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Narrowed type

Reports a usage of a variable where the variable type is narrowed by a type guard. Note that severity level doesn't affect this inspection.

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.

TypeScriptSmartCast
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 | TypeScript

Inspection ID: TypeScriptSmartCast

Inspection options

Here you can find the description of settings available for the Narrowed type inspection, and the reference of their default values.

Set up font and background

Default value:

None

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 TypeScriptSmartCast

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

Last modified: 18 September 2025