npm install babel-preset-es2015 报错

Question

npm install babel-preset-es2015 报错:npm ERR! Unexpected end of input at 1:66677npm ERR! alpha.19","babel-plugin-transform-es2015-function-name":"7.0.0-alpha.package.json"devDependencies": {    "babel-core": "^6.21.0",    "babel-loader": "^6.2.10",    "babel-preset-stage-1": "^6.24.1",    "webpack": "^3.8.1"  }