How to use the emmet/assets/resources.hasSyntax function in emmet

function runAction(action, df) {
		if (!isEnabled) {
			return df.reject().promise();
		}

		// do not handle Tab key for unknown syntaxes
		if (action == 'expand_abbreviation_with_tab') {
			var syntax = editor.getSyntax();
			var activeEditor = editor.editor;
			// do not allow tab expander in JS/JSX since it breakes native
			// snippets and indentation. Hardcode this exception for now
			if (syntax === 'jsx' || !preferences.getPreference('tab') || !resources.hasSyntax(syntax)) {
				return df.reject();
			}

			// do not expand abbreviation if there’s a selection
			if (activeEditor.hasSelection()) {
				if (activeEditor._handleTabKey) {
					activeEditor._handleTabKey();
				}
				return df.resolve();
			}
		}

		if (action == 'insert_formatted_line_break') {
			var activeEditor = editor.editor;
			var allowAction = !activeEditor.hasSelection() && ~lineBreakSyntaxes.indexOf(editor.getSyntax());
			if (!allowAction) {