message: make sure to delete files that could infer from test/package-test directory
diff: "typechain": "../.."
  },
  "scripts": {
  - "start": "typechain --target=truffle"
  + "start": "typechain --target=truffle",
  + "postinstall": "rm -rf ./node_modules/typechain/test && rm -rf ./node_modules/typechain/lib"
  }
  }
  