If your files aren’t properly formatted as a baseline, Prettifier will introduce many unrelated changes when it formats files. To prevent this, use the format script made in the previous step to format all files in your code base before activating Prettifier.
Commit to Prettier as the standard format for your code. Even if you don’t agree with all the decisions it makes, it avoids a wide range of unproductive bike-shed debates around indentation, position of parentheses and braces, etc. The benefits of using a code formatter like Prettier far outweight its disadvantages.