diff --git a/package.json b/package.json
index c5ba342..fabf739 100644
--- a/package.json
+++ b/package.json
@@ -15,10 +15,12 @@
   },
   "exports": {
     ".": {
+      "types": "./src/index.d.ts",
       "import": "./index.mjs",
       "default": "./index.js"
     },
     "./polyfill": {
+      "types": "./polyfill/polyfill.d.ts",
       "default": "./polyfill/index.js"
     },
     "./package.json": "./package.json",
diff --git a/packages/isomorphic-unfetch/package.json b/packages/isomorphic-unfetch/package.json
index ff2dc75..a7ba853 100644
--- a/packages/isomorphic-unfetch/package.json
+++ b/packages/isomorphic-unfetch/package.json
@@ -4,6 +4,7 @@
   "description": "Switches between unfetch & node-fetch for client & server.",
   "exports": {
     ".": {
+      "types": "./index.d.ts",
       "import": "./index.mjs",
       "default": "./index.js"
     },
diff --git a/polyfill/polyfill.d.ts b/polyfill/polyfill.d.ts
new file mode 100644
index 0000000..336ce12
--- /dev/null
+++ b/polyfill/polyfill.d.ts
@@ -0,0 +1 @@
+export {}