@use directive for imports in SASS - Mini Project: Build & Apply

@use directive for imports in Sass

📖 Scenario: You are building a simple website style using Sass. You want to organize your styles by splitting colors and typography into separate files. Then you will import these files into a main stylesheet using the modern @use directive.

🎯 Goal: Create two Sass partial files named _colors.scss and _typography.scss with variables. Then use the @use directive in styles.scss to import them and apply the styles to the body.

📋 What You'll Learn

Create a partial file _colors.scss with a variable $primary-color set to #3498db.

Create a partial file _typography.scss with a variable $font-stack set to 'Helvetica, Arial, sans-serif'.

In styles.scss, use the @use directive to import both partials.

Apply the imported variables to style the body background color and font family.

💡 Why This Matters

🌍 Real World

Organizing CSS styles in large projects by splitting variables and styles into separate files improves maintainability and collaboration.

💼 Career

Modern front-end developers use Sass with <code>@use</code> to write scalable and clean stylesheets for websites and applications.

1

Create _colors.scss with a color variable

Create a Sass partial file named _colors.scss and define a variable called $primary-color with the value #3498db.

SASS

// Define $primary-color variable here
// Your code here

Hint

Start with $primary-color: then add the color #3498db and end with a semicolon.

2

Create _typography.scss with a font variable

Create a Sass partial file named _typography.scss and define a variable called $font-stack with the value 'Helvetica, Arial, sans-serif'.

SASS

// Define $font-stack variable here
// Your code here

Hint

Use $font-stack: then the font family string in quotes and a semicolon.

3

Import partials in styles.scss using @use

In styles.scss, write two @use directives to import _colors.scss and _typography.scss partials.

SASS

// Use @use to import _colors.scss
// Use @use to import _typography.scss
// Your code here

Hint

Use @use 'colors'; and @use 'typography'; to import the partials without the underscore or extension.

4

Apply imported variables to style the body

In styles.scss, add a body selector that sets background-color to colors.$primary-color and font-family to typography.$font-stack.

SASS

@use 'colors';
@use 'typography';

// Add body selector with background-color and font-family using imported variables
// Your code here

Hint

Use the namespace from @use followed by the variable name with a dot, like colors.$primary-color.

Practice

1. What is the main purpose of the @use directive in Sass?

easy

A. To import Sass files with a namespace to avoid conflicts

B. To directly copy CSS styles without any namespace

C. To run JavaScript code inside Sass files

D. To export variables from Sass files

Solution

1. Step 1: Understand the role of @use

   The @use directive imports Sass files and applies a namespace to their contents.

2. Step 2: Compare with other import methods

   Unlike @import, @use avoids naming conflicts by requiring namespace prefixes.

3. Final Answer:

   To import Sass files with a namespace to avoid conflicts -> Option A

4. Quick Check:

   @use adds namespace = C [OK]

Hint: Remember: @use always adds a namespace [OK]

Common Mistakes:

• Thinking @use copies styles without namespace
• Confusing @use with JavaScript execution
• Believing @use exports variables

2. Which of the following is the correct syntax to import a Sass file named colors.scss using @use?

easy

A. @use 'colors';

B. @use colors.scss;

C. @use "colors.scss";

D. @use colors;

Solution

1. Step 1: Check correct quoting and file extension

   The @use directive requires the file path as a string without the extension, usually quoted.

2. Step 2: Validate options

   @use 'colors'; uses quotes and omits the extension, which is correct. Options B and C include the extension incorrectly or wrong quotes. @use colors; lacks quotes.

3. Final Answer:

   @use 'colors'; -> Option A

4. Quick Check:

   Quotes + no extension = D [OK]

Hint: Use quotes and omit .scss extension in @use [OK]

Common Mistakes:

• Including the .scss extension inside @use
• Not using quotes around the file name
• Using double quotes inconsistently

3. Given the following Sass files, what will be the color of the h1 text?

@use 'colors';
h1 {
  color: colors.$primary;
}

// colors.scss
$primary: blue;
$secondary: green;

medium

A. green

B. black

C. red

D. blue

Solution

1. Step 1: Identify the imported variables

   The @use 'colors'; imports variables with the namespace colors. The variable $primary is set to blue.

2. Step 2: Check the usage in h1

   The color is set to colors.$primary, which refers to blue.

3. Final Answer:

   blue -> Option D

4. Quick Check:

   Namespace + variable = blue [OK]

Hint: Namespace.variable accesses imported values [OK]

Common Mistakes:

• Forgetting to use the namespace prefix
• Confusing $primary with $secondary
• Assuming default color without import

4. What is wrong with this Sass code?

@use 'theme';
h1 {
  color: $main-color;
}

// theme.scss
$main-color: red;

medium

A. The file path must include the .scss extension

B. Using as * is invalid syntax in @use

C. Variables must be accessed with namespace prefix unless configured

D. Variables cannot be used inside selectors

Solution

1. Step 1: Understand @use namespace behavior

   By default, variables must be accessed with the namespace prefix unless as * is used to remove it.

2. Step 2: Check the code usage

   The code uses @use 'theme'; without as *, so variables must be accessed with the theme. prefix, but $main-color is used without it, causing an undefined variable error.

3. Step 3: Identify the actual problem

   Without as *, the prefix is required, so Variables must be accessed with namespace prefix unless configured identifies the issue.

4. Final Answer:

   Variables must be accessed with namespace prefix unless configured -> Option C

5. Quick Check:

   Default namespace prefix required = A [OK]

Hint: Use namespace or as * to access variables directly [OK]

Common Mistakes:

• Thinking as * is invalid syntax
• Forgetting to prefix variables without as *
• Including .scss extension in @use

5. You want to import variables.scss but rename its namespace to vars and override the variable $font-size to 1.5rem. Which @use syntax is correct?

hard

A. @use 'variables' as vars ($font-size: 1.5rem);

B. @use 'variables' as vars with ($font-size: 1.5rem);

C. @use 'variables' with ($font-size: 1.5rem) as vars;

D. @use 'variables' rename vars with ($font-size: 1.5rem);

Solution

1. Step 1: Recall @use syntax for renaming and configuring

   The correct syntax is @use 'file' as namespace with (variable overrides);.

2. Step 2: Match options to syntax

   @use 'variables' as vars with ($font-size: 1.5rem); matches the correct order and syntax. Options B, C, and D have incorrect order or keywords.

3. Final Answer:

   @use 'variables' as vars with ($font-size: 1.5rem); -> Option B

4. Quick Check:

   Namespace + with (overrides) = A [OK]

Hint: Use as then with for renaming and overrides [OK]

Common Mistakes:

• Swapping as and with order
• Using invalid keywords like rename
• Omitting parentheses around overrides