fix

Author: cspotcode

src/resolver-functions.ts

@@ -98,17 +98,16 @@ export function createResolverFunctions(kwargs: {
       optionsOnlyWithNewerTsVersions: TSCommon.CompilerOptions,
       containingSourceFile?: TSCommon.SourceFile
     ): (TSCommon.ResolvedModule | undefined)[] => {
-      return moduleNames.map((moduleName) => {
+      return moduleNames.map((moduleName, i) => {
+        const mode = containingSourceFile ? (ts as any as TSInternal).getModeForResolutionAtIndex?.(containingSourceFile, i) : undefined;
         const { resolvedModule } = ts.resolveModuleName(
           moduleName,
           containingFile,
           config.options,
           host,
           moduleResolutionCache,
           redirectedReference,
-          containingSourceFile?.impliedNodeFormat
-
-          // (ts as any as typeof import('typescript')).getModeForResolutionAtIndex(containingSourceFile)
+          mode,
         );
         if (resolvedModule) {
           fixupResolvedModule(resolvedModule);

src/ts-compiler-types.ts

@@ -117,6 +117,8 @@ export interface TSInternal {
     basePath: string,
     usage: 'files' | 'directories' | 'exclude'
   ): string | undefined;
+  // Added in TS 4.7
+  getModeForResolutionAtIndex?(file: TSInternal.SourceFileImportsList, index: number): _ts.SourceFile['impliedNodeFormat'];
 }
 /** @internal */
 export namespace TSInternal {
@@ -127,4 +129,8 @@ export namespace TSInternal {
     getCurrentDirectory(): string;
     useCaseSensitiveFileNames: boolean;
   }
+  // Note: is only a partial declaration, TS sources declare other fields
+  export interface SourceFileImportsList {
+    impliedNodeFormat?: TSCommon.SourceFile["impliedNodeFormat"];
+};
 }