[FIR JS] Generate dynamic FIRs via DynamicScope

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/ResolveUtils.kt

@@ -522,6 +522,7 @@ fun FirFunction.getAsForbiddenNamedArgumentsTarget(session: FirSession): Forbidd
             }
         }
         FirDeclarationOrigin.Synthetic -> null
+        FirDeclarationOrigin.DynamicScope -> null
         FirDeclarationOrigin.RenamedForOverride -> null
         FirDeclarationOrigin.WrappedIntegerOperator -> null
         is FirDeclarationOrigin.Plugin -> null // TODO: figure out what to do with plugin generated functions

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/CallKind.kt

@@ -20,6 +20,7 @@ sealed class CallKind(vararg resolutionSequence: ResolutionStage) {
         CheckDslScopeViolation,
         CheckLowPriorityInOverloadResolution,
         PostponedVariablesInitializerResolutionStage,
+        LowerPriorityIfDynamic,
         ConstraintSystemForks,
         CheckIncompatibleTypeVariableUpperBounds,
     )
@@ -53,6 +54,7 @@ sealed class CallKind(vararg resolutionSequence: ResolutionStage) {
         EagerResolveOfCallableReferences,
         CheckLowPriorityInOverloadResolution,
         PostponedVariablesInitializerResolutionStage,
+        LowerPriorityIfDynamic,
         ConstraintSystemForks,
         CheckIncompatibleTypeVariableUpperBounds,
     )

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/FirArgumentsToParametersMapper.kt

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.fir.resolve.calls
 
 import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.declarations.FirDeclarationOrigin
 import org.jetbrains.kotlin.fir.declarations.FirFunction
 import org.jetbrains.kotlin.fir.declarations.FirSimpleFunction
 import org.jetbrains.kotlin.fir.declarations.FirValueParameter
@@ -79,7 +80,11 @@ fun BodyResolveComponents.mapArguments(
 
     // If this is an indexed access set operator, it could have default values or a vararg parameter in the middle.
     // For proper argument mapping, wrap the last one, which is supposed to be the updated value, as a named argument.
-    val isIndexedSetOperator = function is FirSimpleFunction && function.isOperator && function.name == OperatorNameConventions.SET
+    val isIndexedSetOperator = function is FirSimpleFunction
+            && function.isOperator
+            && function.name == OperatorNameConventions.SET
+            && function.origin !is FirDeclarationOrigin.DynamicScope
+
     if (isIndexedSetOperator &&
         function.valueParameters.any { it.defaultValue != null || it.isVararg }
     ) {

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/ResolutionStages.kt

@@ -644,6 +644,14 @@ internal object CheckDeprecatedSinceKotlin : ResolutionStage() {
     }
 }
 
+internal object LowerPriorityIfDynamic : ResolutionStage() {
+    override suspend fun check(candidate: Candidate, callInfo: CallInfo, sink: CheckerSink, context: ResolutionContext) {
+        if (candidate.symbol.origin is FirDeclarationOrigin.DynamicScope) {
+            candidate.addDiagnostic(LowerPriorityForDynamic)
+        }
+    }
+}
+
 internal object ConstraintSystemForks : ResolutionStage() {
     override suspend fun check(candidate: Candidate, callInfo: CallInfo, sink: CheckerSink, context: ResolutionContext) {
         if (candidate.system.hasContradiction) return

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/TypeArgumentMapping.kt

@@ -5,6 +5,8 @@
 
 package org.jetbrains.kotlin.fir.resolve.calls
 
+import org.jetbrains.kotlin.fir.declarations.FirDeclaration
+import org.jetbrains.kotlin.fir.declarations.FirDeclarationOrigin
 import org.jetbrains.kotlin.fir.declarations.FirTypeParameterRefsOwner
 import org.jetbrains.kotlin.fir.types.FirTypeProjection
 import org.jetbrains.kotlin.fir.types.builder.buildPlaceholderProjection
@@ -33,7 +35,11 @@ internal object MapTypeArguments : ResolutionStage() {
 
         val owner = candidate.symbol.fir as FirTypeParameterRefsOwner
 
-        if (typeArguments.size == owner.typeParameters.size || callInfo.callKind == CallKind.DelegatingConstructorCall) {
+        if (
+            typeArguments.size == owner.typeParameters.size ||
+            callInfo.callKind == CallKind.DelegatingConstructorCall ||
+            (owner as? FirDeclaration)?.origin is FirDeclarationOrigin.DynamicScope
+        ) {
             candidate.typeArgumentMapping = TypeArgumentMapping.Mapped(typeArguments)
         } else {
             candidate.typeArgumentMapping = TypeArgumentMapping.Mapped(emptyList())