fix: const declarations inside block to be more aggressive #61734

Author: Sai Chand Sunkara

src/compiler/checker.ts

@@ -41563,7 +41563,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
         }
         switch (kind) {
             case SyntaxKind.Identifier:
-                return checkIdentifier(node as Identifier, checkMode);
+                return checkIdentifier(node as Identifier, checkMode); // ------------------------>>>>>>>>>>>>> should be the 2nd one...............
             case SyntaxKind.PrivateIdentifier:
                 return checkPrivateIdentifierExpression(node as PrivateIdentifier);
             case SyntaxKind.ThisKeyword:
@@ -47457,9 +47457,11 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
     function checkInterfaceDeclaration(node: InterfaceDeclaration) {
         // Grammar checking
         if (!checkGrammarModifiers(node)) checkGrammarInterfaceDeclaration(node);
-        if (!allowBlockDeclarations(node.parent)) {
-            grammarErrorOnNode(node, Diagnostics._0_declarations_can_only_be_declared_inside_a_block, "interface");
-        }
+        addLazyDiagnostic(() => {
+            if (!allowBlockDeclarations(node.parent)) {
+                grammarErrorOnNode(node, Diagnostics._0_declarations_can_only_be_declared_inside_a_block, "interface");
+            }
+        })
 
         checkTypeParameters(node.typeParameters);
         addLazyDiagnostic(() => {
@@ -48882,7 +48884,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
             case SyntaxKind.ClassDeclaration:
                 return checkClassDeclaration(node as ClassDeclaration);
             case SyntaxKind.InterfaceDeclaration:
-                return checkInterfaceDeclaration(node as InterfaceDeclaration);
+                return checkInterfaceDeclaration(node as InterfaceDeclaration); // -------------------->>>>>>>>>>. should be 1st one
             case SyntaxKind.TypeAliasDeclaration:
                 return checkTypeAliasDeclaration(node as TypeAliasDeclaration);
             case SyntaxKind.EnumDeclaration: