@fortawesome/angular-fontawesome not visible code example

Example: font awesome angular

//install in your project directory
npm install --save @fortawesome/fontawesome-free

// in angular.json add in the 'build' section the following lines in 'styles' and 'scripts'
"styles": [
           "node_modules/@fortawesome/fontawesome-free/css/all.css"
        ]

"scripts": [
          "node_modules/@fortawesome/fontawesome-free/js/all.js"
        ]

//from now on, you can use fontawesome icons through the <i>
    <i class='fab fa-facebook'></i>