fix(KT-38262): add ability to create classes with methods that have reserved keyword as an identifier.

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/export/ExportModelGenerator.kt

@@ -588,7 +588,7 @@ class ExportModelGenerator(
 
         val name = function.getExportedIdentifier()
         // TODO: Use [] syntax instead of prohibiting
-        if (name in allReservedWords)
+        if (parentClass == null && name in allReservedWords)
             return Exportability.Prohibited("Name is a reserved word")
 
         return Exportability.Allowed

js/js.translator/testData/typescript-export/declarations/declarations.d.ts

@@ -162,5 +162,10 @@ declare namespace JS_TESTS {
                 get ordinal(): 0 | 1;
             }
         }
+        class KT38262 {
+            constructor();
+            then(): number;
+            catch(): number;
+        }
     }
 }

js/js.translator/testData/typescript-export/declarations/declarations.kt

@@ -213,4 +213,10 @@ class OuterClass {
         A,
         B
     }
+}
+
+@JsExport
+class KT38262 {
+    fun then(): Int = 42
+    fun catch(): Int = 24
 }

js/js.translator/testData/typescript-export/declarations/declarations__main.js

@@ -30,6 +30,7 @@ var TestEnumClass = JS_TESTS.foo.TestEnumClass;
 var TestInterfaceImpl = JS_TESTS.foo.TestInterfaceImpl;
 var processInterface = JS_TESTS.foo.processInterface;
 var OuterClass = JS_TESTS.foo.OuterClass;
+var KT38262 = JS_TESTS.foo.KT38262;
 function assert(condition) {
     if (!condition) {
         throw "Assertion failed";
@@ -126,5 +127,7 @@ function box() {
     assert(OuterClass.NestedEnum.B.name === "B");
     assert(OuterClass.NestedEnum.A.ordinal === 0);
     assert(OuterClass.NestedEnum.B.ordinal === 1);
+    assert(new KT38262().then() == 42);
+    assert(new KT38262().catch() == 24);
     return "OK";
 }

js/js.translator/testData/typescript-export/declarations/declarations__main.ts

@@ -30,6 +30,7 @@ import TestEnumClass = JS_TESTS.foo.TestEnumClass;
 import TestInterfaceImpl = JS_TESTS.foo.TestInterfaceImpl;
 import processInterface = JS_TESTS.foo.processInterface;
 import OuterClass = JS_TESTS.foo.OuterClass;
+import KT38262 = JS_TESTS.foo.KT38262;
 
 function assert(condition: boolean) {
     if (!condition) {
@@ -152,5 +153,8 @@ function box(): string {
     assert(OuterClass.NestedEnum.A.ordinal === 0)
     assert(OuterClass.NestedEnum.B.ordinal === 1)
 
+    assert(new KT38262().then() == 42)
+    assert(new KT38262().catch() == 24)
+
     return "OK";
 }