Generate and expose a declaration file

So that TS projects can actually use our types.

Author: rylnd

package.json

@@ -17,6 +17,7 @@
   "author": "",
   "license": "MIT",
   "main": "dist/index.js",
+  "types": "dist/index.d.ts",
   "files": [
     "dist"
   ],

tsconfig.json

@@ -1,15 +1,13 @@
 {
   "compilerOptions": {
     "module": "commonjs",
+    "declaration": true,
     "esModuleInterop": true,
     "target": "es6",
     "noImplicitAny": false,
     "moduleResolution": "node",
     "outDir": "dist",
-    "baseUrl": ".",
-    "paths": {
-      "*": ["node_modules/*", "src/types/*"]
-    }
+    "baseUrl": "."
   },
   "include": ["src/**/*"]
 }