Tips for maximizing bootstrap efficiency by eliminating unnecessary CSS code during rendering

Question

Tips for maximizing bootstrap efficiency by eliminating unnecessary CSS code during rendering

Currently, we are developing an MVP using vue.js and have chosen to incorporate bootstrap for consistent styling of the elements on our single-page app.

As we begin to implement the skin/theme into our application, we have encountered an issue with unnecessary css being rendered on the page. Although we have successfully overridden these styles with higher specificity css selectors, we aim to optimize the code output by removing any unused "base" bootstrap css.

The Question:

How can we configure our environment to eliminate redundant css code from the bootstrap sass files?

Additional Details:

Bootstrap loads its own _buttons.scss file upon initialization.
We have added our custom "theme" _buttons.scss file after the bootstrap file, ensuring our styles take precedence.
We compile the sass code using node-sass compiler.
The resulting css includes both the original bootstrap styles as well as our themed styles for buttons.

In the screenshot provided, you can see that our button style is properly applied, but the default bootstrap style remains present in the output.

Our goal is to only display OUR STYLES in the browser.

Update:

The user interface we are creating includes classes directly from bootstrap along with our custom application-specific classes.

At times, it is necessary to override the default bootstrap styles using our custom styles, including colors and other css attributes defined in _variables.scss.

However, we are encountering duplicated css in the browser; displaying both our custom styles and the default bootstrap styles which are not required due to lower specificity.

We are looking for a solution to prevent compiling unnecessary sass code while also refraining from modifying the bootstrap code within ./node_modules/.

css sass bootstrap-4

Answer 1

Answer №1

Learn how to customize Bootstrap (version 4.x) defaults.

Study the source code

Begin by examining the bootstrap.scss file, which provides a detailed view of how the framework is structured component by component. You have the option to eliminate unnecessary components to streamline Bootstrap, but it's advisable to hold off on making changes at this point.

Next, explore the _variables.scss file. By reviewing this file, you'll discover that all customizable Bootstrap styles are defined here, including color schemes. This allows you to establish custom colors not just for buttons but for the entire framework. While you may be tempted to modify variables immediately, it's best to follow a specific approach.

Create a customization file

Avoid altering the original source code and instead create a new file named myproject.scss outside the Bootstrap source directory. Keeping modifications separate facilitates seamless future upgrades of Bootstrap.

Implement variable overrides

You can now begin transferring the variables you wish to adjust. Note that variables in _variables.scss feature the !default flag, allowing them to be overridden elsewhere. For instance, if you desire a different secondary color, locate the definition like $secondary, and add it with a new value in myproject.scss:

$secondary: #dd5679;

Include as many variable overrides as needed.

Integrate Bootstrap

Subsequently, import Bootstrap into the file. You can either incorporate the complete bootstrap.scss:

@import "relative/path/to/bootstrap/bootstrap";

Or manually copy the contents of bootstrap.scss, update the paths accordingly, and selectively comment out unwanted components:

@import "relative/path/to/bootstrap/functions";
@import "relative/path/to/bootstrap/variables";
@import "relative/path/to/bootstrap/mixins";
...
// @import "relative/path/to/bootstrap/popover";
// @import "relative/path/to/bootstrap/carousel";
@import "relative/path/to/bootstrap/utilities";
@import "relative/path/to/bootstrap/print";

The initial three imports ("functions", "variables", and "mixins") are essential core components and should not be excluded.

Incorporate project styles

Add your customized styles after this step. If there are numerous styles, consider organizing them into individual partial files like _mybuttons.scss (remember to begin names of partial files with an underscore), and then import them.

@import "mybuttons";

Your personalized Bootstrap source file is now prepared.

Compile to CSS

The resulting myproject.css file should replace the original Bootstrap CSS file when loading the page.

Answer 2

Learn how to customize Bootstrap (version 4.x) defaults.

Study the source code

Begin by examining the bootstrap.scss file, which provides a detailed view of how the framework is structured component by component. You have the option to eliminate unnecessary components to streamline Bootstrap, but it's advisable to hold off on making changes at this point.

Next, explore the _variables.scss file. By reviewing this file, you'll discover that all customizable Bootstrap styles are defined here, including color schemes. This allows you to establish custom colors not just for buttons but for the entire framework. While you may be tempted to modify variables immediately, it's best to follow a specific approach.

Create a customization file

Avoid altering the original source code and instead create a new file named myproject.scss outside the Bootstrap source directory. Keeping modifications separate facilitates seamless future upgrades of Bootstrap.

Implement variable overrides

You can now begin transferring the variables you wish to adjust. Note that variables in _variables.scss feature the !default flag, allowing them to be overridden elsewhere. For instance, if you desire a different secondary color, locate the definition like $secondary, and add it with a new value in myproject.scss:

$secondary: #dd5679;

Include as many variable overrides as needed.

Integrate Bootstrap

Subsequently, import Bootstrap into the file. You can either incorporate the complete bootstrap.scss:

@import "relative/path/to/bootstrap/bootstrap";

Or manually copy the contents of bootstrap.scss, update the paths accordingly, and selectively comment out unwanted components:

@import "relative/path/to/bootstrap/functions";
@import "relative/path/to/bootstrap/variables";
@import "relative/path/to/bootstrap/mixins";
...
// @import "relative/path/to/bootstrap/popover";
// @import "relative/path/to/bootstrap/carousel";
@import "relative/path/to/bootstrap/utilities";
@import "relative/path/to/bootstrap/print";

The initial three imports ("functions", "variables", and "mixins") are essential core components and should not be excluded.

Incorporate project styles

Add your customized styles after this step. If there are numerous styles, consider organizing them into individual partial files like _mybuttons.scss (remember to begin names of partial files with an underscore), and then import them.

@import "mybuttons";

Your personalized Bootstrap source file is now prepared.

Compile to CSS

The resulting myproject.css file should replace the original Bootstrap CSS file when loading the page.

Tips for maximizing bootstrap efficiency by eliminating unnecessary CSS code during rendering

The Question:

How can we configure our environment to eliminate redundant css code from the bootstrap sass files?

Answer №1

Study the source code

Create a customization file

Implement variable overrides

Integrate Bootstrap

Incorporate project styles

Compile to CSS

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