Implicitly declared global JavaScript variable

Reports an implicit declaration of a global variable.

Example:

  var aaa = 1; // good
  bbb = 2; // bad, if bbb is not declared with 'var' somewhere

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

JSUndeclaredVariable

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | JavaScript and TypeScript | General

Inspection ID: JSUndeclaredVariable

Inspection options

Here you can find the description of settings available for the Implicitly declared global JavaScript variable inspection, and the reference of their default values.

Check assignments in global scope

Option ID:

myCheckGlobalDefinitions

Default value:

Not selected

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection JSUndeclaredVariable

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

Inspection Details
By default bundled with:	CLion 2025.2, GoLand 2025.2, IntelliJ IDEA 2025.2, JetBrains Rider 2025.2, PhpStorm 2025.2, PyCharm 2025.2, Qodana for .NET 2025.2, Qodana for Go 2025.2, Qodana for JS 2025.2, Qodana for JVM 2025.2, Qodana for PHP 2025.2, Qodana for Ruby 2025.2, RubyMine 2025.2, WebStorm 2025.2

Last modified: 18 September 2025