SkeletonView - support content visible on start (#1664)

* SkeletonView - support content visible on start

* Fix some types

Author: M-i-k-e-l

generatedTypes/src/components/skeletonView/index.d.ts

@@ -1,14 +1,14 @@
 import React, { Component } from 'react';
 import { Animated, StyleProp, ViewStyle, AccessibilityProps } from 'react-native';
-declare enum Template {
+export declare enum Template {
     LIST_ITEM = "listItem",
     TEXT_CONTENT = "content"
 }
-declare enum Size {
+export declare enum Size {
     SMALL = "small",
     LARGE = "large"
 }
-declare enum ContentType {
+export declare enum ContentType {
     AVATAR = "avatar",
     THUMBNAIL = "thumbnail"
 }

src/components/skeletonView/index.tsx

@@ -14,17 +14,17 @@ let ShimmerPlaceholder: any;
 
 const ANIMATION_DURATION = 400;
 
-enum Template {
+export enum Template {
   LIST_ITEM = 'listItem',
   TEXT_CONTENT = 'content'
 }
 
-enum Size {
+export enum Size {
   SMALL = 'small',
   LARGE = 'large'
 }
 
-enum ContentType {
+export enum ContentType {
   AVATAR = 'avatar',
   THUMBNAIL = 'thumbnail'
 }
@@ -165,17 +165,17 @@ class SkeletonView extends Component<SkeletonViewProps, SkeletonState> {
     borderRadius: BorderRadiuses.br10
   };
 
-  static templates = Template;
-  static sizes = Size;
-  static contentTypes = ContentType;
+  static templates: typeof Template = Template;
+  static sizes: typeof Size = Size;
+  static contentTypes: typeof ContentType = ContentType;
 
   fadeInAnimation?: Animated.CompositeAnimation;
 
   constructor(props: SkeletonViewProps) {
     super(props);
 
     this.state = {
-      isAnimating: !_.isUndefined(props.showContent),
+      isAnimating: props.showContent === false,
       opacity: new Animated.Value(0)
     };