feat: tsconfig.json polyfill configuration (#7)

README.md

@@ -22,6 +22,15 @@ import '@tsmetadata/polyfill';
 
 After doing so, `Symbol.metadata` will be defined.
 
+You may also need to configure your `tsconfig.json` to target <= ES2022 and include the `esnext.decorators` library. The easiest way to do this is to extend our included polyfill-ready configuration.
+
+```json
+{
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "extends": ["@tsmetadata/polyfill/tsconfig.json"],
+}
+```
+
 ## 🙏 Thanks
 
 Special thanks to Oleksandr Tarasiuk for implementing decorator metadata and to Andrew Branch for releasing an early version of this polyfill.

package.json

@@ -12,8 +12,11 @@
   "publishConfig": {
     "access": "public"
   },
-  "main": "./lib/index.js",
   "types": "./lib/index.d.ts",
+  "exports": {
+    ".": "./lib/index.js",
+    "./tsconfig.json": "./lib/tsconfig.polyfill.json"
+  },
   "scripts": {
     "build": "npm run clean && tsc && cp ./src/*.json ./lib",
     "clean": "rm -rf ./lib",