Use getEmitModuleFormatOfFile for project reference declaration files

Co-authored-by: andrewbranch <[email protected]>

Author: Copilot

src/compiler/checker.ts

@@ -3794,6 +3794,14 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 // are ESM, there cannot be a synthetic default.
                 return false;
             }
+            // For declaration files from project references, check if the referenced project's
+            // emit format is ESM, in which case there cannot be a synthetic default
+            if (file.isDeclarationFile && host.getRedirectFromSourceFile(file.path)) {
+                const targetModuleKind = host.getEmitModuleFormatOfFile(file);
+                if (usageMode === ModuleKind.ESNext && targetModuleKind >= ModuleKind.ES2015) {
+                    return false;
+                }
+            }
         }
         if (!allowSyntheticDefaultImports) {
             return false;
@@ -3812,24 +3820,6 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 // it definitely is a module and does not have a synthetic default
                 return false;
             }
-            // If this is a declaration file from a project reference, check the referenced project's options
-            // to determine if the module format is ESM
-            if (file) {
-                const redirect = host.getRedirectFromSourceFile(file.path);
-                if (redirect?.resolvedRef) {
-                    const referencedOptions = redirect.resolvedRef.commandLine.options;
-                    // If the referenced project has allowSyntheticDefaultImports disabled, respect that
-                    if (!getAllowSyntheticDefaultImports(referencedOptions)) {
-                        return false;
-                    }
-                    // If the referenced project's module format is ESM (ES2015 or later),
-                    // it cannot have a synthetic default
-                    const referencedModuleKind = getEmitModuleKind(referencedOptions);
-                    if (referencedModuleKind >= ModuleKind.ES2015) {
-                        return false;
-                    }
-                }
-            }
             // There are _many_ declaration files not written with esmodules in mind that still get compiled into a format with __esModule set
             // Meaning there may be no default at runtime - however to be on the permissive side, we allow access to a synthetic default member
             // as there is no marker to indicate if the accompanying JS has `__esModule` or not, or is even native esm