使用react-navigation-redux后出现isMounted废弃警告求助

Hey there, I’ve run into this exact warning with the dependency versions you’re using—let’s get rid of it for good!

Why This Warning Pops Up #

The issue stems from your version of react-navigation-redux-helpers (v1.0.5), which relies on React’s deprecated isMounted() method. React 16+ phased out this method because it can hide memory leaks and goes against modern component cleanup best practices, hence the warning.

Solution 1: Upgrade Dependencies (Recommended) #

The simplest fix is to update react-navigation-redux-helpers to a version that removes the isMounted() usage. For your react-navigation v1.5.11, the compatible updated version is ^2.0.0:

Run this command in your project root:

npm install react-navigation-redux-helpers@^2.0.0 --save
# Or if using yarn:
yarn add react-navigation-redux-helpers@^2.0.0

This version replaces the deprecated check with proper component cleanup patterns that align with React 16+ standards.

Solution 2: Patch the Existing Dependency (If You Can’t Upgrade) #

If upgrading dependencies isn’t feasible right now, use patch-package to modify the problematic code directly:

1. Install patch-package as a dev dependency:

   npm install patch-package --save-dev
   # Or yarn:
   yarn add patch-package --dev
   

2. Navigate to node_modules/react-navigation-redux-helpers/lib/createReactNavigationReduxMiddleware.js and locate lines using isMounted(), like:

   if (!this.isMounted()) {
     return;
   }
   

3. Replace the isMounted() check with a custom mounted flag:

   • Add a _isMounted property to the component class (in the constructor or componentDidMount):

     this._isMounted = true;
     

   • Update the check:

     if (!this._isMounted) {
       return;
     }
     

   • Add cleanup in componentWillUnmount:

     componentWillUnmount() {
       this._isMounted = false;
       // Keep any existing cleanup code here
     }
     

4. Generate the patch file to preserve your changes:

   npx patch-package react-navigation-redux-helpers
   

   This creates a patches/ folder in your project. From now on, every time you run npm install or yarn install, the patch will automatically apply.

Final Step #

Restart your React Native packager with cache reset to ensure changes take effect:

npm start -- --reset-cache

The warning should disappear once the deprecated isMounted() call is removed or replaced.

内容的提问来源于stack exchange，提问作者TMD