There's not much to re-installing Prettier, and all we need is a npm command, plus the .prettierrc file we've been working with. For the former, just use the following command:

npm install --save-dev prettier

For configuration, we can use the contents of this .prettierrc file:

{
    "tabWidth": 4,
    "printWidth": 75
}

Now, we are set! We can check it's working; let's do that.