diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..3bb9642
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,16 @@
+name: Compressed Size
+
+on: [pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2-beta
+      with:
+        fetch-depth: 1
+    - uses: preactjs/compressed-size-action@v1
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"
diff --git a/README.md b/README.md
index 6255592..8a9d040 100644
--- a/README.md
+++ b/README.md
@@ -139,7 +139,7 @@ Unfetch will account for the following properties in `options`:
    target resource (The most common ones being `GET`, `POST`, `PUT`, `PATCH`, `HEAD`, `OPTIONS` or `DELETE`).
   * `headers`: An `Object` containing additional information to be sent with the request, e.g. `{ 'Content-Type': 'application/json' }` to indicate a JSON-typed request body.
   * `credentials`: ⚠ Accepts a `"include"` string, which will allow both CORS and same origin requests to work with cookies. As pointed in the ['Caveats' section](#caveats), Unfetch won't send or receive cookies otherwise. The `"same-origin"` value is not supported. ⚠
-  * `body`: The content to be transmited in request's body. Common content types include `FormData`, `JSON`, `Blob`, `ArrayBuffer` or plain text.
+  * `body`: The content to be transmitted in request's body. Common content types include `FormData`, `JSON`, `Blob`, `ArrayBuffer` or plain text.
 
 ### `response` Methods and Attributes
 These methods are used to handle the response accordingly in your Promise chain. Instead of implementing full spec-compliant [Response Class](https://fetch.spec.whatwg.org/#response-class) functionality, Unfetch provides the following methods and attributes:
diff --git a/package.json b/package.json
index 7e2ffdb..760273f 100644
--- a/package.json
+++ b/package.json
@@ -4,12 +4,12 @@
   "description": "Bare minimum fetch polyfill in 500 bytes",
   "unpkg": "polyfill/index.js",
   "main": "dist/unfetch.js",
-  "module": "dist/unfetch.mjs",
-  "jsnext:main": "dist/unfetch.mjs",
+  "module": "dist/unfetch.module.js",
+  "jsnext:main": "dist/unfetch.module.js",
   "umd:main": "dist/unfetch.umd.js",
   "scripts": {
     "test": "eslint src test && jest",
-    "build": "microbundle src/index.mjs && microbundle -f cjs polyfill/polyfill.mjs -o polyfill/index.js --no-sourcemap && cp dist/unfetch.mjs dist/unfetch.es.js",
+    "build": "microbundle src/index.mjs && microbundle -f cjs polyfill/polyfill.mjs -o polyfill/index.js --no-sourcemap && cp dist/unfetch.module.js dist/unfetch.es.js",
     "prepare": "npm run -s build",
     "release": "cross-var npm run build -s && cross-var git commit -am $npm_package_version && cross-var git tag $npm_package_version && git push && git push --tags && npm publish"
   },
diff --git a/packages/isomorphic-unfetch/browser.js b/packages/isomorphic-unfetch/browser.js
index 13b55c2..ed13eef 100644
--- a/packages/isomorphic-unfetch/browser.js
+++ b/packages/isomorphic-unfetch/browser.js
@@ -1 +1 @@
-module.exports = window.fetch || (window.fetch = require('unfetch').default || require('unfetch'));
+module.exports = self.fetch || (self.fetch = require('unfetch').default || require('unfetch'));
diff --git a/packages/isomorphic-unfetch/index.js b/packages/isomorphic-unfetch/index.js
index 6ae374c..dacdb66 100644
--- a/packages/isomorphic-unfetch/index.js
+++ b/packages/isomorphic-unfetch/index.js
@@ -1,5 +1,6 @@
+function r(m){return m && m.default || m;}
 module.exports = global.fetch = global.fetch || (
-	typeof process=='undefined' ? (require('unfetch').default || require('unfetch')) : (function(url, opts) {
-		return require('node-fetch')(url.replace(/^\/\//g,'https://'), opts);
+	typeof process=='undefined' ? r(require('unfetch')) : (function(url, opts) {
+		return r(require('node-fetch'))(String(url).replace(/^\/\//g,'https://'), opts);
 	})
 );
diff --git a/packages/isomorphic-unfetch/package-lock.json b/packages/isomorphic-unfetch/package-lock.json
new file mode 100644
index 0000000..3330abe
--- /dev/null
+++ b/packages/isomorphic-unfetch/package-lock.json
@@ -0,0 +1,13 @@
+{
+  "name": "isomorphic-unfetch",
+  "version": "3.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "node-fetch": {
+      "version": "2.6.1",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.1.tgz",
+      "integrity": "sha512-V4aYg89jEoVRxRb2fJdAg8FHvI7cEyYdVAh94HH0UIK8oJxUfkjlDQN9RbMx+bEjP7+ggMiFRprSti032Oipxw=="
+    }
+  }
+}
diff --git a/packages/isomorphic-unfetch/package.json b/packages/isomorphic-unfetch/package.json
index 0d544d0..ae66aa7 100644
--- a/packages/isomorphic-unfetch/package.json
+++ b/packages/isomorphic-unfetch/package.json
@@ -7,12 +7,13 @@
     "index.d.ts",
     "browser.js"
   ],
+  "license": "MIT",
   "repository": "developit/unfetch",
   "browser": "browser.js",
   "main": "index.js",
   "types": "index.d.ts",
   "dependencies": {
-    "node-fetch": "^2.2.0",
+    "node-fetch": "^2.6.1",
     "unfetch": "^4.0.0"
   }
 }
diff --git a/polyfill/package.json b/polyfill/package.json
index edcbbda..9811fbc 100644
--- a/polyfill/package.json
+++ b/polyfill/package.json
@@ -1,5 +1,5 @@
 {
   "name": "unfetch-polyfill",
   "main": "index.js",
-  "module": "polyfill.mjs"
+  "module": "polyfill.module.js"
 }
diff --git a/polyfill/polyfill.mjs b/polyfill/polyfill.mjs
index e705e65..3ed0e73 100644
--- a/polyfill/polyfill.mjs
+++ b/polyfill/polyfill.mjs
@@ -1,2 +1,2 @@
-import unfetch from '../src/index.mjs';
+import unfetch from '..';
 if (!self.fetch) self.fetch = unfetch;
diff --git a/src/index.d.ts b/src/index.d.ts
index 39162e8..7d582fa 100644
--- a/src/index.d.ts
+++ b/src/index.d.ts
@@ -14,6 +14,33 @@ declare namespace unfetch {
   export type IsomorphicRequestInit = RequestInit | NodeRequestInit;
 }
 
-declare const unfetch: typeof fetch;
+type UnfetchResponse = {
+	ok: boolean,
+	statusText: string,
+	status: number,
+	url: string,
+	text: () => Promise<string>,
+	json: () => Promise<any>,
+	blob: () => Promise<Blob>,
+	clone: () => UnfetchResponse,
+	headers: {
+		keys: () => string[],
+		entries: () => Array<[string, string]>,
+		get: (key: string) => string | undefined,
+		has: (key: string) => boolean,
+	}
+}
+
+type Unfetch = (
+	url: string,
+	options?: {
+		method?: string,
+		headers?: Record<string, string>,
+		credentials?: 'include' | 'omit',
+		body?: Parameters<XMLHttpRequest["send"]>[0]
+	}
+) => Promise<UnfetchResponse>
+
+declare const unfetch: Unfetch;
 
 export default unfetch;
diff --git a/src/index.mjs b/src/index.mjs
index 783ad42..96066f6 100644
--- a/src/index.mjs
+++ b/src/index.mjs
@@ -12,7 +12,7 @@ export default function(url, options) {
 			status: request.status,
 			url: request.responseURL,
 			text: () => Promise.resolve(request.responseText),
-			json: () => Promise.resolve(JSON.parse(request.responseText)),
+			json: () => Promise.resolve(request.responseText).then(JSON.parse),
 			blob: () => Promise.resolve(new Blob([request.response])),
 			clone: response,
 			headers: {