Convert NodeAnimator to TS

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

src/NodeAnimator.tsx

@@ -1,6 +1,21 @@
 import React from "react";
 import ReactDom from "react-dom";
-import PropTypes from 'prop-types';
+
+interface IChildProps {
+    style: React.CSSProperties;
+    ref: (node: React.ReactInstance) => void;
+}
+
+interface IProps {
+    // either a list of child nodes, or a single child.
+    children: React.ReactNode;
+
+    // optional transition information for changing existing children
+    transition?: object;
+
+    // a list of state objects to apply to each child node in turn
+    startStyles: React.CSSProperties[];
+}
 
 /**
  * The NodeAnimator contains components and animates transitions.
@@ -9,55 +24,45 @@ import PropTypes from 'prop-types';
  * from DOM order. This makes it a lot simpler and lighter: if you need fully
  * automatic positional animation, look at react-shuffle or similar libraries.
  */
-export default class NodeAnimator extends React.Component {
-    static propTypes = {
-        // either a list of child nodes, or a single child.
-        children: PropTypes.any,
-
-        // optional transition information for changing existing children
-        transition: PropTypes.object,
-
-        // a list of state objects to apply to each child node in turn
-        startStyles: PropTypes.array,
-    };
-
-    static defaultProps = {
+export default class NodeAnimator extends React.Component<IProps> {
+    private nodes = {};
+    private children: { [key: string]: React.DetailedReactHTMLElement<any, HTMLElement> };
+    static defaultProps: Partial<IProps> = {
         startStyles: [],
     };
 
-    constructor(props) {
+    constructor(props: IProps) {
         super(props);
 
-        this.nodes = {};
-        this._updateChildren(this.props.children);
+        this.updateChildren(this.props.children);
     }
 
-    componentDidUpdate() {
-        this._updateChildren(this.props.children);
+    public componentDidUpdate(): void {
+        this.updateChildren(this.props.children);
     }
 
     /**
      *
      * @param {HTMLElement} node element to apply styles to
-     * @param {object} styles a key/value pair of CSS properties
+     * @param {React.CSSProperties} styles a key/value pair of CSS properties
      * @returns {void}
      */
-    _applyStyles(node, styles) {
+    private applyStyles(node: HTMLElement, styles: React.CSSProperties): void {
         Object.entries(styles).forEach(([property, value]) => {
             node.style[property] = value;
         });
     }
 
-    _updateChildren(newChildren) {
+    private updateChildren(newChildren: React.ReactNode): void {
         const oldChildren = this.children || {};
         this.children = {};
-        React.Children.toArray(newChildren).forEach((c) => {
+        React.Children.toArray(newChildren).forEach((c: any) => {
             if (oldChildren[c.key]) {
                 const old = oldChildren[c.key];
                 const oldNode = ReactDom.findDOMNode(this.nodes[old.key]);
 
-                if (oldNode && oldNode.style.left !== c.props.style.left) {
-                    this._applyStyles(oldNode, { left: c.props.style.left });
+                if (oldNode && (oldNode as HTMLElement).style.left !== c.props.style.left) {
+                    this.applyStyles(oldNode as HTMLElement, { left: c.props.style.left });
                     // console.log("translation: "+oldNode.style.left+" -> "+c.props.style.left);
                 }
                 // clone the old element with the props (and children) of the new element
@@ -66,7 +71,7 @@ export default class NodeAnimator extends React.Component {
             } else {
                 // new element. If we have a startStyle, use that as the style and go through
                 // the enter animations
-                const newProps = {};
+                const newProps: Partial<IChildProps> = {};
                 const restingStyle = c.props.style;
 
                 const startStyles = this.props.startStyles;
@@ -76,7 +81,7 @@ export default class NodeAnimator extends React.Component {
                     // console.log("mounted@startstyle0: "+JSON.stringify(startStyle));
                 }
 
-                newProps.ref = ((n) => this._collectNode(
+                newProps.ref = ((n) => this.collectNode(
                     c.key, n, restingStyle,
                 ));
 
@@ -85,7 +90,7 @@ export default class NodeAnimator extends React.Component {
         });
     }
 
-    _collectNode(k, node, restingStyle) {
+    private collectNode(k: string, node: React.ReactInstance, restingStyle: React.CSSProperties): void {
         if (
             node &&
             this.nodes[k] === undefined &&
@@ -96,7 +101,7 @@ export default class NodeAnimator extends React.Component {
             // start from startStyle 1: 0 is the one we gave it
             // to start with, so now we animate 1 etc.
             for (let i = 1; i < startStyles.length; ++i) {
-                this._applyStyles(domNode, startStyles[i]);
+                this.applyStyles(domNode as HTMLElement, startStyles[i]);
                 // console.log("start:"
                 //             JSON.stringify(startStyles[i]),
                 //             );
@@ -104,7 +109,7 @@ export default class NodeAnimator extends React.Component {
 
             // and then we animate to the resting state
             setTimeout(() => {
-                this._applyStyles(domNode, restingStyle);
+                this.applyStyles(domNode as HTMLElement, restingStyle);
             }, 0);
 
             // console.log("enter:",
@@ -113,7 +118,7 @@ export default class NodeAnimator extends React.Component {
         this.nodes[k] = node;
     }
 
-    render() {
+    public render(): JSX.Element {
         return (
             <>{ Object.values(this.children) }</>
         );