test postinstall 1

Author: milahu

package.json

@@ -19,7 +19,8 @@
     "clean": "rimraf dist patch-package.test*.tgz",
     "format": "prettier --no-semi --write --trailing-comma=all src{/**,}/*.ts integration-tests{/**,}/*.ts property-based-tests{/**,}/*.ts",
     "prepack": "rimraf dist/**/*.test.js",
-    "test": "./run-tests.sh --runInBand"
+    "test": "./run-tests.sh --runInBand",
+    "postinstall": "npm-run-all build"
   },
   "husky": {
     "hooks": {
@@ -85,7 +86,8 @@
     "semver": "^5.6.0",
     "shlex": "^2.0.2",
     "slash": "^2.0.0",
-    "tmp": "^0.0.33"
+    "tmp": "^0.0.33",
+    "npm-run-all": "*"
   },
   "files": [
     "index.js",