ESLint

Lightning Talk

Custom Rules

About Me

• Senior Software Engineer at Iteris
• twitter: @bchirgwin
• Organizer of CODE Norman

ESLint

• Linting Tool [JSLint, JSHint]
  • Potential Errors
    • if (a = b)
  • Best Practices
    • require === conditions
  • Style Guidelines
    • comma location

ESLint Installation

• npm install -g eslint
• eslint --init
  • answer questions

Warnings/Errors

• Rules can be set as warning while code is changed
• Set rule to error once all code refactored & CI system can fail on error.

Demo

• http://eslint.org/demo/

Style Guideline Rules

• "max-statements": [2, 2, {"ignoreTopLevelFunctions": true}]

• "max-depth: [2, {"maximum": 2} ]

• "max-len": [2, {"code": 80, "tabWidth": 4, "ignoreUrls": true}]

• "max-params": [2, {"maximum": 2}]

• "complexity": [2, { "maximum": 2 }]

• "max-nested-callbacks": [2, {"maximum": 3}]

Custom Rules

• Write rules to enforce team style guide.
• Optional Fix routine to automatically follow rule.

Code Norman

• Saturday, March 19, 2 - 4 at Norman Public Library
• ESLint