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no-misused-globals.md

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Disallow global variables that may be misused (no-misused-globals)

In JavaScript, all global variables are properties of the global object and vice versa. This feature leads to times when we accidentally use global variables without noticing them, e.g.

  • Import statement is missing while a method of the same name happens to exist in the global object
  • Moving code without moving the variable declaration, but the variable of the same name happens to be a global variable

This rule tries to check for these cases.

This rule cannot specify global variables. no-restricted-globals can be used if required.

Options

This rule has an object option:

  • "prototypeBuiltins" (default true) disallows properties from the prototype of Object
  • "deprecated" (default true) disallows deprecated global DOM properties and methods
  • "events" (default true) disallows the properties of the global object as an event target
  • "ambiguousSingleWords" (default true) disallows uncommon, ambiguous global variables with single-word names

Fail

if (hasOwnProperty('foo')) {}
event.target.focus()
onbeforeunload = () => false
open(door)

Pass

location.href = ''
setTimeout(foo, 1000)
process.exit()
require('os')