Fixed some flow errors. Many remain, but they don't seem very fixable... Many...

Fixed some flow errors. Many remain, but they don't seem very fixable... Many are related to either my use of polymorphism in the write/edit article, or use of either null/Object for both Article's and strings.

client/src/ArticleWidgets.js

@@ -15,7 +15,7 @@ const Article = require('../src/Article');
 export class ArticleGrid extends Component<{ category?: number }> {
 
     mounted() {
-        articleStore.getAllArticles().catch(error => console.log(error));
+        articleStore.getAllArticles();
     }
 
     render() {
@@ -44,14 +44,11 @@ export class ArticleGrid extends Component<{ category?: number }> {
 }
 
 export class SingleArticle extends Component<{ match: { params: { id: number } } }> {
-    constructor(props) {
+    constructor(props: any) {
         super(props);
         if (this.props.match != null && this.props.match.params.id) {
             console.log("Fetching " + this.props.match.params.id);
-            articleStore.getArticle(this.props.match.params.id).catch(error => console.log(error));
-        } else if (this.props.id != null && this.props.id) {
-            console.log("Fetching " + this.props.id);
-            articleStore.getArticle(this.props.id).catch(error => console.log(error));
+            articleStore.getArticle(this.props.match.params.id);
         }
     }
 
@@ -89,17 +86,23 @@ export class SingleArticle extends Component<{ match: { params: { id: number } }
 class AddOrEditArticle extends Component {
     author: string;
     title: string;
-    imageURL: string;
+    imageURL: string | null;
     content: string;
     category: number;
     important: boolean;
     time: string;
+    authorRef: any;
+    titleRef: any;
+    imageRef: any;
+    contentRef: any;
+    categoryRef: any;
+    importantRef: any;
 
     validateURL(URL: string) {
         return (URL.match(/\.(jpeg|jpg|gif|png)$/) != null);
     }
 
-    constructor(props) {
+    constructor(props: any) {
         super(props);
         this.authorRef = React.createRef();
         this.titleRef = React.createRef();

client/src/stores.js

@@ -17,6 +17,17 @@ class ArticleStore {
   currentArticle: Article = null;
   categories: any = {};
 
+  assignArticle(article: Article){
+    this.currentArticle.id = article.id;
+    this.currentArticle.title = article.title;
+    this.currentArticle.content = article.content;
+    this.currentArticle.imageURL = article.imageURL;
+    this.currentArticle.time = article.time;
+    this.currentArticle.comments = article.comments;
+    this.currentArticle.category = article.category;
+    this.currentArticle.important = article.important;
+  }
+
   getIds(){
     return axios.get("http://localhost:4000/ids").then(response =>  {
       if (response.status === 500){
@@ -48,10 +59,10 @@ class ArticleStore {
     });
   }
 
-  createArticle(response): Article{
+  createArticle(response: any): Article{
     return new Article(response.id,
         response.author, response.title, response.imageURL, response.time, response.content, response.category,
-        response.important === 1, []);
+        response.important === 1);
   }
 
   getArticle(id: number): Article{
@@ -65,7 +76,7 @@ class ArticleStore {
         this.currentArticle = this.createArticle(response.data[0]);
         let article: Article = this.articles.find(a => this.currentArticle.id === a.id);
         if (article){
-          Object.assign(article, {...this.currentArticle});
+          this.assignArticle(article);
         }
       }
       else{
@@ -184,7 +195,7 @@ class ArticleStore {
 
     let articleFromList: Article = this.articles.find(a => this.currentArticle.id === a.id);
     if (articleFromList){
-      Object.assign(articleFromList, {...this.currentArticle});
+      this.assignArticle(articleFromList);
     }
 
     let data: {author: string, title: string, imageURL: string, time: string, content: string, category: number, important: boolean} = {