eslint.md

Getting Started with ESLint

• install ESLint using npm or yarn:

npm install eslint --save-dev

# or

yarn add eslint --dev

• set up a configuration file

npx eslint --init

• run ESLint on any file or directory

npx eslint yourfile.js

ESLint Formatters

• format sourcecode

npx eslint --format codeframe yourfile.js

• configuration

.eslintrc:
{
    "extends": "eslint:recommended",
    "rules": {
        "consistent-return": 2,
        "indent"           : [1, 4],
        "no-else-return"   : 1,
        "semi"             : [1, "always"],
        "space-unary-ops"  : 2
    }
}

The first value is the error level of the rule and can be one of these values:

• "off" or 0 - turn the rule off
• "warn" or 1 - turn the rule on as a warning (doesn't affect exit code)
• "error" or 2 - turn the rule on as an error (exit code will be 1)

The three error levels allow you fine-grained control over how ESLint applies rules.

• code fix

npx eslint --fix src/js/mcg.js