diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index ce43440..0000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,72 +0,0 @@
-version: 2
-jobs:
-  build:
-    docker:
-      - image: circleci/node:10
-
-    working_directory: ~/workspace
-
-    steps:
-      - checkout
-
-      - restore_cache:
-          keys:
-          - v1-dependencies-{{ checksum "package.json" }}
-
-      - run: npm install
-
-      - save_cache:
-          paths:
-            - node_modules
-          key: v1-dependencies-{{ checksum "package.json" }}
-
-      - store_test_results:
-          path: reports/junit
-
-  publish:
-    docker:
-      - image: circleci/node:10
-
-    steps:
-      - add_ssh_keys
-      - checkout
-
-      - run:
-          name: Authorize NPM
-          command: echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" > ~/.npmrc
-
-      - restore_cache:
-          keys:
-          - v1-dependencies-{{ checksum "package.json" }}
-
-      - run: npm install
-
-      - save_cache:
-          paths:
-            - node_modules
-          key: v1-dependencies-{{ checksum "package.json" }}
-
-      - run:
-          name: Publish to NPM
-          command: npm publish
-          
-workflows:
-  version: 2
-  main:
-    jobs:
-      - build:
-          context: org-global
-          filters:
-            branches:
-              only: master
-            tags:
-              only: /v.*/
-      - publish:
-          context: org-global
-          requires:
-            - build
-          filters:
-            branches:
-              ignore: /.*/
-            tags:
-              only: /v.*/  
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index b512c09..e647f4b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
-node_modules
\ No newline at end of file
+node_modules
+index.js
+index.d.ts
diff --git a/.npmignore b/.npmignore
new file mode 100644
index 0000000..1e21bee
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1 @@
+index.ts
diff --git a/index.js b/index.js
deleted file mode 100644
index de16842..0000000
--- a/index.js
+++ /dev/null
@@ -1,29 +0,0 @@
-export default function (urls, test, callback) {
-  let remaining = urls.length
-
-  function maybeCallback () {
-    remaining = --remaining
-    if (remaining < 1) {
-      callback()
-    }
-  }
-
-  if (!test()) {
-    urls.forEach(({ type, url, options = { async: true, defer: true }}) => {
-      const isScript = type === 'script'
-      const tag = document.createElement(isScript ? 'script': 'link')
-      if (isScript) {
-        tag.src = url
-        tag.async = options.async
-        tag.defer = options.defer
-      } else {
-        tag.rel = 'stylesheet'
-		    tag.href = url
-      }
-      tag.onload = maybeCallback
-      document.body.appendChild(tag)
-    })
-  } else {
-    callback()
-  }
-}
diff --git a/index.ts b/index.ts
new file mode 100644
index 0000000..e72114d
--- /dev/null
+++ b/index.ts
@@ -0,0 +1,45 @@
+interface URL {
+  type: 'script' | 'style';
+  url: string;
+  options?: {
+    async: boolean;
+    defer: boolean;
+  }
+}
+
+function makeScript(url: string, async: boolean, defer: boolean) {
+  const tag = document.createElement('script')
+  tag.src = url
+  tag.async = async
+  tag.defer = defer
+  return tag
+}
+
+function makeLink(url: string) {
+  const tag = document.createElement('link')
+  tag.rel = 'stylesheet'
+  tag.href = url
+  return tag
+}
+
+export default function (urls: URL[], test: () => boolean, callback: () => void) {
+  let remaining = urls.length
+
+  function maybeCallback () {
+    remaining = --remaining
+    if (remaining < 1) {
+      callback()
+    }
+  }
+
+  if (!test()) {
+    urls.forEach(({ type, url, options = { async: true, defer: true }}) => {
+      const isScript = type === 'script'
+      const tag = isScript ? makeScript(url, options.async, options.defer) : makeLink(url)
+      tag.onload = maybeCallback
+      document.body.appendChild(tag)
+    })
+  } else {
+    callback()
+  }
+}
diff --git a/package-lock.json b/package-lock.json
index 6cd5131..23a3b5a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,808 +4,17 @@
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-      "dev": true,
-      "requires": {
-        "@babel/highlight": "^7.10.4"
-      }
-    },
-    "@babel/helper-validator-identifier": {
-      "version": "7.10.4",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
-      "integrity": "sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==",
-      "dev": true
-    },
-    "@babel/highlight": {
-      "version": "7.10.4",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
-      "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-validator-identifier": "^7.10.4",
-        "chalk": "^2.0.0",
-        "js-tokens": "^4.0.0"
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-        "chalk": {
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-          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "^3.2.1",
-            "escape-string-regexp": "^1.0.5",
-            "supports-color": "^5.3.0"
-          }
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-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.11.2.tgz",
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+    "typescript": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.3.tgz",
+      "integrity": "sha512-tEu6DGxGgRJPb/mVPIZ48e69xCn2yRmCgYmDugAVwmJ6o+0u1RI18eO7E7WBTLYLaEVVOhwQmcdhQHweux/WPg==",
       "dev": true
-    },
-    "yauzl": {
-      "version": "2.10.0",
-      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
-      "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
-      "dev": true,
-      "requires": {
-        "buffer-crc32": "~0.2.3",
-        "fd-slicer": "~1.1.0"
-      }
     }
   }
 }
diff --git a/package.json b/package.json
index c8eac0b..8fbbc9b 100644
--- a/package.json
+++ b/package.json
@@ -3,8 +3,9 @@
   "version": "2.0.0",
   "description": "Loads scripts cleanly and asynchronously in SPAs",
   "main": "index.js",
+  "types": "index.d.ts",
   "scripts": {
-    "test": "node test-runner.js"
+    "build": "tsc"
   },
   "keywords": [
     "async",
@@ -16,9 +17,7 @@
   "author": "Antony Jones",
   "license": "MIT",
   "devDependencies": {
-    "esm": "^3.2.25",
-    "polkadot": "^1.0.0",
-    "pptr-testing-library": "^0.6.4",
-    "puppeteer": "^5.3.1"
+    "@tsconfig/recommended": "^1.0.1",
+    "typescript": "^4.0.3"
   }
 }
diff --git a/test-runner.js b/test-runner.js
deleted file mode 100644
index 072f4f0..0000000
--- a/test-runner.js
+++ /dev/null
@@ -1,2 +0,0 @@
-require = require('esm')(module)
-module.exports = require('./test.js')
diff --git a/test.wip.js b/test.wip.js
deleted file mode 100644
index 81c78cb..0000000
--- a/test.wip.js
+++ /dev/null
@@ -1,20 +0,0 @@
-import polkadot from 'polkadot'
-import puppeteer from 'puppeteer'
-import { getDocument, queries } from 'pptr-testing-library'
-
-const app = polkadot(async (req, res) => {
-  return 'console.log("hello")'
-});
- 
-app.listen(5491, err => {
-  if (err) throw err
-})
-
-async function run () {
-  const browser = await puppeteer.launch()
-  const page = await browser.newPage()
-
-  const $document = await getDocument(page)
-}
-
-run()
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..8b0dcbc
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "@tsconfig/recommended/tsconfig.json",
+  "compilerOptions": { "declaration": true }
+}