[JS IR] Respect JsExport while assigning stable names

see https://youtrack.jetbrains.com/issue/KT-43404

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrUtils.kt

@@ -397,7 +397,7 @@ fun IrClass.createImplicitParameterDeclarationWithWrappedDescriptor() {
 @Suppress("UNCHECKED_CAST")
 fun isElseBranch(branch: IrBranch) = branch is IrElseBranch || ((branch.condition as? IrConst<Boolean>)?.value == true)
 
-fun IrSimpleFunction.isMethodOfAny() =
+fun IrFunction.isMethodOfAny() =
     ((valueParameters.size == 0 && name.asString().let { it == "hashCode" || it == "toString" }) ||
             (valueParameters.size == 1 && name.asString() == "equals" && valueParameters[0].type.isNullableAny()))
 

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/BridgesConstruction.kt

@@ -15,7 +15,7 @@ import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.backend.js.JsCommonBackendContext
 import org.jetbrains.kotlin.ir.backend.js.JsLoweredDeclarationOrigin
-import org.jetbrains.kotlin.ir.backend.js.utils.getJsName
+import org.jetbrains.kotlin.ir.backend.js.utils.hasStableJsName
 import org.jetbrains.kotlin.ir.backend.js.utils.realOverrideTarget
 import org.jetbrains.kotlin.ir.builders.*
 import org.jetbrains.kotlin.ir.builders.declarations.buildFun
@@ -118,7 +118,7 @@ abstract class BridgesConstruction(val context: JsCommonBackendContext) : Declar
     ): IrFunction {
 
         val origin =
-            if (bridge.isEffectivelyExternal() || bridge.getJsName() != null)
+            if (bridge.hasStableJsName())
                 JsLoweredDeclarationOrigin.BRIDGE_TO_EXTERNAL_FUNCTION
             else
                 IrDeclarationOrigin.BRIDGE

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NameTables.kt

@@ -109,20 +109,13 @@ fun jsFunctionSignature(declaration: IrFunction): Signature {
     require(declaration.dispatchReceiverParameter != null)
 
     val declarationName = declaration.getJsNameOrKotlinName().asString()
-    val stableName = StableNameSignature(declarationName)
 
-    if (declaration.origin == JsLoweredDeclarationOrigin.BRIDGE_TO_EXTERNAL_FUNCTION) {
-        return stableName
-    }
-    if (declaration.isEffectivelyExternal()) {
-        return stableName
-    }
-    if (declaration.getJsName() != null) {
-        return stableName
-    }
-    // Handle names for special functions
-    if (declaration is IrSimpleFunction && declaration.isMethodOfAny()) {
-        return stableName
+    val needsStableName = declaration.origin == JsLoweredDeclarationOrigin.BRIDGE_TO_EXTERNAL_FUNCTION ||
+            declaration.hasStableJsName() ||
+            (declaration as? IrSimpleFunction)?.isMethodOfAny() == true // Handle names for special functions
+
+    if (needsStableName) {
+        return StableNameSignature(declarationName)
     }
 
     val nameBuilder = StringBuilder()

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/misc.kt

@@ -15,11 +15,29 @@ import org.jetbrains.kotlin.ir.expressions.impl.IrVarargImpl
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.types.isNullableAny
 import org.jetbrains.kotlin.ir.types.isUnit
+import org.jetbrains.kotlin.ir.util.isEffectivelyExternal
 import org.jetbrains.kotlin.ir.util.isTopLevelDeclaration
+import org.jetbrains.kotlin.ir.util.parentClassOrNull
 import org.jetbrains.kotlin.name.Name
 
 fun TODO(element: IrElement): Nothing = TODO(element::class.java.simpleName + " is not supported yet here")
 
+fun IrFunction.hasStableJsName(): Boolean {
+    val namedOrMissingGetter = when (this) {
+        is IrSimpleFunction -> {
+            val owner = correspondingPropertySymbol?.owner
+            if (owner == null) {
+                true
+            } else {
+                owner.getter?.getJsName() != null
+            }
+        }
+        else -> true
+    }
+
+    return (isEffectivelyExternal() || getJsName() != null || parentClassOrNull?.isJsExport() == true) && namedOrMissingGetter
+}
+
 fun IrFunction.isEqualsInheritedFromAny() =
     name == Name.identifier("equals") &&
             dispatchReceiverParameter != null &&