Don't return trigger characters for ambient JS suggestions

Fixes microsoft#130096

extensions/typescript-language-features/src/languageFeatures/completions.ts

@@ -89,7 +89,7 @@ class MyCompletionItem extends vscode.CompletionItem {
 		this.useCodeSnippet = completionContext.useCodeSnippetsOnMethodSuggest && (this.kind === vscode.CompletionItemKind.Function || this.kind === vscode.CompletionItemKind.Method);
 
 		this.range = this.getRangeFromReplacementSpan(tsEntry, completionContext);
-		this.commitCharacters = MyCompletionItem.getCommitCharacters(completionContext);
+		this.commitCharacters = MyCompletionItem.getCommitCharacters(completionContext, tsEntry);
 		this.insertText = isSnippet && tsEntry.insertText ? new vscode.SnippetString(tsEntry.insertText) : tsEntry.insertText;
 		this.filterText = this.getFilterText(completionContext.line, tsEntry.insertText);
 
@@ -489,7 +489,11 @@ class MyCompletionItem extends vscode.CompletionItem {
 		}
 	}
 
-	private static getCommitCharacters(context: CompletionContext): string[] | undefined {
+	private static getCommitCharacters(context: CompletionContext, entry: Proto.CompletionEntry): string[] | undefined {
+		if (entry.kind === PConst.Kind.warning) { // Ambient JS word based suggestion
+			return undefined;
+		}
+
 		if (context.isNewIdentifierLocation || !context.isInValidCommitCharacterContext) {
 			return undefined;
 		}