即使在 Webstorm 2018.3 中的 Babel 配置之后，Spread Operator 也会抛出 SyntaxError

Question

网络风暴/操作系统

Webstorm 2018.3/Windows 10

节点/NPM

v8.0.0/6.4.1

遵循的步骤

1. JetBrains ECMAScript6 in Webstorm Babel FileWatcher

   我通过步骤添加了Babel

2. 对于我安装的本地存储库npm i --save-dev @babel/cli @babel/core @babel/preset-env @babel/plugin-object-proposed-rest-spread

3. 在根文件夹中添加了.babelrc，内容如下：

    {
      "presets": ["@babel/preset-env"],
      "plugins": ["@babel/plugin-proposal-object-rest-spread"]
    }
   

4. 为npm start 配置了我的运行配置，因为我的package.json 中包含"start": nodemon app.js。

应用

我正在使用mongoose 来存储和获取来自 MongoDB 的信息，并使用 GraphQL 为查询/变异提供端点

这是我的代码中的mutation（函数）之一：

 createEvent: (args) => {
            const event = new Event({
               title: args.eventInput.title,
               description: args.eventInput.description,
               price: +args.eventInput.price,
               date: new Date(args.eventInput.date)
            });
            return event
                .save()
                .then(result => {
                    console.log(result);
                    return { ...result._doc };
                })
                .catch(err => {
                    console.log(err);
                    throw err;
                });
        }

错误：

SyntaxError: Unexpected token ...

再次遵循的步骤

根据SE Query to Configure Babel with Webstorm for node.js project，我尝试创建node.js app，但现在出现错误：

 Error: querySrv ENOTFOUND _mongodb._tcp.undefined-p8e7q.mongodb.net
  at errnoException (dns.js:50:10)
    at QueryReqWrap.onresolve [as oncomplete] (dns.js:244:19)
  code: 'ENOTFOUND',
  errno: 'ENOTFOUND',
  syscall: 'querySrv',
  hostname: '_mongodb._tcp.undefined-p8e7q.mongodb.net' 

我现在将 { ...result._doc } 替换为 return result._doc 并且代码工作正常，但我希望在其他代码块中使用扩展运算符。

我了解该错误与 Webstorm 无关，但我没有看到此问题的任何其他替代方法

编辑

File Watcher Babel

NPM 配置

Node.js 配置 通过右键单击菜单中的app.js 文件和Create 'app.js' 创建。我安装了npm i --save-dev @babel/register并将其更改为-r @babel/register，如博客中所述

app.js

const express = require('express'); // Add Express Module
const bodyParser = require('body-parser'); // Add Body-Parser Middleware for JSON handling in Requests
const graphqlHttp = require('express-graphql'); // Add Middleware for GraphQL Resolvers over Express HTTP
const { buildSchema } = require('graphql'); // Javascript Object-Destructuring (pull objects from packages)
const mongoose = require('mongoose'); // MongoDB Third-Party package


const Event = require('./models/event'); // MongoDB Event Model

const app = express();

app.use(bodyParser.json()); // JSON parsing Middleware added

app.use('/graphql', graphqlHttp({
    schema: buildSchema(`
        type Event {
            _id: ID!
            title: String!
            description: String!
            price: Float!
            date: String!
        }

        input EventInput {
            title: String!
            description: String!
            price: Float!
            date: String!
        }

        type RootQuery {
            events: [Event!]!
        }

        type RootMutation {
            createEvent(eventInput: EventInput): Event
        }

        schema {
            query: RootQuery
            mutation: RootMutation
        }
    `),
    rootValue: {
        events: () => {
            return Event.find()
                .then(events => {
                    return events.map( event => {
                        event._doc._id = event.id;
                        return event._doc;
                    });
                })
                .catch(err => {
                    console.log(err);
                    throw err;
                })
        },
        createEvent: (args) => {
            const event = new Event({
               title: args.eventInput.title,
               description: args.eventInput.description,
               price: +args.eventInput.price,
               date: new Date(args.eventInput.date)
            });
            return event
                .save()
                .then(result => {
                    console.log(result);
                    return { ...result._doc };
                    // return result._doc
                })
                .catch(err => {
                    console.log(err);
                    throw err;
                });

        }
    },
    graphiql: true
}));

mongoose.connect(
    `mongodb+srv://${process.env.MONGO_USER}:${process.env.MONGO_PASSWORD}@${process.env.MONGO_CLUSTER_NAME}-p8e7q.mongodb.net/${process.env.MONGO_DB_NAME}?retryWrites=true`)
    .then( () => {
        app.listen(3000);
    }).catch(err => {
        console.log(err);
    });

package.json

我添加了一些奇怪的 babel 包，以试图启动并运行它，位于 dev-dependencies

{
  "name": "graphql-express-app",
  "version": "0.0.4",
  "description": "Academind's YouTube Series on GraphQL-Express-React",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "nodemon app.js"
  },
  "keywords": [
    "graphql",
    "express",
    "node.js"
  ],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@babel/preset-stage-2": "^7.0.0",
    "babel-preset-stage-2": "^6.24.1",
    "body-parser": "^1.18.3",
    "express": "^4.16.4",
    "express-graphql": "^0.7.1",
    "graphql": "^14.0.2",
    "mongoose": "^5.4.1"
  },
  "devDependencies": {
    "@babel/cli": "^7.2.3",
    "@babel/core": "^7.2.2",
    "@babel/plugin-proposal-object-rest-spread": "^7.2.0",
    "@babel/preset-env": "^7.2.3",
    "@babel/register": "^7.0.0",
    "babel-cli": "^6.26.0",
    "babel-plugin-transform-es2015-destructuring": "^6.23.0",
    "babel-plugin-transform-object-rest-spread": "^6.26.0",
    "nodemon": "^1.18.9"
  }
}

Answer 1

我删除了您的示例，并添加了启动和运行所需的最小版本。

基本上，您缺少的是 babel 实际运行并转译您的代码的部分。不知道webstorm有没有给你做，我用的是VS code。

.babelrc：

{
    "presets": ["@babel/preset-env"],
    "plugins": ["@babel/plugin-proposal-object-rest-spread"]
}

package.json（仅限部门和脚本，其余省略）：

"scripts": {
  "test": "echo \"Error: no test specified\" && exit 1",
  "start": "nodemon --exec babel-node app.js"
},
"devDependencies": {
  "@babel/core": "^7.2.2",
  "@babel/node": "^7.2.2",
  "@babel/plugin-proposal-object-rest-spread": "^7.2.0",
  "@babel/preset-env": "^7.2.3",
  "nodemon": "^1.18.9"
}

最小的app.js：

const o = {
  a: 'a',
  b: 'b',
};
const o2 = { ...o };
console.log(o2);
// Outputs: { a: 'a', b: 'b' }

您可以通过使用最新版本来避免转换 nodejs 代码。从 8.6.0 版本开始，节点支持扩展运算符：https://node.green/#ES2018-features-object-rest-spread-properties

希望有帮助！