You’re using a newer version of Prettier than the one in the book. They changed the argument from --loglevel to --log-level in Prettier v3, but the projects in the book use prettier@2.8.4.
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You’re using a newer version of Prettier than the one in the book. They changed the argument from --loglevel to --log-level in Prettier v3, but the projects in the book use prettier@2.8.4.