即使在Webstorm 2018.3中配置了Babel之后，Spread Operator也会引发SyntaxError

时间：2019-01-03 16:29:14

标签： node.js webstorm babel

Webstorm /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

    我通过以下步骤添加了Babel

  2. 对于本地存储库，我安装了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配置了运行配置，因为我的package.json中有"start": nodemon app.js。

应用程序

我正在使用mongoose存储和从MongoDB获取信息，并使用GraphQL为查询/变异提供端点

这是我代码中的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 ...

步骤再次出现

根据SE Query to Configure Babel with Webstorm for node.js project，我尝试创建一个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，代码可以正常工作，但是我希望在其他代码块中使用散布运算符。

我知道该错误与Webstorm无关，但是我看不到该问题的其他替代方法

编辑

文件监视程序Babel File Watcher for WebStorm

NPM配置 NPM Configuration

Node.js配置 通过右键单击app.js文件和菜单中的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 Node JS configuration

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

我添加了一些怪异的babel软件包，以进行一些迫切的尝试，以使其启动并运行，这些软件包位于dev-dependencies

中 
{
  "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"
  }
}

1 个答案:

答案 0 :(得分：1)

我精简了您的示例，并添加了启动和运行它所需的最低版本。

基本上，您缺少的是babel实际去编译代码的部分。我不知道webstorm是否为您做到了，我正在使用VS代码。

.babelrc ：

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

package.json （仅使用deps和脚本，其余内容省略）：

"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 app.js ：

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

您可以使用最新版本来避免不得不移植nodejs代码的麻烦。从8.6.0版开始的节点中支持扩展运算符：https://node.green/#ES2018-features-object-rest-spread-properties

希望有帮助！

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