Question

  {
  "name": "package.js",
  "version": "1.0.0",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "dev": "babel-watch server.js"
  },
  "dependencies": {
    "babel-core": "^6.26.3",
    "expo": "^26.0.0",
    "react": "16.3.0-alpha.1",
    "react-native": "https://github.com/expo/react-native/archive/sdk-26.0.0.tar.gz"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-preset-react": "^6.24.1",
    "babel-watch": "^2.0.7"
  },
  "depencies": {
    "apollo-server-express": "^1.3.2",
    "express": "^4.16.2",
    "graphql": "^0.13.0",
    "graphql-tools": "^2.20.2"
  }
}

执行npm run dev后显示的错误。错误日志如下。我对GraphQL，Apollo和Angular相当陌生。

20 error code ELIFECYCLE
21 error errno 1
22 error backend@1.0.0 dev: `babel-watch server.js`
22 error Exit status 1
23 error Failed at the backend@1.0.0 dev script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]

如果我缺少任何其他文件，请随时在评论中提问。

Server.Js

import express from 'express';
import bodyParser from 'body-parser';
import { graphqlExpress } from 'apollo-server-express';

const app = express();

app.get('/', (req, res) => res.send('Hello World'));

app.listen(4000, () => console.log('Express server running on port 4000'));

Answer 1

似乎缺少软件包babel-preset-env，只需与npm install babel-preset-env一起安装。

如果这不能解决问题，可能是因为您在另一个命令行中有另一个npm实例。检查同一端口中是否还有其他npm在运行。还要删除node_modules并清理缓存npm cache clean，然后重新安装节点模块（npm install）。

错误：找不到相对于目录的预设“ env”

1 个答案: