diff --git a/extensions/html/server/src/modes/javascriptMode.ts b/extensions/html/server/src/modes/javascriptMode.ts
index 52377fab1cc..04c2177a365 100644
--- a/extensions/html/server/src/modes/javascriptMode.ts
+++ b/extensions/html/server/src/modes/javascriptMode.ts
@@ -21,7 +21,7 @@ const JS_WORD_REGEX = /(-?\d*\.\d\w*)|([^\`\~\!\@\#\%\^\&\*\(\)\-\=\+\[\{\]\}\\\
 export function getJavascriptMode(documentRegions: LanguageModelCache<HTMLDocumentRegions>): LanguageMode {
 	let jsDocuments = getLanguageModelCache<TextDocument>(10, 60, document => documentRegions.get(document).getEmbeddedDocument('javascript'));
 
-	let compilerOptions: ts.CompilerOptions = { allowNonTsExtensions: true, allowJs: true, target: ts.ScriptTarget.Latest, moduleResolution: ts.ModuleResolutionKind.Classic };
+	let compilerOptions: ts.CompilerOptions = { allowNonTsExtensions: true, allowJs: true, lib: ['lib.es6.d.ts'], target: ts.ScriptTarget.Latest, moduleResolution: ts.ModuleResolutionKind.Classic };
 	let currentTextDocument: TextDocument;
 	let scriptFileVersion: number = 0;
 	function updateCurrentTextDocument(doc: TextDocument) {