Can you Conditionally Import CSS Files in Sass using @if Statements?

Using @import in Conditional Statements in Sass

Sass, a popular CSS preprocessor, offers conditional statements using @if directives. However, using @import within such statements is not permitted.

The Issue:

One common scenario is wanting to load specific CSS files based on the current page or context for performance optimization. For instance, a login page may require a smaller CSS file than other pages that include additional modules.

To achieve this, developers may attempt to use @if statements to conditionally import the necessary CSS files. However, this approach results in the error: "Import directives may not be used within control directives or mixins."

Solution:

The solution is to convert the CSS imports into mixins. Here's how it's done:

1. Create a Partial File: Create a partial file (e.g., _partial.scss) that contains the CSS imports:

<code class="scss">@import "module1";
@import "module2";
@import "module3";</code>

2. Use Mixins in Conditional Statements: In the main Sass file (e.g., styles.scss), create a mixin that includes the desired partial file:

<code class="scss">@mixin loadStyles {
    @include partial;
}</code>

3. Use the Mixin Conditionally: Finally, in the @if statement, include the mixin:

<code class="scss">@if $load-complete-css {
    @include loadStyles;
}</code>

By wrapping the imports in a mixin, you can effectively use @if statements to conditionally load CSS files. Sass will compile the mixin only when the condition is met, ensuring that the correct CSS is generated for each page.

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