
+         callback?: () => void): void;
+    page(name?: string, properties?: Object,
+         options?: ISegmentOpts<Integrations>,
+         callback?: () => void): void;
+    page(name?: string, properties?: Object, callback?: () => void): void;
+    page(name?: string, callback?: () => void): void;
+    page(properties?: Object,
+         options?: ISegmentOpts<Integrations>,
+         callback?: () => void): void;
+    page(callback?: () => void): void;
+
+    /* The alias method combines two previously unassociated user identities.
+       This comes in handy if the same user visits from two different devices
+       and you want to combine their history.
+
+       Some providers also don’t alias automatically for you when an anonymous
+       user signs up (like Mixpanel), so you need to call alias manually right
+       after sign up with their brand new userId. */
+    alias(userId: string, previousId?: string,
+          options?: ISegmentOpts<Integrations>,
+          callback?: () => void): void;
+    alias(userId: string, previousId?: string, callback?: () => void): void;
+    alias(userId: string, callback?: () => void): void;
+    alias(userId: string, options?: ISegmentOpts<Integrations>,
+          callback?: () => void): void;
+
+    /* trackLink is a helper that binds a track call to whenever a link is
+       clicked. Usually the page would change before you could call track, but
+       with trackLink a small timeout is inserted to give the track call enough
+       time to fire. */
+    trackLink(elements: Element|Element[], event: string, properties?: Object);
+
+    /* trackForm is a helper that binds a track call to a form submission.
+       Usually the page would change before you could call track, but with
+       trackForm a small timeout is inserted to give the track call enough
+       time to fire. */
+    trackForm(elements: Element|Element[], event: string, properties?: Object);
+
+    /* The ready method allows you to pass in a callback that will be called as
+       soon as all of your enabled integrations have loaded. It’s like jQuery’s
+       ready method, except for integrations. */
+    ready(callback: () => void);
+
+    // Cookie-based user object
+    user(): {
+      id(): string;
+      logout(): void;
+      reset(): void;
+    };
+  }
+}
+
+
+// declare var analytics: ISegment<IIntegrations>;
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