configuring eslint

• configuration comments // eslint-disable-next-line prefer-const
• configuration files .eslintrc.* 可以存放在HOME目录下，就不用每个项目都配置该文件。
• package.json eslintConfig

configuration file format & priority

1. .eslintrc.js
2. .eslintrc.yaml
3. .eslintrc.yml
4. .eslintrc.json
5. .eslintrc deprecated
6. package.json

ignoring files and directory

# omit all .js file
**/*.js 
# Ignore built files except build/index.js
build/*
!build/index.js

eslintrc

• env

    'env': {
        'browser': true,
        // new ES6 global variables,
        'es6': true,
        'node': true
    },

• options

'extends': 'eslint:recommended', // 'airbnb-base' 'standard'
    

• parseOptions

    'parserOptions': {
        // supporting ES6 syntax 
        'ecmaVersion': 6,
        'sourceType': 'module'
    },

• plugins

"html"

• rules

"indent": [
    "error",
    "tab"
],
"linebreak-style": [
    "error",
    "unix"
],
"quotes": [
    "error",
    "single"
],
"semi": [
    "error",
    "always"
]