Explain how to uninstall create-react-app globally (facebook#9244)

* Explain how to uninstall create-react-app globally

* Add uninstallation intructions for yarn

README.md

@@ -17,7 +17,7 @@ cd my-app
 npm start
 ```
 
-If you've previously installed `create-react-app` globally via `npm install -g create-react-app`, we recommend you uninstall the package using `npm uninstall -g create-react-app` to ensure that npx always uses the latest version.
+If you've previously installed `create-react-app` globally via `npm install -g create-react-app`, we recommend you uninstall the package using `npm uninstall -g create-react-app` or `yarn global remove create-react-app` to ensure that npx always uses the latest version.
 
 _([npx](https://medium.com/@maybekatz/introducing-npx-an-npm-package-runner-55f7d4bd282b) comes with npm 5.2+ and higher, see [instructions for older npm versions](https://gist.github.com/gaearon/4064d3c23a77c74a3614c498a8bb1c5f))_
 

docusaurus/docs/adding-typescript.md

@@ -19,7 +19,7 @@ npx create-react-app my-app --template typescript
 yarn create react-app my-app --template typescript
 ```
 
-> If you've previously installed `create-react-app` globally via `npm install -g create-react-app`, we recommend you uninstall the package using `npm uninstall -g create-react-app` to ensure that `npx` always uses the latest version.
+> If you've previously installed `create-react-app` globally via `npm install -g create-react-app`, we recommend you uninstall the package using `npm uninstall -g create-react-app` or `yarn global remove create-react-app` to ensure that `npx` always uses the latest version.
 >
 > Global installs of `create-react-app` are no longer supported.
 
@@ -47,7 +47,7 @@ You are not required to make a [`tsconfig.json` file](https://www.typescriptlang
 
 ## Troubleshooting
 
-If your project is not created with TypeScript enabled, npx may be using a cached version of `create-react-app`. Remove previously installed versions with `npm uninstall -g create-react-app` (see [#6119](https://github.com/facebook/create-react-app/issues/6119#issuecomment-451614035)).
+If your project is not created with TypeScript enabled, npx may be using a cached version of `create-react-app`. Remove previously installed versions with `npm uninstall -g create-react-app` or `yarn global remove create-react-app` (see [#6119](https://github.com/facebook/create-react-app/issues/6119#issuecomment-451614035)).
 
 If you are currently using [create-react-app-typescript](https://github.com/wmonk/create-react-app-typescript/), see [this blog post](https://vincenttunru.com/migrate-create-react-app-typescript-to-create-react-app/) for instructions on how to migrate to Create React App.
 

docusaurus/docs/getting-started.md

@@ -14,7 +14,7 @@ cd my-app
 npm start
 ```
 
-> If you've previously installed `create-react-app` globally via `npm install -g create-react-app`, we recommend you uninstall the package using `npm uninstall -g create-react-app` to ensure that `npx` always uses the latest version.
+> If you've previously installed `create-react-app` globally via `npm install -g create-react-app`, we recommend you uninstall the package using `npm uninstall -g create-react-app` or `yarn global remove create-react-app` to ensure that `npx` always uses the latest version.
 
 _([npx](https://medium.com/@maybekatz/introducing-npx-an-npm-package-runner-55f7d4bd282b) comes with npm 5.2+ and higher, see [instructions for older npm versions](https://gist.github.com/gaearon/4064d3c23a77c74a3614c498a8bb1c5f))_
 

packages/react-scripts/scripts/init.js

@@ -103,6 +103,13 @@ module.exports = function (
         'create-react-app'
       )} are no longer supported.`
     );
+    console.error(
+      `You can fix this by running ${chalk.cyan(
+        'npm uninstall -g create-react-app'
+      )} or ${chalk.cyan(
+        'yarn global remove create-react-app'
+      )} before using ${chalk.cyan('create-react-app')} again.`
+    );
     return;
   }