JavaScript environments contain a number of built-in global variables, such as window in browsers and process in Node.js. In almost all cases, you don't want to assign a value to these global variables as doing so could result in losing access to important functionality. For example, you probably don't want to do this in browser code:

window = {};

While examples such as window are obvious, there are often hundreds of built-in global objects provided by JavaScript environments. It can be hard to know if you're assigning to a global variable or not.

Rule Details

This rule disallows modifications to read-only global variables.

Examples of incorrect code for this rule:

/*eslint no-global-assign: "error"*/

Object = null
undefined = 1

http://eslint.org/docs/rules/no-global-assign

Likely to be uncontroversial. No repos fail. Will merge into standard v8 beta.