diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 32a36306a17d5..641b1b2e7f3c0 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -6629,7 +6629,7 @@ namespace ts {
         readonly includeCompletionsWithInsertText?: boolean;
         readonly importModuleSpecifierPreference?: "auto" | "relative" | "non-relative";
         /** Determines whether we import `foo/index.ts` as "foo", "foo/index", or "foo/index.js" */
-        readonly importModuleSpecifierEnding?: "minimal" | "index" | "js";
+        readonly importModuleSpecifierEnding?: "auto" | "minimal" | "index" | "js";
         readonly allowTextChangesInNewFiles?: boolean;
         readonly providePrefixAndSuffixTextForRename?: boolean;
     }
diff --git a/src/server/protocol.ts b/src/server/protocol.ts
index 5fe3fbd0fa28b..5418f6ccce4a1 100644
--- a/src/server/protocol.ts
+++ b/src/server/protocol.ts
@@ -3131,6 +3131,8 @@ namespace ts.server.protocol {
          */
         readonly includeAutomaticOptionalChainCompletions?: boolean;
         readonly importModuleSpecifierPreference?: "auto" | "relative" | "non-relative";
+        /** Determines whether we import `foo/index.ts` as "foo", "foo/index", or "foo/index.js" */
+        readonly importModuleSpecifierEnding?: "auto" | "minimal" | "index" | "js";
         readonly allowTextChangesInNewFiles?: boolean;
         readonly lazyConfiguredProjectsFromExternalProject?: boolean;
         readonly providePrefixAndSuffixTextForRename?: boolean;
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index dbc336fccce23..87a0ef2017a50 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -3259,7 +3259,7 @@ declare namespace ts {
         readonly includeCompletionsWithInsertText?: boolean;
         readonly importModuleSpecifierPreference?: "auto" | "relative" | "non-relative";
         /** Determines whether we import `foo/index.ts` as "foo", "foo/index", or "foo/index.js" */
-        readonly importModuleSpecifierEnding?: "minimal" | "index" | "js";
+        readonly importModuleSpecifierEnding?: "auto" | "minimal" | "index" | "js";
         readonly allowTextChangesInNewFiles?: boolean;
         readonly providePrefixAndSuffixTextForRename?: boolean;
     }
@@ -8527,6 +8527,8 @@ declare namespace ts.server.protocol {
          */
         readonly includeAutomaticOptionalChainCompletions?: boolean;
         readonly importModuleSpecifierPreference?: "auto" | "relative" | "non-relative";
+        /** Determines whether we import `foo/index.ts` as "foo", "foo/index", or "foo/index.js" */
+        readonly importModuleSpecifierEnding?: "auto" | "minimal" | "index" | "js";
         readonly allowTextChangesInNewFiles?: boolean;
         readonly lazyConfiguredProjectsFromExternalProject?: boolean;
         readonly providePrefixAndSuffixTextForRename?: boolean;
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index 8b600f90fdd41..f3bd48b312a81 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -3259,7 +3259,7 @@ declare namespace ts {
         readonly includeCompletionsWithInsertText?: boolean;
         readonly importModuleSpecifierPreference?: "auto" | "relative" | "non-relative";
         /** Determines whether we import `foo/index.ts` as "foo", "foo/index", or "foo/index.js" */
-        readonly importModuleSpecifierEnding?: "minimal" | "index" | "js";
+        readonly importModuleSpecifierEnding?: "auto" | "minimal" | "index" | "js";
         readonly allowTextChangesInNewFiles?: boolean;
         readonly providePrefixAndSuffixTextForRename?: boolean;
     }