Merge pull request github#4593 from asgerf/js/react-hot

Approved by erik-krogh

Author: codeql-ci

javascript/change-notes/2020-11-11-react-hot-loader.md

@@ -0,0 +1,2 @@
+lgtm,codescanning
+* Hot-reloading React component are now recognized. Affects the package `react-hot-loader`.

javascript/ql/src/semmle/javascript/frameworks/React.qll

@@ -742,6 +742,8 @@ private DataFlow::SourceNode higherOrderComponentBuilder() {
   or
   result = DataFlow::moduleMember("react-redux", "connect").getACall()
   or
+  result = DataFlow::moduleMember(["react-hot-loader", "react-hot-loader/root"], "hot").getACall()
+  or
   result = reactRouterDom().getAPropertyRead("withRouter")
   or
   exists(FunctionCompositionCall compose |

javascript/ql/test/library-tests/frameworks/ReactJS/higherOrderComponent.jsx

@@ -3,6 +3,7 @@ import { connect } from 'react-redux';
 import { compose } from 'redux';
 import styled from 'styled-components';
 import unknownFunction from 'somewhere';
+import { hot } from 'react-hot-loader';
 
 import { MyComponent } from './exportedComponent';
 
@@ -21,4 +22,4 @@ const withConnect = connect(mapStateToProps, mapDispatchToProps);
 
 const ConnectedComponent = compose(withConnect, unknownFunction)(StyledComponent);
 
-export default memo(ConnectedComponent);
+export default hot(module)(memo(ConnectedComponent));