Remove flow type cache

src/compiler/checker.ts

@@ -419,7 +419,6 @@ import {
     ImportOrExportSpecifier,
     ImportSpecifier,
     ImportTypeNode,
-    IncompleteType,
     IndexedAccessType,
     IndexedAccessTypeNode,
     IndexFlags,
@@ -1955,7 +1954,6 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
     var subtypeReductionCache = new Map<string, Type[]>();
     var decoratorContextOverrideTypeCache = new Map<string, Type>();
     var cachedTypes = new Map<string, Type>();
-    var incompleteTypes: IncompleteType[] = [];
     var evolvingArrayTypes: EvolvingArrayType[] = [];
     var undefinedProperties: SymbolTable = new Map();
     var markerTypes = new Set<number>();
@@ -27520,9 +27518,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
     }
 
     function createFlowType(type: Type, incomplete: boolean): FlowType {
-        return incomplete ?
-            (incompleteTypes[type.id] ??= { flags: 0, type: type.flags & TypeFlags.Never ? silentNeverType : type }) :
-            type;
+        return incomplete ? { flags: 0, type: type.flags & TypeFlags.Never ? silentNeverType : type } : type;
     }
 
     // An evolving array type tracks the element types that have so far been seen in an