diff --git a/types/postmate/index.d.ts b/types/postmate/index.d.ts
new file mode 100644
index 0000000000..5a68ef27e7
--- /dev/null
+++ b/types/postmate/index.d.ts
@@ -0,0 +1,126 @@
+// Type definitions for postmate 1.5
+// Project: https://github.com/dollarshaveclub/postmate
+// Definitions by: Wayne Carson <https://github.com/wcarson>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/**
+ * This is written in the parent page. Creates an iFrame at the specified url. Initiates a connection with the
+ * child. Returns a Promise that signals when the handshake is complete and communication is ready to begin.
+ */
+declare class Postmate extends Promise<Postmate.ParentAPI> {
+    /**
+     * Set to true to enable logging of additional information. Default: false
+     */
+    static debug: boolean;
+
+    /**
+     * Replace the Promise API that Postmate uses. Default: window.Promise
+     */
+    static Promise: Promise<any>;
+
+    /**
+     * Initializes a new instance of Postmate
+     *
+     * @param options configuration options
+     */
+    constructor(options: Postmate.PostmateOptions);
+}
+
+declare namespace Postmate {
+    /**
+     * Options passed to the Postmate constructor
+     */
+    interface PostmateOptions {
+        /**
+         * An element to append the iFrame to. Default: document.body
+         */
+        container?: HTMLElement|null;
+
+        /**
+         * An object literal to represent the default values of the child's model
+         */
+        model?: any;
+
+        /**
+         * A URL to load in the iFrame. The origin of this URL will also be used for securing message transport
+         */
+        url: string;
+
+        /**
+         * An Array to add classes to the iFrame. Useful for styling
+         */
+        classListArray?: string[];
+    }
+
+    /**
+     * Composes an API to be used by the parent
+     */
+    interface ParentAPI {
+        /**
+         * The iFrame Element that the parent is communicating with
+         */
+        frame: HTMLIFrameElement;
+
+        /**
+         * Retrieves a value by property name from the child's model object.
+         *
+         * @param key The string property to lookup in the child's model
+         * @returns child model property value
+         */
+        get(key: string): Promise<any>;
+
+        /**
+         * Calls a function on the child's model
+         *
+         * @param key The string property to lookup in the child's model
+         * @param data The optional data to send to the child function
+         */
+        call(key: string, data?: any): void;
+
+        /**
+         * Listen to a particular event from the child
+         *
+         * @param eventName the name of the event
+         * @param callback the event handler function
+         */
+        on(eventName: string, callback: (data?: any) => void): void;
+
+        /**
+         * Removes the iFrame element and destroys any message event listeners
+         */
+        destroy(): void;
+    }
+
+    /**
+     * Composes an API to be used by the child
+     */
+    interface ChildAPI {
+        /**
+         * Emits an event to the parent
+         *
+         * @param name the name of the event
+         * @param data event data
+         */
+        emit(name: string, data?: any): void;
+    }
+
+    /**
+     * This is written in the child page. Calling Postmate.Model initiates a handshake request listener from the
+     * Child. Once the handshake is complete, an event listener is bound to receive requests from the Parent. The
+     * Child model is extended from the model provided by the Parent.
+     */
+    class Model extends Promise<ChildAPI> {
+        /**
+         * Initializes a new instance of Model
+         *
+         * @param model An object of gettable properties to expose to the parent. Value types may be anything
+         * accepted in postMessage. Promises may also be set as values or returned from functions. Default: {}
+         */
+        constructor(model: any);
+    }
+}
+
+/**
+ * Module export
+ */
+export = Postmate;
diff --git a/types/postmate/postmate-tests.ts b/types/postmate/postmate-tests.ts
new file mode 100644
index 0000000000..ef85372ff4
--- /dev/null
+++ b/types/postmate/postmate-tests.ts
@@ -0,0 +1,38 @@
+import Postmate = require('postmate');
+
+//
+// Tests are based on code samples on https://github.com/dollarshaveclub/postmate#usage
+//
+
+///////////////////////////
+// parent.com
+
+// Kick off the handshake with the iFrame
+const parentHandshake = new Postmate({
+  container: document.getElementById('some-div'),
+  url: 'http://child.com/page.html',
+  classListArray: ["myClass"]
+});
+
+// When parent <-> child handshake is complete, data may be requested from the child
+parentHandshake.then(child => {
+  // Fetch the height property in child.html and set it to the iFrames height
+  child.get('height')
+    .then(height => child.frame.style.height = `${height}px`);
+
+  // Listen to a particular event from the child
+  child.on('some-event', data => console.log(data)); // Logs "Hello, World!"
+});
+
+///////////////////////////
+// child.com/page.html
+
+const childHandshake = new Postmate.Model({
+  // Expose your model to the Parent. Property values may be functions, promises, or regular values
+  height: () => (document as any).height || document.body.offsetHeight
+});
+
+// When parent <-> child handshake is complete, events may be emitted to the parent
+childHandshake.then(parent => {
+  parent.emit('some-event', 'Hello, World!');
+});
diff --git a/types/postmate/tsconfig.json b/types/postmate/tsconfig.json
new file mode 100644
index 0000000000..4a70b478e7
--- /dev/null
+++ b/types/postmate/tsconfig.json
@@ -0,0 +1,24 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "postmate-tests.ts"
+    ]
+}
diff --git a/types/postmate/tslint.json b/types/postmate/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/postmate/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }