types: setup tests for built d.ts files

package.json

@@ -10,7 +10,12 @@
     "size-compiler": "node scripts/build.js compiler-dom -p -f global",
     "size": "yarn size-runtime && yarn size-compiler",
     "lint": "prettier --write --parser typescript \"packages/**/*.ts?(x)\"",
-    "test": "jest"
+    "test": "jest",
+    "test-dts": "node scripts/build.js reactivity runtime-core runtime-dom -t -f esm && tsd"
+  },
+  "types": "test-dts/index.d.ts",
+  "tsd": {
+    "directory": "test-dts"
   },
   "gitHooks": {
     "pre-commit": "lint-staged",
@@ -45,7 +50,8 @@
     "rollup-plugin-terser": "^5.1.1",
     "rollup-plugin-typescript2": "^0.24.0",
     "ts-jest": "^24.0.2",
-    "typescript": "^3.5.3",
+    "tsd": "^0.10.0",
+    "typescript": "^3.6.4",
     "yorkie": "^2.0.0"
   }
 }