How to resolve the issue of “yarn is not recognized as an internal or external command”?

When you run a command in the command line and it prompts “yarn is not recognized as an internal or external command”, it means that the yarn command cannot be found on your system.

To solve this problem, you can try the following methods:

1. Make sure yarn is correctly installed: First, ensure that you have successfully installed yarn on your system. You can download and install it by visiting the official yarn website (https://yarnpkg.com/).
2. Check the installation path of yarn: If you have installed yarn but still cannot run commands, it may be because the installation path of yarn has not been properly added to the system’s environment variables. You can check the installation path of yarn and add it to the system’s environment variables so that you can run yarn commands from any location.
3. Sometimes, restarting the terminal or command prompt can also solve the issue. Try rebooting the terminal or command prompt and running the yarn command again.
4. Check the PATH environment variable of the system: If the above methods are not effective, you can check the system’s PATH environment variable to ensure that the installation path of yarn has been correctly added to it. You can run the “echo %PATH%” command in the terminal or command prompt to see if the installation path of yarn exists.

If none of the methods above can solve the problem, it may be due to other configuration or environmental issues. You can try seeking help in developer communities or related forums, or consult the official documentation of Yarn for more detailed solutions.