From faaec1416d5d0e2f325912ded6b177a56554d423 Mon Sep 17 00:00:00 2001
From: Severin <sevefriede@gmail.com>
Date: Tue, 2 May 2017 01:04:51 +0200
Subject: [PATCH] Updating template function defintion (#15936)

* Updating template function defintion

As mentioned [here](https://github.com/seveves/ng2-vis/issues/32) there is a problem with the definition of the template functions. We really should allow any as a return value because you can return a string, Handlebars, mustache or even react templates. As you can see [here](http://visjs.org/docs/timeline/#Templates) the template function always has three parameters. I made them optional because you don't have to use them at all.

* Using fat arrow syntax

I think this is the right way to do it.

* Fix lint error
---
 types/vis/index.d.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/types/vis/index.d.ts b/types/vis/index.d.ts
index b265ce5693..5b7cc718b2 100644
--- a/types/vis/index.d.ts
+++ b/types/vis/index.d.ts
@@ -152,7 +152,7 @@ export interface TimelineOptions {
   groupEditable?: TimelineOptionsGroupEditableType;
   groupOrder?: TimelineOptionsGroupOrderType;
   groupOrderSwap?: TimelineOptionsGroupOrderSwapFunction;
-  groupTemplate?(): void; // TODO
+  groupTemplate?(item?: any, element?: any, data?: any): any;
   height?: HeightWidthType;
   hiddenDates?: any; // TODO
   horizontalScroll?: boolean;
@@ -187,7 +187,7 @@ export interface TimelineOptions {
   stack?: boolean;
   snap?: TimelineOptionsSnapFunction;
   start?: DateType;
-  template?(): void; // TODO
+  template?(item?: any, element?: any, data?: any): any;
   throttleRedraw?: number;
   timeAxis?: TimelineTimeAxisOption;
   type?: string;