Added test.

src/compiler/types.ts

@@ -6441,6 +6441,7 @@ namespace ts {
         readonly disableSuggestions?: boolean;
         readonly quotePreference?: "auto" | "double" | "single";
         readonly includeCompletionsForModuleExports?: boolean;
+        readonly includeAutomaticOptionalChainCompletions?: boolean;
         readonly includeCompletionsWithInsertText?: boolean;
         readonly importModuleSpecifierPreference?: "relative" | "non-relative";
         /** Determines whether we import `foo/index.ts` as "foo", "foo/index", or "foo/index.js" */

tests/cases/fourslash/completionNoAutoInsertQuestionDotWithUserPreferencesOff.ts

@@ -0,0 +1,20 @@
+/// <reference path="fourslash.ts" />
+// @strict: true
+
+//// interface User {
+////     address?: {
+////         city: string;
+////         "postal code": string;
+////     }
+//// };
+//// declare const user: User;
+//// user.address[|./**/|]
+
+verify.completions({
+    marker: "",
+    exact: [],
+    preferences: {
+        includeInsertTextCompletions: true,
+        includeAutomaticOptionalChainCompletions: false
+    },
+});

tests/cases/fourslash/fourslash.ts

@@ -583,6 +583,7 @@ declare namespace FourSlashInterface {
         readonly quotePreference?: "double" | "single";
         readonly includeCompletionsForModuleExports?: boolean;
         readonly includeInsertTextCompletions?: boolean;
+        readonly includeAutomaticOptionalChainCompletions?: boolean;
         readonly importModuleSpecifierPreference?: "relative" | "non-relative";
         readonly importModuleSpecifierEnding?: "minimal" | "index" | "js";
     }