Sass Alert: The mixin called roboto-family is missing from the stylesheet. Trace: Problem detected in src/pages/forms/forms.scss at

Greetings, I am diving into the world of Ionic for the first time. Recently, I embarked on a new project in Ionic and decided to integrate a theme. To do so, I copied an .html file, an .scss file, and also created a .ts file.

Forms.html

<!DOCTYPE html>
<html>
   <head lang="en">
     <meta charset="UTF-8">
     <title>Title</title>
     <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width">
     <link rel="stylesheet" type="text/css" href="http://code.ionicframework.com/ionicons/2.0.1/css/ionicons.min.css">
     <link rel="stylesheet" type="text/css" href="../bower_components/ionic/release/css/ionic.min.css">
     <link rel="stylesheet" type="text/css" href="../dist/css/ionic.material-design-lite.css">
     <script src="../bower_components/ionic/release/js/ionic.bundle.js"></script>
     <script src="../dist/js/ionic.material-design-lite.bundle.js"></script>
     <script src="js/app.js"></script>
  </head>
  <body class="use-material-icons" ng-app="material-starter">
       <div class="bar bar-header bar-assertive">
           <button class="button icon ion-navicon"></button>
           <h1 class="title">Form Elements</h1>
       </div>
       <ion-content class="has-header padding">
           <div class="list">
               <label class="item item-input">
                     <input type="text" placeholder="First Name" class="ng-invalid">
               </label>
               <label class="item item-input item-floating-label input-calm">
                    <span class="input-label">Last Name</span>
                    <input type="text" placeholder="Last Name">
              </label>
              <label class="item item-input input-energized">
                    <span class="input-label">Username</span>
                    <input type="text" ng-model="user">
              </label>
             <label class="item item-input item-stacked-label">
                    <span class="input-label">Email</span>
                    <input type="text">
             </label>
             <label class="item item-input">
                   <textarea placeholder="Comments"></textarea>
             </label>
         </div>

        <div class="list list-inset">
             <label class="item item-input">
                  <input type="text" placeholder="Username">
             </label>
             <label class="item item-input">
                  <input type="password" placeholder="Password">
             </label>
       </div>

       <div class="list">

           <div class="item item-input-inset">
               <label class="item-input-wrapper">
                    <input type="text" placeholder="Email">
               </label>
               <button class="button button-small">
                Submit
               </button>
           </div>
      </div>

      <div class="padding">
          <button class="button button-block button-positive">Submit</button>
       </div>
     </ion-content>
  </body>
</html>

Forms.scss

The styles within the Forms.scss file have been tailored to provide a unique design experience.

Forms.ts

Introducing the functionality written in TypeScript for the FormsPage component. It allows for interaction with the form elements.

Upon running the command 'ionic serve', an error was encountered:

Sass Error

A mixin named roboto-family is missing Backtrace: src/pages/forms/forms.scss:5

The fonts have been stored at the following path:

src/www/assets/fonts/roboto

If anyone could offer assistance in resolving this issue and point out any overlooked details, it would be greatly appreciated.

Answer №1

It seems that the code contains a repeated line:

@include roboto-family('Regular', 400);

However, no specific value or mixin for the roboto-family inclusion has been defined.

Let me illustrate this with an example.

A mixin enables you to create sets of CSS declarations that can be reused across your website. You can also input values to make your mixin more adaptable. An ideal use case for a mixin would be for vendor prefixes. Here is an instance for border-radius.

    @mixin border-radius($radius) {
      -webkit-border-radius: $radius;
         -moz-border-radius: $radius;
          -ms-border-radius: $radius;
              border-radius: $radius;
        }

.box { @include border-radius(10px); }

To form a mixin, employ the @mixin directive followed by a name. In this scenario, we have named our mixin as border-radius. Additionally, the variable $radius inside the parentheses allows us to insert any desired radius value. Subsequently, once the mixin is created, it can be utilized as a CSS declaration beginning with @include and stating the name of the mixin. When the CSS is generated, it will appear like this:

.box {
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  -ms-border-radius: 10px;
  border-radius: 10px;
}

In order to utilize @include roboto-family, you must define an @mixin roboto-family

I hope this explanation resolves your query.

ref: For more information and a detailed explanation

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