How to Clear
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Go to your Start => search window PowerShell and open run as administration
Open Your power shell and type the command
Type Y for Yes (or) A for Yes to All.
Then Go to Edit system environment variable “%AppData%\npm“
Click on Path => add the new environment path
Click on “Ok”. Restart the visual studio. Now run “ng serve”.
Then Go to your Visual Studio Code and try your angular command now.
For further queries below comments are welcome.
I hope this will be helpful for you. Have a good day.