Remove defaultProps (use default parameters)

This fixes React warnings: "Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead."

Author: koteus

packages/component/src/BasicScrollToBottom.js

@@ -22,13 +22,6 @@ const BasicScrollToBottomCore = ({ children, className, followButtonClassName, s
   );
 };
 
-BasicScrollToBottomCore.defaultProps = {
-  children: undefined,
-  className: undefined,
-  followButtonClassName: undefined,
-  scrollViewClassName: undefined
-};
-
 BasicScrollToBottomCore.propTypes = {
   children: PropTypes.any,
   className: PropTypes.string,
@@ -43,7 +36,7 @@ const BasicScrollToBottom = ({
   debounce,
   debug,
   followButtonClassName,
-  initialScrollBehavior,
+  initialScrollBehavior = 'smooth',
   mode,
   nonce,
   scroller,
@@ -68,20 +61,6 @@ const BasicScrollToBottom = ({
   </Composer>
 );
 
-BasicScrollToBottom.defaultProps = {
-  checkInterval: undefined,
-  children: undefined,
-  className: undefined,
-  debounce: undefined,
-  debug: undefined,
-  followButtonClassName: undefined,
-  initialScrollBehavior: 'smooth',
-  mode: undefined,
-  nonce: undefined,
-  scroller: undefined,
-  scrollViewClassName: undefined
-};
-
 BasicScrollToBottom.propTypes = {
   checkInterval: PropTypes.number,
   children: PropTypes.any,

packages/component/src/EventSpy.js

@@ -2,7 +2,7 @@ import { useCallback, useLayoutEffect, useMemo, useRef } from 'react';
 
 import debounceFn from './debounce';
 
-const EventSpy = ({ debounce, name, onEvent, target }) => {
+const EventSpy = ({ debounce = 200, name, onEvent, target }) => {
   // We need to save the "onEvent" to ref.
   // This is because "onEvent" may change from time to time, but debounce may still fire to the older callback.
   const onEventRef = useRef();
@@ -38,8 +38,4 @@ const EventSpy = ({ debounce, name, onEvent, target }) => {
   return false;
 };
 
-EventSpy.defaultProps = {
-  debounce: 200
-};
-
 export default EventSpy;

packages/component/src/ScrollToBottom/AutoHideFollowButton.js

@@ -27,7 +27,7 @@ const ROOT_STYLE = {
   }
 };
 
-const AutoHideFollowButton = ({ children, className }) => {
+const AutoHideFollowButton = ({ children, className = '' }) => {
   const [sticky] = useSticky();
   const rootCSS = useStyleToClassName()(ROOT_STYLE);
   const scrollToEnd = useScrollToEnd();
@@ -41,11 +41,6 @@ const AutoHideFollowButton = ({ children, className }) => {
   );
 };
 
-AutoHideFollowButton.defaultProps = {
-  children: undefined,
-  className: ''
-};
-
 AutoHideFollowButton.propTypes = {
   children: PropTypes.any,
   className: PropTypes.string

packages/component/src/ScrollToBottom/Composer.js

@@ -51,14 +51,14 @@ function isEnd(animateTo, mode) {
 }
 
 const Composer = ({
-  checkInterval,
+  checkInterval = 100,
   children,
-  debounce,
+  debounce = 17,
   debug: debugFromProp,
-  initialScrollBehavior,
+  initialScrollBehavior = 'smooth',
   mode,
   nonce,
-  scroller
+  scroller = DEFAULT_SCROLLER
 }) => {
   const debug = useMemo(() => createDebug(`<ScrollToBottom>`, { force: debugFromProp }), [debugFromProp]);
 
@@ -618,17 +618,6 @@ const Composer = ({
   );
 };
 
-Composer.defaultProps = {
-  checkInterval: 100,
-  children: undefined,
-  debounce: 17,
-  debug: undefined,
-  initialScrollBehavior: 'smooth',
-  mode: undefined,
-  nonce: undefined,
-  scroller: DEFAULT_SCROLLER
-};
-
 Composer.propTypes = {
   checkInterval: PropTypes.number,
   children: PropTypes.any,

packages/component/src/ScrollToBottom/Panel.js

@@ -22,11 +22,6 @@ const Panel = ({ children, className }) => {
   );
 };
 
-Panel.defaultProps = {
-  children: undefined,
-  className: undefined
-};
-
 Panel.propTypes = {
   children: PropTypes.any,
   className: PropTypes.string