diff --git a/types/steam-totp/index.d.ts b/types/steam-totp/index.d.ts
new file mode 100644
index 0000000000..a3ff963428
--- /dev/null
+++ b/types/steam-totp/index.d.ts
@@ -0,0 +1,67 @@
+// Type definitions for steam-totp 2.0
+// Project: https://github.com/DoctorMcKay/node-steam-totp
+// Definitions by: Max Uetrecht <https://github.com/phenomax>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+/// <reference types="node" />
+
+export type TimeOffsetFunction = () => number;
+
+/**
+ * Returns the current local Unix time
+ * @param [timeOffset=0] - This many seconds will be added to the returned time
+ * @returns the current local Unix time
+ */
+export function time(timeOffset?: number): number;
+
+/**
+ * Generate a Steam-style TOTP authentication code.
+ * @param secret - Your TOTP shared_secret as a Buffer, hex, or base64
+ * @param [timeOffset=0] - If you know how far off your clock is from the Steam servers, put the offset here in seconds
+ * @returns the generated auth code
+ */
+export function generateAuthCode(secret: string, timeOffset: number | TimeOffsetFunction): string;
+
+/**
+ * Generate a Steam-style TOTP authentication code.
+ * @param secret - Your TOTP shared_secret as a Buffer, hex, or base64
+ * @param [timeOffset=0] - If you know how far off your clock is from the Steam servers, put the offset here in seconds
+ * @returns the generated auth code
+ */
+export function getAuthCode(secret: string, timeOffset: number | TimeOffsetFunction): string;
+
+/**
+ * Generate a base64 confirmation key for use with mobile trade confirmations. The key can only be used once.
+ * @param identitySecret - The identity_secret that you received when enabling two-factor authentication
+ * @param time - The Unix time for which you are generating this secret. Generally should be the current time.
+ * @param tag - The tag which identifies what this request (and therefore key) will be for.
+ * "conf" to load the confirmations page, "details" to load details about a trade, "allow" to confirm a trade, "cancel" to cancel it.
+ * @returns the generated confirmation key
+ */
+export function generateConfirmationKey(identitySecret: Buffer | string, time: number, tag: string): string;
+
+/**
+ * Generate a base64 confirmation key for use with mobile trade confirmations. The key can only be used once.
+ * @param identitySecret - The identity_secret that you received when enabling two-factor authentication
+ * @param time - The Unix time for which you are generating this secret. Generally should be the current time.
+ * @param tag - The tag which identifies what this request (and therefore key) will be for.
+ * "conf" to load the confirmations page, "details" to load details about a trade, "allow" to confirm a trade, "cancel" to cancel it.
+ * @returns the generated confirmation key
+ */
+export function getConfirmationKey(identitySecret: Buffer | string, time: number, tag: string): string;
+
+/**
+ * Requests the time offset from the Steam API.
+ * @param callback - The result of the steam api request
+ * @param [timeOffset=0] - If you know how far off your clock is from the Steam servers, put the offset here in seconds
+ * @returns the time offset
+ */
+export function getTimeOffset(callback: (error: Error, offset?: number, elapsedTime?: number) => void): void;
+
+/**
+ * Get a standardized device ID based on your SteamID.
+ * @param steamID - Your SteamID, either as a string or as an object which has a toString() method that returns the SteamID
+ * @returns the device ID
+ */
+export function getDeviceID(steamID: string | object): string;
diff --git a/types/steam-totp/steam-totp-tests.ts b/types/steam-totp/steam-totp-tests.ts
new file mode 100644
index 0000000000..57702ccaaa
--- /dev/null
+++ b/types/steam-totp/steam-totp-tests.ts
@@ -0,0 +1,3 @@
+import steamTotp = require('steam-totp');
+
+const time: number = steamTotp.time();
diff --git a/types/steam-totp/tsconfig.json b/types/steam-totp/tsconfig.json
new file mode 100644
index 0000000000..01223cacba
--- /dev/null
+++ b/types/steam-totp/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",
+        "steam-totp-tests.ts"
+    ]
+}
diff --git a/types/steam-totp/tslint.json b/types/steam-totp/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/steam-totp/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }