WebStorm ES6 syntax settings and introduction to babel usage

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1. Grammar support settings

##Preferences > Languages ​​& Frameworks > JavaScript

2. Babel installation

1. Global installation

 npm install -g babel-cli

2. Current project, applicable to situations where different babel versions are used

 npm install --save-dev babel-cli

3. Basic usage of Babel

# 转码结果输出到标准输出
 babel example.js

# 转码结果写入一个文件
# --out-file 或 -o 参数指定输出文件
 babel example.js --out-file compiled.js
# 或者
 babel example.js -o compiled.js

# 整个目录转码
# --out-dir 或 -d 参数指定输出目录
 babel src --out-dir lib
# 或者
 babel src -d lib

# -s 参数生成source map文件
 babel src -d lib -s

4. Using babel in webstorm

0. Create a new test.js file , used as a test case

input.map(item => item + 1);

1. A file needs to be added to the project: package.json

{ "name": "application-name", "version": "0.0.1"}

2 , In the current project, install babel

npm install --save-dev babel-cli

3. Use the File Watcher function that comes with WebStorm

Preferences > Tools > File Watchers, click right Click the + sign on the side, select babel, and click OK.

After the operation is completed, if you modify the JS code at this time, you will find that a test-compiled.js file is generated synchronously. After opening, you will find that the code is consistent with the test.js code.

You also need to configure transcoding rules, continue reading below. ↓↓↓

#4. Add the configuration file

.babelrc<span style="color:#000000;font-family:NSimsun"></span>Babel’s configuration file is

.babelrc<span style="font-family:NSimsun">, stored in the root directory of the project. The first step in using Babel is to configure this file. </span>This file is used to set transcoding rules and plug-ins. The basic format is as follows.

{ "presets": [], "plugins": []}

5. Set the transcoding rules

presets<span style="font-family:NSimsun"> field to set the transcoding rules , the official provides the following rule sets, you can install them according to your needs. </span>

# ES2015转码规则
npm install --save-dev babel-preset-es2015

# react转码规则
npm install --save-dev babel-preset-react

# ES7不同阶段语法提案的转码规则（共有4个阶段），选装一个
npm install --save-dev babel-preset-stage-0
npm install --save-dev babel-preset-stage-1
npm install --save-dev babel-preset-stage-2
npm install --save-dev babel-preset-stage-3

We need to install es2015, the command is as follows:

npm install --save-dev babel-preset-es2015

6. Update the configuration file.babelrc

Save the corresponding rules to the configuration file.

{
 "presets": [
 "es2015"
 ],
 "plugins": []
}

7. Complete, check the effect

After the above steps are completed, you can automatically convert the ES6 code to ES5 after modifying the code.

5. Use the command to manually compile the code1. Change the package.json file

{
 "name": "application-name",
 "version": "0.0.1",
 "devDependencies": {
 "babel-cli": "^6.26.0" 
 },
 "scripts": {
 "build": "babel src -d lib"
 }
}

2. Use the command to generate ES5 code

npm run build

3. The effect

will be The code in the directory is compiled into the lib directory.

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