PolySymbol property type mismatch

Reports Kotlin properties and fields annotated with @PolySymbol.Property where the declared type is not assignable to the expected PolySymbol property type.

PolySymbol properties must return a type that is assignable to the type parameter of the corresponding PolySymbolProperty class.

For example, if JSPropertySignatureProperty expects PropertySignature, then the annotated property must return PropertySignature or a subtype of it.

Example:

  @PolySymbol.Property(JSPropertySignatureProperty::class)
  private val propertySignature: TypeScriptTypeMember // Error: TypeScriptTypeMember is not assignable to PropertySignature
    get() = source

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.

KotlinPolySymbolPropertyType

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 | Plugin DevKit | Code

Inspection ID: KotlinPolySymbolPropertyType

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 KotlinPolySymbolPropertyType

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

IntelliJ IDEA 2026.1

Inspection Details
By default bundled with:	IntelliJ IDEA 2026.1, Qodana for JVM 2026.1,

Last modified: 31 March 2026