Angular: #extend vs. global style in styles.scss [closed] - css

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I've an angular app which uses SASS.I want to style a certain class of buttons in specific way. This class of button is used throughout my app in certain components. I want to know which would be better way to write the common style for them. I know using #import and #extend will copy my common styles into each component's scss right after compilation? So will it affect the size of my application as well it's performance?
Another idea I have is to go for global stylesheet, styles.scss.
I want to know which would be better in terms of maintenance and performance.

indeed, #import and #include will copy the code into your component style, so your bundle size will grow.
Using #extend only copy the CSS selector of your class (instead of its content), so your bundle will also grow, but less than using #include. A downside of #extend is you can't use a #media queries with an #extend.
The lightest solution is using styles.scss, which can obviously be splitted into multiple files, which would be imported into your styles.scss. That is how I personnaly use a Design System in all my angular apps.
I only import variables and mixins in my components. All global stuff is handled in styles.scss

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best (optimal) way to use style in react js [closed]

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There are so many ways to use style inside react js that it confuses me.
for example :
Normal CSS
CSS in JS
Styled Components
Sass & SCSS
Are the above methods influencing website load speed?
What is the difference between these methods?
Try using SCSS when ever you can. It helps to organize your stylings and will be processed to css any way. So there is literally no mentionable downside.
For simple styling i would recommend normal css classes (in .scss files).
For complex animation or styling logic use javascript in conjuction with existing animation libraries like framer-motion. That way you have more control over what is happening and also more possibilities to make your site outstanding and unique.
Performance is all the same, all of them are translated into plain CSS when you run : npm run build.
CSS has its benefits, because of designer-friendly but you may get some problems by accidentally making 2 classes with the same name(this is when you have CSS split into many files) if this happens it will make debugging a nightmare (been there myself).
Sass has the same problem as css, but it's a way more cooler css :)
Styled-component, CSS in js, may fit a little better on react component-based world, because for every "class" that you style a UNIQE className is generated + it gives you more power by having props/state modifying the styles of classes, not like others where for a backgroundColor change you will need 2 classes.
There are a lot of ways to do this, best-comparing article that it served me well in my beginning is in here: https://www.sitepoint.com/react-components-styling-options/

How browsers will convert mixins to regular css [closed]

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In Less and Sass we make use of lots of mixins, how does the browser compile or converts those mixins to regular CSS and apply those styles?
The browser DOES NOT convert pre-processed (LESS, SCSS, Compass) CSS rules.
You need to use a build script/compiler BEFORE linking a normal CSS file to your HTML. This process converts SCSS/LESS -> CSS for your browser to render.
You can use Webpack, Grunt, Gulp, or even desktop/GUI tools to do this.
You can also use a javascript parser to inject the final CSS into the page onLoad but this has performance implications and IS NOT recommended.

Where should I use CSS preprocessors and where should I use style scoped? [closed]

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Vue.js support encapsulation of CSS to .vue files with the <style scoped> directive. I can't understand where I should use it, and where it's better to use CSS preprocessors like Stylus.
My idea that should be site.css with global styles and every single .vue files should have own styles (like colors of elements and other minor stuff). Am I right?
It's not "either / or". You don't have to choose, the two features do different things and can be combined.
A Preprocessor like SCSS lets your write CSS with additional syntax features, like variables. This makes writing CSS easier. But in the end, you get normal CSS, and the selector rules come out with the same names as you wrote them.
The scoped feature does something very different: it takes the CSS (after the preprocessor has processed it) and adds a unique attribute selector to all rules and an attribute to all elements in your template. That makes this CSS work only for elements in this component.
Why is this useful? Because it prevents unwanted side-effects. You can write easy class names like "header" in your (S)CSS without having to worry about that maybe, some other component also uses this class name for something different and the style rules might conflict and overwrite each other. That cannot happen with scoped.
More info on that feature here:
http://vue-loader.vuejs.org/en/features/scoped-css.html
You are in the right path. There is no right answer here. I tend to create a base.styl or base.scss that I then import in app.vue. I personally do not use scoped but more a modular css approach for the styles specific inside vue component files. i.e. .componentname as your root class, and then write your styles according to smacss or bem approach.
I suggest you keep consistency with the same css preprocessor across all components of your app.

Writing rules with one class in CSS [closed]

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I have a question to web designers - do you think that it's fine to make CSS classes with one rule in them?
For example, I usually write classes like .float-right, .center or margin-top-40 to apply them to divs or some other elements. But I must say that I'm not writing all CSS this way, just applying these classes in some places when it's necessary to remain flexibility, like when I have to move one link to the right or something like that.
Do you think that it's the correct way of using CSS?
My suggestion is to create a base file which will include a lot of classes with one rule.
And in a different css file, you will use Sass with #extend to build your component css classes.
For example:
.foo {
color: red;
}
.bar {
#extend .foo;
}
For the examples you have mentioned, it is not necessary to write additional class for the particular style. You can write them where necessary.
Adding additional style rule adds extra class in the html markup.
You can use #mixin in SCSS which will be more efficient.

Modify Bootstrap files or Write on top of it [closed]

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I'm using Bootstrap 3. Ok no problem so far, but, there's a but...I don't know what is the right approach when it comes to alter bootstraps's core css code. So for instance I want to design a new theme, let's say for my own site, and I want to do that using Bootstrap 3, but when it comes to prettiness bootstrap it's like a 3-4 out of 10.
Should I tweak bootstrap files with my own css styling OR Should I build on top of bootstrap and, well, having unused css properties in bootstrap file that I overwrite in my own "style.css".
And I'm not talking about Bootstrap Customize option on site. There are not so many things I could change.
Definitely build on top of Bootstrap, create a new css file. It is better not to touch bootstrap at all, and have it act as it is intended when you need it to.
You can use Customize to add/remove components desired and customize Less variables to define colors, sizes and more inside your custom CSS stylesheets. Bootstrap's customizer finally will generate your csutom javascript & style files with desired components.
If you use css preprocessors like LESS or Sass you can do it by changing variables' values in your editor. Bootstrap's default preprocessor is LESS, but there is also available Sass version.

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