How to Use @import Statements in Sass Conditional Statements?

Using @import in @if Statements in Sass

While using Sass, you may encounter a situation where you want to selectively load CSS depending on the context. Consider a scenario where you have a login page that requires its own optimized CSS, while other pages use a cached file with all the necessary CSS.

In this case, you might have files like minifiedcssforloginpage.scss and grouped-pages.scss. To optimize CSS loading for the login page, you might define a variable $load-complete-css in minifiedcssforloginpage.scss and set it to false. Then, you could use @if statements within myproject.scss to import CSS modules conditionally.

<code class="scss">@if $load-complete-css {
    @import module1;
    @import module2;
    @import module3;
}</code>

However, you may run into an error stating that "Import directives may not be used within control directives or mixins." This is because Sass does not allow import directives within control structures.

Solution:

To overcome this limitation, you can convert your imports into mixins. Import files outside of the @if statement and then call the mixins where appropriate.

Modified Sass Structure:

• _partial.scss

<code class="scss">@mixin partial {
    .test { color: red }
    // other styles here
}</code>

• styles.scss

<code class="scss">@import "partial";
@if $someval == true {
    @include partial;
}</code>

By using mixins, you can dynamically include or exclude CSS modules based on the value of $load-complete-css. This approach allows for optimized CSS loading without encountering the error associated with using import directives within @if statements in Sass.

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