Revert "Upgrade React to 16.8.2: Welcome React Hooks (#13992)" (#14017)

This reverts commit 6f88bec.

lib/client-assets.php

@@ -540,12 +540,12 @@ function gutenberg_register_vendor_scripts() {
 
  gutenberg_register_vendor_script(
  'react',
- 'https://unpkg.com/react@16.8.2/umd/react' . $react_suffix . '.js',
+ 'https://unpkg.com/react@16.6.3/umd/react' . $react_suffix . '.js',
  array( 'wp-polyfill' )
  );
  gutenberg_register_vendor_script(
  'react-dom',
- 'https://unpkg.com/react-dom@16.8.2/umd/react-dom' . $react_suffix . '.js',
+ 'https://unpkg.com/react-dom@16.6.3/umd/react-dom' . $react_suffix . '.js',
  array( 'react' )
  );
  $moment_script = SCRIPT_DEBUG ? 'moment.js' : 'min/moment.min.js';

package.json

@@ -104,8 +104,8 @@
  "pegjs": "0.10.0",
  "phpegjs": "1.0.0-beta7",
  "postcss": "7.0.13",
- "react-dom": "16.8.2",
- "react-test-renderer": "16.8.2",
+ "react-dom": "16.6.3",
+ "react-test-renderer": "16.6.3",
  "redux": "4.0.0",
  "rimraf": "2.6.2",
  "rtlcss": "2.4.0",

packages/element/package.json

@@ -24,8 +24,8 @@
  "@babel/runtime": "^7.3.1",
  "@wordpress/escape-html": "file:../escape-html",
  "lodash": "^4.17.11",
- "react": "^16.8.2",
- "react-dom": "^16.8.2"
+ "react": "^16.6.3",
+ "react-dom": "^16.6.3"
  },
  "publishConfig": {
  "access": "public"

packages/element/src/react.js

@@ -12,16 +12,6 @@ import {
  Fragment,
  isValidElement,
  StrictMode,
- useState,
- useEffect,
- useContext,
- useReducer,
- useCallback,
- useMemo,
- useRef,
- useImperativeHandle,
- useLayoutEffect,
- useDebugValue,
 } from 'react';
 import { isString } from 'lodash';
 
@@ -103,22 +93,6 @@ export { isValidElement };
 
 export { StrictMode };
 
-/**
- * Make React Hooks available
- */
-export {
- useCallback,
- useContext,
- useDebugValue,
- useEffect,
- useImperativeHandle,
- useLayoutEffect,
- useMemo,
- useReducer,
- useRef,
- useState,
-};
-
 /**
  * Concatenate two or more React children objects.
  *