electron/docs/development/coding-style.md

Coding Style

These are the style guidelines for coding in Electron.

You can run npm run lint to show any style issues detected by cpplint and eslint.

C++ and Python

For C++ and Python, we follow Chromium's Coding Style. There is also a script script/cpplint.py to check whether all files conform.

The Python version we are using now is Python 2.7.

The C++ code uses a lot of Chromium's abstractions and types, so it's recommended to get acquainted with them. A good place to start is Chromium's Important Abstractions and Data Structures document. The document mentions some special types, scoped types (that automatically release their memory when going out of scope), logging mechanisms etc.

JavaScript

• Use a two space indent, no hard tabs.
• End lines with a ;
• Files should NOT end with new line, because we want to match Google's styles.
• File names should be concatenated with - instead of _, e.g. file-name.js rather than file_name.js, because in github/atom module names are usually in the module-name form. This rule only applies to .js files.
• Use newer ES6/ES2015 syntax where appropriate
  • const for requires and other constants
  • let for defining variables
  • Arrow functions instead of function () { }
  • Template literals instead of string concatenation using +

API Names

When creating a new API, we should prefer getters and setters instead of jQuery's one-function style. For example, .getText() and .setText(text) are preferred to .text([text]). There is a discussion on this.