[FIR JS] Implement FirJsInheritanceChecker

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDataClassConverters.kt

@@ -4648,6 +4648,25 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirJsErrors.IMPLEMENTING_FUNCTION_INTERFACE) { firDiagnostic ->
+        ImplementingFunctionInterfaceImpl(
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
+    add(FirJsErrors.OVERRIDING_EXTERNAL_FUN_WITH_OPTIONAL_PARAMS) { firDiagnostic ->
+        OverridingExternalFunWithOptionalParamsImpl(
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
+    add(FirJsErrors.OVERRIDING_EXTERNAL_FUN_WITH_OPTIONAL_PARAMS_WITH_FAKE) { firDiagnostic ->
+        OverridingExternalFunWithOptionalParamsWithFakeImpl(
+            firSymbolBuilder.functionLikeBuilder.buildFunctionSymbol(firDiagnostic.a),
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirJsErrors.DELEGATION_BY_DYNAMIC) { firDiagnostic ->
         DelegationByDynamicImpl(
             firDiagnostic as KtPsiDiagnostic,

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -3233,6 +3233,19 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = JavaSamInterfaceConstructorReference::class
     }
 
+    abstract class ImplementingFunctionInterface : KtFirDiagnostic<KtClassOrObject>() {
+        override val diagnosticClass get() = ImplementingFunctionInterface::class
+    }
+
+    abstract class OverridingExternalFunWithOptionalParams : KtFirDiagnostic<KtElement>() {
+        override val diagnosticClass get() = OverridingExternalFunWithOptionalParams::class
+    }
+
+    abstract class OverridingExternalFunWithOptionalParamsWithFake : KtFirDiagnostic<KtElement>() {
+        override val diagnosticClass get() = OverridingExternalFunWithOptionalParamsWithFake::class
+        abstract val function: KtFunctionLikeSymbol
+    }
+
     abstract class DelegationByDynamic : KtFirDiagnostic<KtElement>() {
         override val diagnosticClass get() = DelegationByDynamic::class
     }

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -3911,6 +3911,22 @@ internal class JavaSamInterfaceConstructorReferenceImpl(
     override val token: KtLifetimeToken,
 ) : KtFirDiagnostic.JavaSamInterfaceConstructorReference(), KtAbstractFirDiagnostic<PsiElement>
 
+internal class ImplementingFunctionInterfaceImpl(
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.ImplementingFunctionInterface(), KtAbstractFirDiagnostic<KtClassOrObject>
+
+internal class OverridingExternalFunWithOptionalParamsImpl(
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.OverridingExternalFunWithOptionalParams(), KtAbstractFirDiagnostic<KtElement>
+
+internal class OverridingExternalFunWithOptionalParamsWithFakeImpl(
+    override val function: KtFunctionLikeSymbol,
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.OverridingExternalFunWithOptionalParamsWithFake(), KtAbstractFirDiagnostic<KtElement>
+
 internal class DelegationByDynamicImpl(
     override val firDiagnostic: KtPsiDiagnostic,
     override val token: KtLifetimeToken,