diff --git a/.gitignore b/.gitignore
index e4c5b0e..6780e0b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,6 +27,7 @@ coverage
 .lock-wscript
 
 build
+docs
 
 # Dependency directory
 # https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git
diff --git a/package.json b/package.json
index a2000ed..dd85794 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
     "test": "aegir test",
     "test:node": "aegir test --target node",
     "test:browser": "aegir test --target browser",
+    "test:types": "npx tsc",
     "release": "aegir release",
     "release-minor": "aegir release --type minor",
     "release-major": "aegir release --type major",
@@ -27,11 +28,13 @@
   "bugs": "https://github.com/multiformats/js-mafmt/issues",
   "homepage": "https://github.com/multiformats/js-mafmt#readme",
   "devDependencies": {
-    "aegir": "^20.0.0",
+    "@types/chai": "^4.2.8",
+    "@types/mocha": "^7.0.1",
+    "aegir": "^20.6.0",
     "chai": "^4.2.0"
   },
   "dependencies": {
-    "multiaddr": "^7.0.0"
+    "multiaddr": "^7.3.0"
   },
   "contributors": [
     "Alan Shaw <alan@tableflip.io>",
diff --git a/src/index.d.ts b/src/index.d.ts
new file mode 100644
index 0000000..34fcef8
--- /dev/null
+++ b/src/index.d.ts
@@ -0,0 +1,28 @@
+import Multiaddr = require('multiaddr');
+
+export declare interface Mafmt {
+  toString(): string;
+  input?: (Mafmt | (() => Mafmt))[];
+  matches: (a: string | Buffer | Multiaddr) => boolean;
+  partialMatch: (protos: string[]) => boolean;
+}
+
+export const DNS: Mafmt;
+export const DNS4: Mafmt;
+export const DNS6: Mafmt;
+export const IP: Mafmt;
+export const TCP: Mafmt;
+export const UDP: Mafmt;
+export const UTP: Mafmt;
+export const HTTP: Mafmt;
+export const HTTPS: Mafmt;
+export const WebSockets: Mafmt;
+export const WebSocketsSecure: Mafmt;
+export const WebSocketStar: Mafmt;
+export const WebRTCStar: Mafmt;
+export const WebRTCDirect: Mafmt;
+export const Reliable: Mafmt;
+export const Stardust: Mafmt;
+export const Circuit: Mafmt;
+export const P2P: Mafmt;
+export const IPFS: Mafmt;
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..df493db
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,38 @@
+
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "target": "ES5",
+        "noImplicitAny": false,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "esModuleInterop": true,
+        "resolveJsonModule": true,
+        "allowJs": true,
+        "checkJs": true,
+        "baseUrl": ".",
+        "paths": {
+            "mafmt": [
+                "./src",
+                "../src",
+            ]
+        },
+        "types": [
+            "node",
+            "mocha",
+            "chai"
+        ],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "./src/index.d.ts",
+    ],
+    "include": [
+        "./test/**/*.spec.js"
+    ]
+}