diff --git a/package-lock.json b/package-lock.json
index ac18154d..b750e233 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -40,6 +40,11 @@
       "integrity": "sha512-+iTbntw2IZPb/anVDbypzfQa+ay64MW0Zo8aJ8gZPWMMK6/OubMVb6lUPMagqjOPnmtauXnFCACVl3O7ogjeqQ==",
       "dev": true
     },
+    "@types/node": {
+      "version": "12.7.8",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.7.8.tgz",
+      "integrity": "sha512-FMdVn84tJJdV+xe+53sYiZS4R5yn1mAIxfj+DVoNiQjTYz1+OYmjwEZr1ev9nU0axXwda0QDbYl06QHanRVH3A=="
+    },
     "ansi-colors": {
       "version": "3.2.3",
       "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.2.3.tgz",
@@ -469,9 +474,9 @@
       },
       "dependencies": {
         "is-buffer": {
-          "version": "2.0.3",
-          "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.3.tgz",
-          "integrity": "sha512-U15Q7MXTuZlrbymiz95PJpZxu8IlipAp4dtS3wOdgPXx3mqBnslrWU14kxfHB+Py/+2PVKSr37dMAgM2A4uArw==",
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.4.tgz",
+          "integrity": "sha512-Kq1rokWXOPXWuaMAqZiJW4XxsmD9zGx9q4aePabbn3qCRGedtH7Cm+zV8WETitMfu1wdh+Rvd6w5egwSngUX2A==",
           "dev": true
         }
       }
@@ -1544,6 +1549,11 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
+    "typescript": {
+      "version": "3.6.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.6.3.tgz",
+      "integrity": "sha512-N7bceJL1CtRQ2RiG0AQME13ksR7DiuQh/QehubYcghzv20tnh+MQnQIuJddTmsbqYj+dztchykemz0zFzlvdQw=="
+    },
     "uglify-js": {
       "version": "3.6.0",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.0.tgz",
diff --git a/package.json b/package.json
index 1d00f77b..de71cf9d 100644
--- a/package.json
+++ b/package.json
@@ -5,14 +5,17 @@
   "repository": "https://github.com/imgix/imgix-core-js",
   "scripts": {
     "assert_version": "node assert_version.js",
-    "compile": "mkdir -p dist && uglifyjs ./src/imgix-core-js.js -o ./dist/imgix-core-js.min.js && cp ./src/imgix-core-js.js ./dist/imgix-core-js.js",
+    "compile": "mkdir -p dist && uglifyjs ./src/imgix-core-js.js -o ./dist/imgix-core-js.min.js && cp ./src/imgix-core-js.js ./dist/imgix-core-js.js && cp ./src/imgix-core-js.d.ts ./dist/imgix-core-js.d.ts && tsc",
     "prepublish": "npm run compile && npm run assert_version",
     "test": "mocha"
   },
   "main": "dist/imgix-core-js.js",
+  "types": "dist/imgix-core-js.d.ts",
   "dependencies": {
     "js-base64": "^2.1.9",
-    "md5": "^2.2.1"
+    "md5": "^2.2.1",
+    "typescript": "^3.6.3",
+    "@types/node": "^12.7.8"
   },
   "license": "BSD-2-Clause",
   "devDependencies": {
diff --git a/src/imgix-core-js.d.ts b/src/imgix-core-js.d.ts
new file mode 100644
index 00000000..61590951
--- /dev/null
+++ b/src/imgix-core-js.d.ts
@@ -0,0 +1,20 @@
+// Type definitions for imgix-core-js.js
+
+declare class ImgixClient {
+    domain: string;
+    useHTTPS: boolean;
+    includeLibraryParam: boolean;
+    secureURLToken: string;
+
+    constructor(opts: {domain: string; secureURLToken?: string; useHTTPS?: boolean; includeLibraryParam?: boolean;});
+
+
+    buildURL(path: string, params?: {}): string;
+    _sanitizePath(path: string): string;
+    _buildParams(params: {}): string;
+    _signParams(path: string, queryParams?: {}): string;
+    buildSrcSet(path: string, params?: {}): string;
+    _buildSrcSetPairs(path: string, params?: {}): string;
+    _buildDPRSrcSet(path: string, params?: {}): string;
+}
+export = ImgixClient;
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..73d684f2
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,12 @@
+{
+    "compilerOptions": {
+        "target": "es2015",
+        "module": "umd",
+        "types": [
+            "node"
+         ]
+    },
+    "files": [
+        "src/imgix-core-js.d.ts"
+    ]
+}