npm WARN config global –global, –local are deprecated. Use –location=global instead.

This seemed to solve the issue for me:

1. Go to folder C:\Program Files\nodejs
2. You have to edit four files named npm, npm.cmd, npx, npx.cmd
3. Open the files in a text editor, like Visual Studio Code
4. Replace prefix -g with prefix –location=global in all four files
5. Save all (if asked, save as administrator)

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