fix: include TS types in bundle

Author: SimenB

package.json

@@ -8,7 +8,8 @@
   "files": [
     "lib/"
   ],
-  "main": "lib/",
+  "main": "lib/index.js",
+  "types": "lib/index.d.ts",
   "engines": {
     "node": ">=8"
   },

tsconfig.json

@@ -3,11 +3,15 @@
     "module": "commonjs",
     "moduleResolution": "node",
     "jsx": "react",
-    "noEmit": true,
+    "declaration": true,
+    "emitDeclarationOnly": true,
+    "isolatedModules": true,
     "noImplicitReturns": true,
     "strict": true,
     "esModuleInterop": true,
-    "forceConsistentCasingInFileNames": true
+    "forceConsistentCasingInFileNames": true,
+    "outDir": "lib/"
   },
-  "include": ["src/**/*"]
+  "include": ["src/**/*"],
+  "exclude": ["**/__tests__/**"]
 }