diff --git a/src/services/completions.ts b/src/services/completions.ts
index f0ad156956d82..89b15e9065a2f 100644
--- a/src/services/completions.ts
+++ b/src/services/completions.ts
@@ -652,7 +652,7 @@ namespace ts.Completions {
 
         const contextToken = findPrecedingToken(position, sourceFile);
         if (isInString(sourceFile, position, contextToken)) {
-            return StringCompletions.getStringLiteralCompletionDetails(name, sourceFile, position, contextToken, typeChecker, compilerOptions, host, cancellationToken);
+            return StringCompletions.getStringLiteralCompletionDetails(name, sourceFile, position, contextToken, typeChecker, compilerOptions, host, cancellationToken, preferences);
         }
 
         // Compute all the completion symbols again.
diff --git a/src/services/stringCompletions.ts b/src/services/stringCompletions.ts
index de823ad951d0e..12a3d724e7b82 100644
--- a/src/services/stringCompletions.ts
+++ b/src/services/stringCompletions.ts
@@ -7,7 +7,7 @@ namespace ts.Completions.StringCompletions {
         }
         if (isInString(sourceFile, position, contextToken)) {
             if (!contextToken || !isStringLiteralLike(contextToken)) return undefined;
-            const entries = getStringLiteralCompletionEntries(sourceFile, contextToken, position, checker, options, host);
+            const entries = getStringLiteralCompletionEntries(sourceFile, contextToken, position, checker, options, host, preferences);
             return convertStringLiteralCompletions(entries, contextToken, sourceFile, checker, log, preferences);
         }
     }
@@ -52,9 +52,9 @@ namespace ts.Completions.StringCompletions {
         }
     }
 
-    export function getStringLiteralCompletionDetails(name: string, sourceFile: SourceFile, position: number, contextToken: Node | undefined, checker: TypeChecker, options: CompilerOptions, host: LanguageServiceHost, cancellationToken: CancellationToken) {
+    export function getStringLiteralCompletionDetails(name: string, sourceFile: SourceFile, position: number, contextToken: Node | undefined, checker: TypeChecker, options: CompilerOptions, host: LanguageServiceHost, cancellationToken: CancellationToken, preferences: UserPreferences) {
         if (!contextToken || !isStringLiteralLike(contextToken)) return undefined;
-        const completions = getStringLiteralCompletionEntries(sourceFile, contextToken, position, checker, options, host);
+        const completions = getStringLiteralCompletionEntries(sourceFile, contextToken, position, checker, options, host, preferences);
         return completions && stringLiteralCompletionDetails(name, contextToken, completions, sourceFile, checker, cancellationToken);
     }
 
@@ -109,7 +109,7 @@ namespace ts.Completions.StringCompletions {
         readonly isNewIdentifier: boolean;
     }
     type StringLiteralCompletion = { readonly kind: StringLiteralCompletionKind.Paths, readonly paths: readonly PathCompletion[] } | StringLiteralCompletionsFromProperties | StringLiteralCompletionsFromTypes;
-    function getStringLiteralCompletionEntries(sourceFile: SourceFile, node: StringLiteralLike, position: number, typeChecker: TypeChecker, compilerOptions: CompilerOptions, host: LanguageServiceHost): StringLiteralCompletion | undefined {
+    function getStringLiteralCompletionEntries(sourceFile: SourceFile, node: StringLiteralLike, position: number, typeChecker: TypeChecker, compilerOptions: CompilerOptions, host: LanguageServiceHost, preferences: UserPreferences): StringLiteralCompletion | undefined {
         const parent = walkUpParentheses(node.parent);
         switch (parent.kind) {
             case SyntaxKind.LiteralType: {
@@ -136,7 +136,7 @@ namespace ts.Completions.StringCompletions {
                         }
                         return stringLiteralCompletionsFromProperties(typeChecker.getTypeFromTypeNode(objectType));
                     case SyntaxKind.ImportType:
-                        return { kind: StringLiteralCompletionKind.Paths, paths: getStringLiteralCompletionsFromModuleNames(sourceFile, node, compilerOptions, host, typeChecker) };
+                        return { kind: StringLiteralCompletionKind.Paths, paths: getStringLiteralCompletionsFromModuleNames(sourceFile, node, compilerOptions, host, typeChecker, preferences) };
                     case SyntaxKind.UnionType: {
                         if (!isTypeReferenceNode(grandParent.parent)) {
                             return undefined;
@@ -201,7 +201,7 @@ namespace ts.Completions.StringCompletions {
                 //      import x = require("/*completion position*/");
                 //      var y = require("/*completion position*/");
                 //      export * from "/*completion position*/";
-                return { kind: StringLiteralCompletionKind.Paths, paths: getStringLiteralCompletionsFromModuleNames(sourceFile, node, compilerOptions, host, typeChecker) };
+                return { kind: StringLiteralCompletionKind.Paths, paths: getStringLiteralCompletionsFromModuleNames(sourceFile, node, compilerOptions, host, typeChecker, preferences) };
 
             default:
                 return fromContextualType();
@@ -303,18 +303,18 @@ namespace ts.Completions.StringCompletions {
             Math.max(name.indexOf(directorySeparator), name.indexOf(altDirectorySeparator)) !== -1 ? { name, kind, extension, span: wholeSpan } : { name, kind, extension, span });
     }
 
-    function getStringLiteralCompletionsFromModuleNames(sourceFile: SourceFile, node: LiteralExpression, compilerOptions: CompilerOptions, host: LanguageServiceHost, typeChecker: TypeChecker): readonly PathCompletion[] {
-        return addReplacementSpans(node.text, node.getStart(sourceFile) + 1, getStringLiteralCompletionsFromModuleNamesWorker(sourceFile, node, compilerOptions, host, typeChecker));
+    function getStringLiteralCompletionsFromModuleNames(sourceFile: SourceFile, node: LiteralExpression, compilerOptions: CompilerOptions, host: LanguageServiceHost, typeChecker: TypeChecker, preferences: UserPreferences): readonly PathCompletion[] {
+        return addReplacementSpans(node.text, node.getStart(sourceFile) + 1, getStringLiteralCompletionsFromModuleNamesWorker(sourceFile, node, compilerOptions, host, typeChecker, preferences));
     }
 
-    function getStringLiteralCompletionsFromModuleNamesWorker(sourceFile: SourceFile, node: LiteralExpression, compilerOptions: CompilerOptions, host: LanguageServiceHost, typeChecker: TypeChecker): readonly NameAndKind[] {
+    function getStringLiteralCompletionsFromModuleNamesWorker(sourceFile: SourceFile, node: LiteralExpression, compilerOptions: CompilerOptions, host: LanguageServiceHost, typeChecker: TypeChecker, preferences: UserPreferences): readonly NameAndKind[] {
         const literalValue = normalizeSlashes(node.text);
 
         const scriptPath = sourceFile.path;
         const scriptDirectory = getDirectoryPath(scriptPath);
 
         return isPathRelativeToScript(literalValue) || !compilerOptions.baseUrl && (isRootedDiskPath(literalValue) || isUrl(literalValue))
-            ? getCompletionEntriesForRelativeModules(literalValue, scriptDirectory, compilerOptions, host, scriptPath)
+            ? getCompletionEntriesForRelativeModules(literalValue, scriptDirectory, compilerOptions, host, scriptPath, preferences)
             : getCompletionEntriesForNonRelativeModules(literalValue, scriptDirectory, compilerOptions, host, typeChecker);
     }
 
@@ -325,8 +325,8 @@ namespace ts.Completions.StringCompletions {
     function getExtensionOptions(compilerOptions: CompilerOptions, includeExtensions = false): ExtensionOptions {
         return { extensions: getSupportedExtensionsForModuleResolution(compilerOptions), includeExtensions };
     }
-    function getCompletionEntriesForRelativeModules(literalValue: string, scriptDirectory: string, compilerOptions: CompilerOptions, host: LanguageServiceHost, scriptPath: Path) {
-        const extensionOptions = getExtensionOptions(compilerOptions);
+    function getCompletionEntriesForRelativeModules(literalValue: string, scriptDirectory: string, compilerOptions: CompilerOptions, host: LanguageServiceHost, scriptPath: Path, preferences: UserPreferences) {
+        const extensionOptions = getExtensionOptions(compilerOptions, preferences.importModuleSpecifierEnding === "js");
         if (compilerOptions.rootDirs) {
             return getCompletionEntriesForDirectoryFragmentWithRootDirs(
                 compilerOptions.rootDirs, literalValue, scriptDirectory, extensionOptions, compilerOptions, host, scriptPath);
diff --git a/tests/cases/fourslash/completionImportModuleSpecifierEnding.ts b/tests/cases/fourslash/completionImportModuleSpecifierEnding.ts
new file mode 100644
index 0000000000000..7771a9ac781d3
--- /dev/null
+++ b/tests/cases/fourslash/completionImportModuleSpecifierEnding.ts
@@ -0,0 +1,12 @@
+/// <reference path='fourslash.ts'/>
+//@allowJs: true
+//@Filename:test.js
+////export function f(){
+////    return 1
+////}
+
+//@Filename:module.js
+////import { f } from ".//**/"
+
+
+verify.completions({ marker: "", includes:{name:"test.js"}, preferences: {importModuleSpecifierEnding: "js" }, isNewIdentifierLocation: true})
\ No newline at end of file